Vmware lun size limit The maximum supported LUN size in SnapMirror configurations (both synchronous and asynchronous) is increased from 16 TB to 128 For an up-to-date list, see VMware Compatibility Guide. The limits presented in the following sections represent When setting up storage for ESXi systems, before creating VMFS datastores, you must decide on the size and number of LUNs to provision. Created a LUN of size 3t (3298740318720) Here I'm Supported limits reflect the current state of system testing by Red Hat and its partners for mainstream hardware. Dell Support Resources. You can also create physical raw device mappings over 2 TB should a VM need a This may be an option with other hypervisors, but this is a hard limit for vSphere today. We are planning to convert our last "traditional" server to another ESXi host. Then the VMWare admins span across them to create a single ~62TB datastore. This is not recomended though. From vSphere 8. 9 Dell EMC Unity: VMware vSphere Best Practices | H16319. With ESXi 5 the LUN size is not limited to 2 TB anymore so you won't have any trouble adding the 5. I'm used to NetApp/Solidfire and the LUN size limit is dependent on the ONTAP or Element OS version or even the model of chassis, ect. For example, 444Gb I would round up to 500Gb, 689Gb I would round up to 750Gb and so. 0). This step is vendor-specific. 1, the best practice was to keep LUN sizes smaller than 2TB (i. To ensure that the host recognizes LUNs at startup time, configure all iSCSI storage targets so that your host can access them and use them. Assuming Fibre Channel Can Vmware ESXI use internal Disk larger than 4TB yet? Spiceworks Community VMware ESXI HDD size limit. supported file size is still ~62TB (maybe less, depending on the storage system's capabilities). 0. The newly created disk names in a VM are: vmname_number-number. The limits presented in the following sections represent tested, recommended limits, and are fully supported by VMware. I am interested to hear your thoughts, advice and recommendations around this. Using the vSphere Client, you create a VMFS datastore on the thin-provisioned LUN. It is important to know what block size your SAN uses based on the provision amount and set VMware to use the same block size when writing data to ensure optimal performance. VMware vSphere VMFS Introduction This section covers the introduction of VMware vSphere VMFS. Each datastore has a unique performance. 2 7-Mode From the default sizes you can see that each VM is able to issue 32 concurrent I/O requests, the adapter queue beneath it is generally quite large and can normally accept all those I/O requests, but the LUN queue beneath that typically only has a size of 32 itself. g. Marcelo Soares. My intention was to create 1 large LUN but I just found out there is a 16TB max limit for LUNs. 1 has also the 256 VMFS volumes per host limit, so yes, 256 datastores is the limit at the moment. 0 Storage Features Part 1 - VMFS-5. 5 are limited to VMDKs smaller than 2 TB. 1 over TCP/IP. Vsphere 5 has the 2TB datastore and the file size limit increased. ESXi does not support iSCSI-connected tape Our setup is FC SAN, with various storages (netapp, hitachi, emc -- yes, we are consolidating). Having too much guests running over one LUN might lead to decreased performance. Series (link provided below), Table 4 lists out all the capacity limits for the various VNXe models. I think it has to do with how ESX addresses (CHS) SCSI disks, just because the maximum is 2TB-512Byte doesn't mean it will always work up until this size on a LUN of a larger size. Aggregates. Maximum LUN size = 64TB. One of the primary objectives of Storage enhancements in 5. VMFS datastores can be up to 64TB in size and consist of up to 32 2TB LUNs (VMFS 3) or a single 64TB LUN (VMFS 5). The View Limits tab provides the information of configuration maximum limits of the selected vmware products for a specific version. The limits presented in the following sections represent For general purpose VMs, prior to vSphere 4. For example, Windows has a hard limit based on the version (16TB I think). iSCSI Storage Restrictions. 28 Posts. 3. Maximum size for VMware can be 16TB" One of my customers wants to add large RDMs to their virtual machines, and I'm trying to work out the maximum supported size for the lun on the array. In one of the sessions at VMworld, someone asked when this was going to be addressed. Pooling and distributed resource scheduling for compute, storage and network helps but at the end there is always a physical host, LUN or network uplink which constraints the granularity of scaling. However, it also depends on the workload of the VMs and whether you do a backup with snapshots. The RDM pointer file does not need to be stored on the same datastore the confguration files or other vmdk files, e. All Events; I have a vmfs in 1mb size (limit to 256gb). If we know your server make, model and RAID card and ESXi version we can help you clarify Our current LUN sizes are 2TB which leads to alot of wasted space. And to put the cherry on top, take your calculated LUN size and round it up to the next “handy†number. Although there are two Flexibility: While larger datastores reduce the total number of LUNs, they can also limit flexibility in distributing workloads, especially if many VMs have differing storage needs. Maximum vmdk = 2TB. 5, the maximum virtual disk size is 2TB minus 512 Bytes. NetApp generally recommends using a single, large LUN for each datastore. You should check with your SAN manfacturer or VAR for guidance on sizing restrictions with VMware. The RP limit is 32TB for a lun not 2TB assuming you are using one of the array based spitters. VMFS-5 limits the number of extents to 32 and the total datastore size to 64TB, but the individual extents are not limited to 2TB each. I'm looking forward to being relatively early in adopting 9. A VMFS extent is a kind of partition that spans multiple LUNs. 1 was introduced in vSphere 6. 7 vC 6. vCenter Server Maximums vC 8. VMWare ESXi supports two ways of expanding VMFS datastores: by using unused space on the same LUN (we are describing this method in this article) or by adding additional LUN (the method is called an extent). You under estimated? No problem, adjust the size, then have the OS expand mount point to fit the new space - online, no reboot, no pain. Was wondering what sizes the community is using? Any concerns with going even larger? Capacity: LUN size must be at least 1 GB. RE: RDM LUN Size. the 2TB less 512b limit for file size still applies though. Maximum vmdk = 2 TB. vSphere 5 took the LUN size limit from 2 TB to 64TB. All Blogs; Enterprise Software; Mainframe Software; Symantec Enterprise; VMware; Events. This is documented in kb 3371739, and interestingly enough seems to support that the config max document may have a mistake with regard to LUN size. We can assume that the 64tb limit is just a recommendation. With an array of more than 2 TB you can create several LUNs on it. Unfortunately I never had the chance to really examine how the size was possible in the first place - after I recovered the data we purged everything and had to rebuild from scratch as with ESXi prior to version 5 and it's VMFS 5 file system, the maximum LUN/disk size is limited to ~2TB. It comes, because esx formats volumes using max block size of 8MB. n Chapter 2, “Virtual Machine Maximums,” on page 9 n Chapter 3, LUN size 64 TB LUN ID 0 to 16383 Number of paths to a LUN 32 Number of total paths on a server 2048 Number of HBAs of any type 8 HBA ports 16 Title: Performance Best Practices for VMware vSphere 7. VMware is not mentioned here, but it will be useful for you to have 5 or 10 virtual machines in a datastore. There has never really been a recommended LUN size persay, it was always that 500GB is a nice number, your LUN sizes should be driven by your needs. In these cases it was typically one or only a few VM’s accessing the large datastore/LUN. VMFS5 and VMFS6. Snapshot file that represents the difference between the current state of the virtual For VMware it is a limit of request that can be open on a storage port at any one time. Can I have an RDM LUN Physical or Virtual larger then 256GB connected to a vm on the vmfs with 1mb block size? Thanks . Locks only required parts of a LUN when a VMware ESXi host accesses data on it, allowing multiple VMware ESXi hosts to access the same LUNs simultaneously without compromising the performance. With VMFS5 and the move to GPT, larger than 2TB block devices 2. Question: 1. If you use USB or SD devices to perform an upgrade, the installer attempts to allocate an ESX-OSData region on an available local disk. Created Date: 20210129112442Z The maximum LUN size is generally 128TB beginning with ONTAP 9. There are still some limits to the multipathing and load-balancing approaches that can be taken. For LUNs with legacy advanced features, the size must be at least 10 GB size. I would probably go with 3 or 4 LUNs and present them on the different controllers. ngxstorage. With VAAI and all SSD SAN storage, most of the VMFS sizing limits have been removed. 12. 5 TB as a datastore. When you select and configure your virtual and physical equipment, you must stay at or below the maximums supported by vSphere for both vCenter and ESXi/ESX. Data will be written to the second LUN after the first one is full, etc. If no local disk or datastore is found, /scratch is placed on the RAM disk. Revisions Date Description April 2021 Initial Consider a fiber channel SAN (EMC CLARiiON for example), and the limits around SCSI reservations, queue limits etc. Virtualization. NFS version 3 has been supported since the early days of ESXi. 5 vC 3; Hosts per vCenter Server: 2500: 2500: 2000: 2000: 1000: 1000: 1000 VMware VMFS (Virtual Machine File System) Notably, it raises the extent limit to 64 TB and the file size limit to 62 TB, [2] though vSphere versions earlier than 5. carsondornik2 (carsondornik2) if you mean creating a LUN of larger to support the VMDK. chrisyoung0480 (GranPaGTS) December 11, 2013, 8:35pm 2. Vmware has a 256 LUN limit, would this limit mean you have a 256 datastore limit? besides the LUN limit, vSphere 5. 16Tb limit is a lun limitation only, you can have a 100Tb Volume exported by NFS should you need to. Technical Support Engineer. vmware ESX/ESXi can use LUNs and create volumes and virtual disks up to, but not including, 2 TB or 2048GB (2047GB has worked for me) due to a functional If using multiple LUNs in a single volume you can put the LUNs into policy groups (but not both at the same timeeither the volume, or the LUNs in it). Check in hwu. sometimes we need follow the storage best practices, not only the VMware best practices, and a example storage vendor recommends create array with 8 disk drives and use 01 LUN per Array, then if I create a array with 8 x 2TB disks in RAID10, I will get a array with 8TB, and consequently a volume (LUN) of 8TB then I will prefer create a Created a LUN of size 1t (1099604782080) my-cluster::lun> create -volume my_volume -lun test_lun_2 -size 2199023255552 -ostype windows_2008. Unless you are running all 64-bit Linux or Win 2008 or 2012 servers, there is a addressable file size limit of 2TB. 5. File Description; The base disk names in a VM are: vmname_number. This section provides configuration recommendations and storage access guidelines for integrating VMware vSphere 6. The limits can be affected by other factors, such as hardware dependencies. com, you can see what the max LUN size is for the model / ontap version. Create virtual disks to contain the data for virtual machine applications in the VMFS datastores created on LUNs with the appropriate RAID level for the applications' requirements. 0 Author: VMware, Inc. The max. See VMware KB 2069356 for more The ONTAP tools for VMware vSphere supports the following protocols: NFSv3 and NFSv4. 4,587 Views Mark as New; Bookmark; Subscribe; Mute cause of "Size out of limit. The maximum supported LUN size on AFF and FAS platforms is increased from 16 TB to 128 TB. When it comes to storage it is the datastore size that limits the maximum size of virtual disk a cloud consumer can attach to his/her VM. Created a LUN of size 2t (2198888778240) my-cluster::lun> create -volume my_volume -lun test_lun_3 -size 3298534883328 -ostype windows_2008. In VMFS 3 you can have a 64TB datastore, but this will be made out of extends not bigger than 2TB. 1 vC 5 vC 4. Its been awhile since I've considered VMFS sizing. On what datastore would VMs have greater disk performance? My understanding is that the LUN cannot be larger than the maximum size supported by the datastore the RDM pointer file is created on. I have hundreds of LUNs, my SAN has plenty of free space for provisioning more / expanding to meet new demand, and I have no space worries. The only paths I've seen done under VMware vSphere to achieve 100+TB being visible in the Guest OS is binding disks together or presenting storage directly to the guest (either an iSCSI LUN or RAW disk as mentioned by another resource). 0 is to make the management of storage much In high-performance environments or when testing performance with a single LUN datastore, consider changing the load balance setting of the round-robin (VMW_PSP_RR) path selection policy (PSP) from the default IOPS setting of 1000 to a value of 1. (In NetApp, LUNs are stored inside a special "file" which in-turn is stored inside the WAFL filesystem, and so are subject to this limit] This looks like a former VMFS-3 volume. vmdk and vmname_number-flat. Select the guide appropriate for your version: Prior to vSphere 5. While there can be performance benefits for high In addition, vmdk size is limited to 2TB - 512B, too, beacause of VMFS file size limit, which is 2TB - 512B. For general purpose VMs, prior to vSphere 4. For example, if you create a 100 GB LUN, you can only grow it to 1,000 GB. netapp. vmdk or vmname_number-number-delta. I agree that size is not problem, you should rather care about number of VMs running from one datastore and consider their workload than datastore size. It allows vSphere host to have VMs that are able to share disk resources and make having multiple VMDKs per LUN possible. VMware vSphere® VMFS is a high-performance cluster file system (CFS) that enables virtualization to scale beyond the boundaries A refresh in vCenter on each cluster node also shows the LUN now as 1. After creating a single aggregate with all 12 disks, it doesn't let me create a 20 TB LUN with VMware as host type, cause of "Size out of limit. If you use vMotion to migrate virtual machines with RDMs, make sure to maintain consistent LUN IDs for RDMs across all participating ESXi hosts. IMHO, it makes 64TB (- 16K :smileyhappy: Volume Size useless, because it is not possible to place large vmdk files (over 2TB). All LUNs and VOLUMEs are mapped to virtual environment (VMware) NetApp Release 8. However, after you have increased the size, you must rescan the NGX STORAGE VMware vSphere Best Practices Technical White Paper March 2022 Vers 1. The new vSphere 5 sizes are going to make things interesting for enterprise SAN’s where you are carving your datastore luns from a dedicated-to-vmware-cluster disk pool. 2 Disk Pools (2 x RAID5 @ 3 Disks/RAID5) 3. VMFS 5 = vSphere 5. I'll have a look at the documentation as soon as I can and see what it says, and see if it's any different to the VMware limits site. Assumptions: 1. @VMware. Be aware to align the partitions correct or you will suffer from performance degradation. Thats an ESX limit. 3 and added recently a DS4246 shelf with 12x 4TB disks. The only reason I can see to make luns smaller than the limit of 64TB is to spread the load onto additional controller processors. In ONTAP 9. VMWare Certified Professional 310/410. If you need to create snapshots the maximum virtual disk size 2,032GB due to the metadata overhead in the snapshot file. vMotion and VMware DRS When you use vCenter Server and vMotion or DRS, make sure that the LUNs for the virtual machines are provisioned to all ESXi hosts. Because virtualized workloads are mobile, you can explore different approaches using Storage vMotion to move VMs across VMFS, NFS, or vVols For a long time VMware’s max LUN size was 2TB. As the vSAN design and sizing guide explains, large VMDKs (vSAN objects) will be “chunked” out into many smaller components based on a maximum component size of 255GB. At present, maximum LUN size remain 16 TB. 999 TB. x hosts with the Dell EMC Unity All-Flash array models. 5 vC 5. I'm not aware of any Best Practice for datastore sizing. We are using Symmetrix with the latest 5875 code and Fast pools. Should I limit the number of LUNs? Windows Server does impose limits on the number of LUNs it can recognize, but the limits are large enough that they should not normally be an issue. Maximum Boot LUN size (BIOS) 2TB 15: 2TB 15: 2TB: 2TB: Maximum Boot LUN size (UEFI) 32bit Host configuration 6 Dell PowerStore: VMware vSphere Best Practices Term Definition NVMe over TCP (NVMe/TCP) Allows hosts to access storage systems across a network fabric with the NVMe protocol using TCP as the underlying transport. Our SAN can do 16TB LUNS (if i read the documentation correctly) Should I set up the biggest LUNS possible or should we stick with smaller ones?Or should we do something in the middle like 8TB Best size for creating LUNS for VMware ESXi 5. Your documentation should state the maximum LUN size you're allowed to create as well as what Windows will support. In a larger ONTAP cluster, it is possible to reach the path limit before the LUN limit. When you select and configure your virtual and physical equipment, you must stay at or below the maximums supported by vSphere 6. per LUN. 1P2 (and earlier with ASA systems); therefore, a maximum-size VMFS 5 or 6 datastore of 64TB can be created by using a single LUN. [4] VMFS6 is used by vSphere 6. The datastore spans the entire logical size that the LUN reports. The limits can be affected by other factors, such as When you select and configure your virtual and physical equipment, you must stay at or below the maximums supported by vSphere 6. You may configure the MSA with the LUN sizes you mentioned. The Maximum iSCSI Virtual Disk / LUNs Size Max = 1. Using ONTAP together with vSphere is a great combination that lets you reduce host hardware and VMware software expenses. Maximum size for VMware can be 16TB" Is this the maximum supported LUN size or am I doing Hello, we have a customer with a FAS8020 storage, ONTAP 9. To address this limitation, ONTAP supports selective LUN VMware vSphere considerations . VMFS allows LUNs to be accessed simultaneously by every ESX server in a cluster. 1 Fibre Channel switch zoning The LUNs are defined on the Clariion as 2048gb in size. 290 were too small for my environment with some of the SQL boxes (I do think like having 1 vm with disks on 4 different LUNs). 999 TB for the VNXe3100 RDMs require the mapped device to be a whole LUN. 4 LUNS (2 LUNs/Disk Pool) 4. 0 vC 3. A datastore is used for /scratch, if no space is available. reedic. You can also protect your data at lower cost with consistent high performance. Just found out there is a 16TB size limit on LUNs. ESXi Disk/LUN size limit sim0 Oct 16, 2009 07:39 AM. The 738GB you see is most likley due to an overflow at 2 TB (2. I've re-scanned the disks in the Windows 2008 VM, and it shows the extra 100GB available, so I assume I can extend the volume into the free space, but this will push the volume size up to 2036GB. LUN size for VMFS datastores and physical raw devices in ESXi 5 is ~64TB. 2 Always check support. 0 release, NVMe/FC protocol is supported for vVol datastores. If you have VMware max LUN size gavan ‎2018-08-23 07:21 AM. This means that if a LUN is shared by multiple virtual machines the LUN queue The maximum size of a legacy virtual hard disk file (VHD file) is 2,040 GB (not quite 2 TB). What are you guys doing with regards to the number of VMs you are placing per a LUN? How about the max sizes of your LUNs (in vSphere 5. The virtual machine maximums represent limits applicable to compute, memory, storage virtual adapters and devices, network virtual devices, virtual LUN number. It's a a Lance between performance and size. The ONTAP maximum LUN size is 128TB on AFF, ASA, and FAS systems. e. We are currently moving from 20TB Pure SAN LUNs to 40TB. 4TB sized luns were selected as it is maximum for hitachi live migration. There is a The limits presented in the following sections represent tested, recommended limits, and are fully supported by VMware. 2. 999 TB Limit remains the same in You may wish to use NFS as the VMware NFS datastore size Max = 15. 5, you have to use the Web client to do anything with larger VMs and VMDKs. You can experiment using the For VMFS datastores, the maximum supported size is 64TB, with a maximum file size of ~62TB. Parent topic: About Raw Device Mapping VMware supports both NFS version 3 and NFS version 4. I have built and designed systems with larger and smaller LUN sizes. Memory Sizing 33 Memory Overcommit Techniques 33 Memory Page Sharing 34 Pages 37 Persistent Memory (PMem) 38 ESXi Storage Considerations 39 VMware vStorage APIs for Array Integration (VAAI) 39 LUN Access Methods 39 Virtual Disk Modes 39 Virtual Disk Types 40 VMware welcomes your suggestions for improving our documentation. However you really should have all LUNs connected to all ESX servers in a cluster (VMware best practice) otherwise it can become very confusing to try to move VMs around using VMotion as you will have hosts certain VMs can't get to. Check how many guests and virtual disks you'll have and spread them acroos all LUN's with a reasonable size. 4 and earlier, you can only grow your LUN to approximately 10 times its original size, but not greater than 16 TB. We decided on 3TB. This 16-20 Limit is based on OLD theories which no longer apply, Anton and I both have proven them false, and its going off of LUN sizes that are smaller than we have today, because of DISK size. This restriction was not a big issue to many but some wanted larger LUN sizes because of an application requirement. The maximum size of a VHDX file is 16 TB. Systems exceeding these supported limits may be included in the Hardware Catalog after joint testing between Red Hat and its partners. LUN Size: 500GB/LUN for a toal of 2TB storage. Andre - in the case that I have seen the 73 tb was the real size - not just the provisioned size. ONTAP rounds down the limit to be slightly less. Support for NFS version 4. My understanding is that RDM's have a maximum size limit of 2048gb - so I guess what I want to know is "Does 2048gb = 2048gb" and it's that black and white, or is there any likelyhood of ESX not recognizing the LUN because it's fractionally over or something daft? Recently we decided to increase our Lun sizes for VMware to 4TB from 1TB for our vSphere environment. With VMFS5 no longer having the 2TB limit for a VMFS volume, I'm considering which scenario would be more beneficial overall:-Less LUNs of larger size, or; More LUNs of smaller size. 5 Spice ups. André 3: The BEST part of SAN / iSCSI is immediately available LUN re-sizing. As well as filesize. For example, you can create a datastore with a LUN size of 64TB, or one with up to 32 extents up to maximum size of 64TB. ESXi 5 is still limited to 2 TB for virtual disks. 0 vC 6. The maximum iSCSI LUN size is 1. vmware, discussion. 73TB modulo 2TB). We don’t really concern ourselves with size limits themselves on LUNs, but rather what the impact of large LUNs is on our backup and replication The limits presented in the following sections represent tested, recommended limits, and are fully supported by VMware. The limits presented in the Configuration Maximum Guides represent tested, recommended limits, and they are fully supported by VMware. I have populated all drive slots and created 1 aggregate. When you make your LUN decision, the following considerations apply: Each LUN must have the correct RAID level and storage characteristic for the applications running in Unfortunately I cannot find the confirmation that a storage system can present to vSphere a LUN bigger than 16TB so that I could create the big VMFS volume. 1 Recommend. It provides insights on the functionalities and capabilities of VMFS and how it works benefiting the organization. Maximum RDM virtual mode = Create multiple LUNs and use VMware Extents it appears is the answer you seek. Am I correct in understanding that there is no way to set up a datastore larger than 2TB - 512B or have a RDM disk larger than 2TB - 512B or have a VM use a VMDK larger than 30 x (your average disk size) + 30Gb VM swap + 15% of (30 x your average disk size) = calculated LUN size. 512B limitation on VMware storage. The more luns you have, the better performance you will get by separation of the load but management gets to be difficult if you have 30 1 TB LUNs. You do not need to take the LUN offline to increase the size. even though ESX supports 2TB LUNs, don’t make them that big). vmdk , vmname_number-number-sesparse. But beyond that and with vSphere 5. I do not use snapshots and thinprovisioning. vmdk. 99TB, so knowing the 2TB per LUN limit, I should be ok. . Therefore, a maximum size VMFS datastore of 64 terabytes is created by spanning across 4 separate 16 terabytes LUNs. 0 vC 5. For NFS Mounts, it's basically the storage system which limits the datastore size, but the max. Best Practices Hello, I have several LUNs and VOLUMEs associated with these LUNs but I still do not understand why total space of VOL is different than total space of LUN. ONTAP tools supports provisioning of VMFS5 and VMFS6 datastores up to the maximum VMFS LUN and volume size of 64TB When used with all ASA systems running Every LUN means another I/O queue. Maximum RDM = 2 TB. Maximum LUN size is 2TB-512Bytes, but you can combine 32 LUNs to create a 64TB-16Kbytes datastore. 3 . Larger RG sizes means less capacity penalty for RAID-DP, but also increases risk due to multiple disk failures. Cancel Post. The Compare Limits tab enables you to compare the configuration maximums imits between two versions of the same VMware products. Maximum LUN size of 2 TB as of VMFS3 [6] Provision several LUNs with different storage characteristics. Balance RAID group size for capacity vs risk. Configure your environment to have only one VMFS datastore for each LUN. 3 VMware vSphere considerations . If SAN is required, the ONTAP maximum LUN size is 16 terabytes. The block size impacts the maximum capacity of the datastore under the legacy VMFS-3 format. 0 vC 7. Usually more that one, but not too much It is also related by LUN size and how storage works (it works with RAID group or with a "global" RAID splitted on all disks) For LUNs that are shared among multiple hosts, make sure that LUN IDs are consistent across all hosts. This action provides the most ability to move virtual machines. What is the maximum LUN size in vmfs3 and vmfs5 ? VMFS 3 = vsphere 4. Only pass-through RDMs (Raw Device Mapping) can be created with a size >2TB. Create a VMFS datastore on each LUN, labeling each datastore according to its characteristics. It basically depends on your infrastructure, the Using storage-specific tools, your storage administrator provisions a thin LUN and sets a soft threshold limit that, when reached, triggers an alert. If you found this or any other answer useful please consider the use of the Helpful or correct buttons to award points LUN size limit. PSP) from the default IOPS setting of 1000 to a value of 1. In my case, I have a new 24-disk storage array with 600GB disks. Having too many virtual machines in a datastore will negatively affect performance. After the upgrade, reconfigure /scratch to use a persistent datastore or add a new disk for system I have a few quick questions regarding VMFS datastores and SAN LUN best practices. The limit is around the fact that VMware ESX and ESXi uses the SCSI-2 standard. Some SAN will change the disk block size when the LUN is sized over 500GB. Maximum Lun size = 2 TB. A single 62TB VMDK with NumberOfFailuresToTolerate= 1 will require 500 or so components in the cluster (though many of these components can reside on the same physical devices). 10 times the original LUN size, but not greater than 16TB, which is the maximum LUN size. 1 vC 4. Diagnostics and Tools; Drivers and Downloads; Any SCSI LUN, be it local attached SATA/SAS, FC, iSCSI or whatever must not be larger than 2TB-512Byte period. VMware {code} VMware Cloud Foundation; Blogs. discussion LUNs can have millions of files, Volumes can have millions of FILES, why all of a sudden can you only have 30 files or less on VMFS makes ZERO sense. iSCSI SAN (Single Storage Processor) 2. 1. It is a hardware dependent setting on the HBA or iSCSI initiator (software or hardware) that sets a limit on the queue depth. 5 vC 6. com for the latest version of the document. You might like to read here: VMware vSphere Blog – 12 Jul 11 vSphere 5. In addition to this, it's generally not possible to increase the size of the local VMFS datastore (the one on the installation disk) from the GUI. Which means you'll use 32 2TB LUNs for 1 datastore. you could have moved the RDM pointer file to a datastore with a larger blocksize and left the vmx file and You can only even have 255 LUN mounted to any given ESX server. tfjsnvk otuxw rzpqwy twxs mlvr oedm pbq omouzw wpmdghk yctnbd