Request for documentation of design of San...

This has been posted a few years back, but it seems that an adequate response was never given. Is there a documentation of the available industry regarding sizing and planning for the san.

"3 SAN sizing - VMware has a range that exceeds not 32 VMs per LUN."

If these are very used then extends over 100 mV per LUN, so virtual machines

are not widely used. It is a very wide range. When sizing the

performance, VMware shall provide the info to back up the above,

that includes what was the LUN RAID level, size of the LUN, disk number by

the LUN, disk speed, proc I/O maximum, etc. so that we know why, is to be

has said. Example, I have a SAN with 1.3 TB of space - why can't be scratched,

say 28 drives in RAID 10 and have 1 large LUN to accommodate 100 strongly

servers used? What happens if the LUN has been scratched with RAID 4? Simple

Guideline sponsor LUN sizing based on the number of PIN based

RAID levels to evaluate the good design of performance for x number of virtual machines

should not be asking for too much. »

Thanks in advance.

That's the thing about sizing of discs - there is no such thing as a recommendation of mat.

Your sizing LUNS will be more often dependent on the characteristics of I/O you need for the device - IOPS / s, disk throughput, etc.  The number of virtual machines, you can reasonably put on a virtual machine will also be limited by these figures.  What I'm trying to do when my environments of sizing is to determine a PEAK base line (think that request here the worst case scenario - what happens if all VMs apps will go nuts on the disk at the same exact time) IOPS / s (this is usually the biggest bottleneck of disk - physical is a pain here) as the head on an axis can be in one place at the same time), understanding braces how much I need to meet that.  Once I know the number of batteries that my logic unit number has spread throughout, I can watch the overall size of the data store that I'll need.  Keep in mind not only disk sizing here, but also VM snapshots will be whether to use and for how long and also keep in mind the memory allocated to each of the virtual machines to plan for the dimensioning of the .vswp file.  Once I have calibration information, I can watch the split unit size on my storage array, I need to know how much divides satisfy both IO and size needs for the data store, and then create the LUN being mindful of the air RAID.  A rule of thumb that I still use, it's 1 physical pin provides me approximately 150 IOPS / s to work with.  This number is very conservative (and frankly a little old, but I have not looked to drive too deep in the last 3 years).  Also keep in mind that your LUN will share spindles (and so share IOPS / s) with the other LUNs, another activity on the storage Bay must therefore be taken into account during the design process as well.

For example, if I have an environment with 10 applications, each with a peak Ops ES / s 500, I want finally to a LUN that would support 5000 IOPS / s.  In collaboration with my 150 IOPS / s as a rule, I would try to LUN covering 34 pins.  If each of the VMS has been configured with the virtual disks of 50 GB and 4 GB of RAM each, and I knew that the VMs would not have any how snapshots would be growing more than 10% of the size of the original virtual disk, I plan for 550 GB of disk space virtual/snapshot, 40 GB for the .vswp file and some overhead for the files of newspapers , the config and VMFS metadata, etc.  So I would to, say, a 600GB LUN.  At this point, my table of storage can support a LUN covering 34 pins of 600 GB?  It's a Go 17.6 divide size.  A compromise can do based on what you know of your application performance (peak load will happen all at once, or is the worst overall peak lower load?)  which could lead to a larger size of split and the axes less) or what you know of your storage array (split sizes are available more large and smaller than the calculations show - are you going with a split more small and more spindles, wasting available i/o, or do you take the large size of split with fewer pins) (, with the possibility to you of the IOPS / s starving or wasting valuable disk space).

With regard to the maximum number of virtual machines that are placed on a specific data store, you would much more than 32 virtual machines on each, in large part because of the way VMFS file locking is maintained.  Each host locks files in the area of metadata for the VMFS data store.  The locks are updated periodically.  These updates and any other activity to update metadata, causes a lock of all SCSI device be maintained on the disk device.  Above 32 VMs highly used, metadata updates can easily keep the LUN in a locked state, preventing the VM disk i/o to occur.

It is almost impossible to set up a vast document because the recommendations made to your environment are specific to your environment.  Of course, workloads between different stores are similar, but the subtleties of each shop means that any widespread recommendation as "build 500 GB LUN 10 batteries and put 15 VMs on them" would be overkill for 45% of stores to research and would be a disaster of performance for 45%, leaving a small 10% happy environments and a good comfort zone.

Hope that makes some sense and helps.

-jk

Tags: VMware

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