The purchase of new hosts

We are looking for information about the performance of the host using different types of RAID.

RAID 1 or RAID 5 substantially affects the performance of the host in the following conditions?

  • Home discs are used for the ESX operating system and the storage of ISO files for quick access from the vSphere client to install on virtual machines.
  • All virtual machines are stored on SAN storage and not locally on hosts.
  • All data are stored in raw mapped LUNS and not locally on hosts.
  • VirtualCenter is used.

The whole reason for this question revolves around having more hosting disk space available for the use of the ISO without performance impact storage.

Yes, we know the mirroring is "faster" than striping.  We just want to know if anyone has experience with how it affects the performance of the host.

Thank you for your comments and suggestions.

It is difficult to generalize.  This will depend on your application profile of IO, as well as your matrix of underlying disks.  Storage vendors have ways to get around any IO penalty incurred by the use of various flavors of RAID.  Your application will determine how many and what type of IO you do, which will require a certain basic performance of the disc to satisfactory performance for you.  The big question is how much IO looking to make?  You can take the matrix of underlying disks and figure out how much IO, you can get out your disk subsystem, and which may or may not be enough for what you want it to do.

Using vcenter won't make a difference or on the RAID type that you use.

The question you need to ask, is how muc I/O you wait, and then you can figure out if your underlying system can handle it or not.

-KjB

Tags: VMware

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