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I have a KVM host server running Ubuntu 12.04 LTS, bare bones installation with only KVM installed. The server has an 8 Core Intel(R) Xeon(R) CPU E3-1230 V2 @ 3.30GHz CPU with 32GB of RAM and SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05). There are two physical disks installed in a mdraid 1. I am using LVM partitions for /, /var, swap.

I am seeking advice on optimizing the disk performance of my KVM guests on this host configuration. My guests are running Ubuntu 12.04 LTS. One guest runs a CrashPlan PROe Master (not storage) Server (http://www.crashplan.com/enterprise/). CrashPlan PROe Server uses a database that is being read/written fairly intensively with our CrashPlan topology and load. As such, log reviews are indicating that transactions are waiting resulting in degraded performance.

My current guest parameters include:

  • Storage Format: RAW
  • Disk Bus: SATA
  • Cache Mode: None
  • IO Mode: Default
  • Memory Allocation: 8192 MB
  • CPU Allocation: 4

Can anyone suggest best practices to host or guest configuration to optimize performance of KVM guests disk IO performance particularly for random read/write (database)?

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I think this previous answer hits the high points. My feeling is you probably need more spindles or even SSD. –  Michael Hampton Apr 9 '14 at 1:30

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