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Is my storage having performance issue? (see screenshot of hdparm & iostat)

SandMan
SandMan asked
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Last Modified: 2012-09-18
Hi Storage experts,

My vms on Xenserver are very slow on booting up, all of this vm's are hosted on the storage which is QNAP TS809-U RP.

Question is, am I having some storage performance issues with I/O judging from the hdfarm & iostat below?

hdfarm from XenServer to Storage

hdparm output - from Xenserver to QNAP
iostat from the QNAP shell/terminal

iostat within the QNAP shell
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Commented:
Wait times are a little high, queue depth is OK. IOPS and bandwidth look OK in the iostat numbers.

hdparm numbers look a bit ordinary.

How is the storage configured? Is it two 3 disk RAID 5 sets? How many VMs are you running? What are the disk drives?
Commented:
Hi meyersd,

Thanks for your time to reply.
 
But when you say "Wait times are a little high" which part are we talking about on the iostat is it the "wait" column?

We are using Raid 10, The total vms running on all 5 xenserver host are around 13, moslty Xenapp servers.
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Commented:
Hmmm.

Need to check your implementation of iostat. According to man pages, -d and -c are exclusive commands - that is; you run either -d or -c, not both at the same time.

Information is a bit thin on how iostat is implemented in QNAP devices - wait is not a usual value - it sgould be await (average wait)
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Commented:
The Solaris implementation of iostat has wait, and that shows queue depth rather than wait time.

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Commented:
Hi meyersd,

Checking the isotat option see below

IOSTAT Option
So do you think I am having preformance issue with my Storage?

Anyone?
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Commented:
What sort of disks? 2TB SATA?

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Commented:
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