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8.4

Storage Array Perfomance Stats Advice IOPS

Asked by felixresources in Hard Drives & Storage, Storage Technology

Tags: MD3000 Storage Performance

Hi,

I need some advice on some stats I have pulled from our Dell MD3000i iSCSI storage array.

I ran the stats export over about 30 minutes or so and am not sure is the levels are ok or not. They seem ok. Im not great with IOPS.

I have a LUN consisting of 4 x 15K SAS disks. This LUN is being shared by 2 x ESX4 hosts, and houses 6 Virtual Machines which consist of 2 Citrix, 1 Web, 1 App and 2 other idle servers.

None of these servers are heavily utilized. Maybe 10 concurrent citrix users per server.

Form the stats, it looks like IOPS on this particular LUN average around 20-40 and only rarely spike above 50 and on very rare occasion,  hit 400 IOPS.

KB/sec averages around 200-300KB with the odd spike towards 900KB and occasional 12000KB/sec spike.

Am I correct in calculating 4 x 15K SAS in RAID5 with an average of 180 IOPS would give me 720 max IOPS? and that im waaaaay off having to worry about IO perfomance on this disk?
and I'm likely to hit a iSCSI \ Network bottle neck before IO?

[+][-]10/22/09 02:28 AM, ID: 25632159Accepted Solution

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About this solution

Zones: Hard Drives & Storage, Storage Technology
Tags: MD3000 Storage Performance
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Solution Provided By: BigSchmuh
Participating Experts: 2
Solution Grade: B
 
[+][-]10/21/09 09:32 PM, ID: 25630827Expert Comment

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