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MSA1500cs Large AvQDep Value

MSA1500cs Large AvQDep Value

Anyone know why every so often a LUN on an MSA1500cs will show a very large AvQDep (queue depth) value?

A "show perf" is included below. Notice LUNs 5, 6, and 7 (especially 7)?

Thanks!

Eric

CLI-1> show perf

Sample interval: 778.2s
Structure version: 101
% CPU utilization: 40%
Command count: 113447
Avg Command Latency: 0.64ms
% Time Active Reqs: 5.6%
Max Outst Cmd Lists: 28
Logical Req Count: 113447
Avg Free Phys Reqs: 1587
Avg Free Log. Reqs: 948
Avg Free Xbuf Sects: 0
Avg Lrgst Avail Xb S: 0
Avg Free CPU DRAM KB: 0
Max DMA Xfer Q Depth: 0
% Time DMA Xfr Stall: 0.0%
Avg Locked Stripes: 0
Avg Stripes Waiting: 0
Avg Completions/Sec: 145.7
Avg Log Req Comp/Sec: 145.7

Logical volume data: (All values in hex except Vol and AvQDep)
Vol LWrites LReads AvQDep CHits CMiss RACount LSectRd LSectWr
0 4615 156D 153 13B8 1B5 0 2D1A5 64DBE
1 61A 32 10 B 27 0 1173 3DCD
2 106A 6B 0 43 28 0 ED3 92F4
3 96A 27 0 A 1D 0 1363 895A
4 40C A 0 0 A 0 1141 40C
5 5961 B71 8664 305 879 0 EC6C 594EB
6 3177 DDC 3305 B0 D2C 0 EF34 422A8
7 3FBF 7A6 134902 639 16D 0 F9C1 24911
8 2725 275 0 25F 16 0 51B9 1D782
9 0 0 0 0 0 0 0 0
10 1484 3B 2 23 18 0 1A5B 111E9
11 10F 38 0 B 2D 0 17A3 10F
12 C 2B 0 C 2F 0 14A3 C
13 427 36 1 16 20 0 B4F 2310
14 575 75 0 C 69 0 BD5 35E4
15 435 24 0 A 1A 0 B23 23AD
5 REPLIES
Srikanth.D
Occasional Advisor

Re: MSA1500cs Large AvQDep Value

Hi Eric, could you please provide us with details of the Setup. The performance can be hindered due to various reasons. Probably the most required data is mapped to Lun7. etc..

Re: MSA1500cs Large AvQDep Value

This MSA1500cs is connected to 4 MSA30's fully-populated with 146GB disks and some 300GB disks.

I attached a "show tech_support" to provide some more details.

There are 4 ESX 3.5 U1 hosts connected to this MSA1500cs.

Eric

Re: MSA1500cs Large AvQDep Value

I forgot to mention that I also did a "clear perf" and "show perf" at the end of that attached "show tech_support" to show that an almost clean show perf has a huge value for these 3 LUNs.

Thanks!

Eric
John Kufrovich
Honored Contributor

Re: MSA1500cs Large AvQDep Value

Erik,
It's a miscalculation bug in cli portion of the code.

jk

Re: MSA1500cs Large AvQDep Value

Thanks John! We'll assume there is nothing to worry about.

Eric