synsoc
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Queued IO in powerpath clarification

Hello,

I had a quick questions on the Q-IO value seen in powerpath.  Is this value the number of IO's that are queued above the HBA queue depth?  In the example below, do the 16 and 18 queued io's suggest that I need to increase my hba queue depth, or are they just in transit to the frame, and as long as they are under the hba depth we are fine?  Thanks!

Symmetrix logical device count=36
CLARiiON logical device count=0
Hitachi logical device count=0
Invista logical device count=0
HP xp logical device count=0
Ess logical device count=0
HP HSx logical device count=0
==============================================================================
----- Host Bus Adapters ---------  ------ I/O Paths -----  ------ Stats ------
###  HW Path                       Summary   Total   Dead  IO/Sec Q-IOs Errors
==============================================================================
   0 fscsi0                        optimal      36      0     944    16      0
   1 fscsi1                        optimal      36      0    1020    18      0

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3 Replies
SKT2
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Re: Queued IO in powerpath clarification

which OS?

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synsoc
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Re: Queued IO in powerpath clarification

AIX 5.3.  2 x IBM 5773 4Gb with depth currently set to 16

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HankD1
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Re: Queued IO in powerpath clarification

I don't know about the depth setting for AIX but 34 queued IO/s doesn't seem that high, you're under 2% queued. Some performance guys will tell you if you're not queuing you're not utilizing your environment.

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