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тАО09-25-2008 11:18 AM
тАО09-25-2008 11:18 AM
Group,
I have a va7410 with 67 luns ranging in size from 10gb to 100gb.
This array is connected to a hard partitioned rp7420 (effectively two systems).
All disks are at the default queue depth for HPUX 11.11, is there some way to figure if I need to change the scsi queue depth and if so to what?
I know this relates to the number of luns, number of host ports (in this case 4), etc...but I'm not sure about the calculation or if I need to apply whatever I come up with to all disks.
Further info, running several different databases on the two systems (oracle).
thanks,
c
I have a va7410 with 67 luns ranging in size from 10gb to 100gb.
This array is connected to a hard partitioned rp7420 (effectively two systems).
All disks are at the default queue depth for HPUX 11.11, is there some way to figure if I need to change the scsi queue depth and if so to what?
I know this relates to the number of luns, number of host ports (in this case 4), etc...but I'm not sure about the calculation or if I need to apply whatever I come up with to all disks.
Further info, running several different databases on the two systems (oracle).
thanks,
c
Solved! Go to Solution.
2 REPLIES 2
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тАО09-26-2008 10:17 AM
тАО09-26-2008 10:17 AM
Solution
Hi Charles,
Normally the QFT is set to 750.If you have been seeing QFull messages then you could consider altering them:
Here is a formula that yields Best results:
2 or 3*(#disks in RG)/(#ports in RG)
PS: There isn't a mandatory rule as such.
For HP-UX, you need to have PHKL_29047 to avoid host performance issues when the host gets the Queue Full message from the array.
Cheers!
Shiva
Normally the QFT is set to 750.If you have been seeing QFull messages then you could consider altering them:
Here is a formula that yields Best results:
2 or 3*(#disks in RG)/(#ports in RG)
PS: There isn't a mandatory rule as such.
For HP-UX, you need to have PHKL_29047 to avoid host performance issues when the host gets the Queue Full message from the array.
Cheers!
Shiva
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тАО09-26-2008 10:54 AM
тАО09-26-2008 10:54 AM
Re: va7410 optimum queue depth for luns
We're not getting any errors, but I'm just concerned that I'm not getting the best perf out of the array.
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