This post is more than 5 years old
19 Posts
0
1615
November 26th, 2013 19:00
find STD dev with high latency using symstat or SPA
We have very high DA utilization on a number of directors but not all and so it makes us think it is not likely TDEV's but STD dev's which are carved out of certain Raid Groups. I see nowhere in SPA that allows me to sort/search by Devices if I don't know the specific SG. I do know a DA but no mention of STD device beneath it. How does one approach this?
1 or more STD devs (possibly R6 or R1) of unknown dev ID, believed to be used by 1 or more SG. The only symptom is 90+% utilization on some DA's. Appreciated!
No Events found!
rawstorage
3 Apprentice
•
423 Posts
0
November 27th, 2013 01:00
Marie,
i'm not sure if you are in SPA for SMAS or Unisphere, but in either you should be able to drill down into the DA's that are showing busy in the diagnostic view and sort the physical disks by activity. When you find the busy disks you should then be able to double click and drill into to find out the busy volumes, TDAT or Regular device. This should hopefully get you on the right path to finding your culprit.
Quincy561
1.3K Posts
1
November 27th, 2013 06:00
The subject of this thread talks about high latency, then goes off to DA utilization. The two may have nothing to do with one another. Is it read or write latency you are concerned about?
What code are you running? in 5876.229 you may see high DA % busy, but much of that could be background activity.
Quincy561
1.3K Posts
1
November 27th, 2013 08:00
FAST VP movement, IVTOC, Clone copy, rebuild, etc.
pajamasmarie
19 Posts
0
November 27th, 2013 08:00
I'm in Unisphere. I'm able to drill into the disk then device. This helps. Still amazed there's not a more elegant method in Unisphere. I thought I recalled SMAS SPA being easier to locate a hot dev. The other method I've heard is to add *all STD devs to a Device Group but that's too tedious in this case. Would be multiple groups, etc. This abaility to drill through the disk to dev helps. Thanks!
pajamasmarie
19 Posts
0
November 27th, 2013 08:00
5876.229.145. What type of specific activities would be on your list of Background Activities?