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taz_at_emc
2 Iron

Identify which disks used in a mixed pool for a Thin LUN

Hello Admins,

How do we identify which disks have been used in a Mixed pool when a Thin LUN is created. We have the FAST VP and FAST Cache enabled. I understand a chunk from the pool will be allocated for a LUN but how can we determine from which drive(s) this chunk is carved ?

Thanks

~Taz

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3 Replies
siddhant1
1 Copper

Re: Identify which disks used in a mixed pool for a Thin LUN

We can check it with the help of Sp Collects,

I don't think it is possible to check via Unisphere / CLI,, apart from Sp Collects.

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Rainer_EMC
5 Osmium

Re: Identify which disks used in a mixed pool for a Thin LUN

AFAIK there is no customer command show that

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kelleg
5 Tungsten

Re: Identify which disks used in a mixed pool for a Thin LUN

There is no user way to determine where a particular slice of data is located in the pool. With Auto-tiering, slices are constantly being relocated between the tiers and within the tier (re-balancing). Engineering has some tools that can track the slices down, but they need to run a couple tools on the array to collect that data and if Auto-tiering runs after the collecting, some will have changed. The tools can resolve down to a LUN, but further than that is very difficult.

glen