Can some one let me know how can i pull the ldev information associated with particular particular groups. I have few paritity groups which are showing continuous busy, so i wanted have the list of ldevs which are part of that parity group.
Do you use Hitachi Command suite or tuning manager?
When you say LDEV, I'm assuming you are using Dynamic pool configuration with virtual LDEVs.
So, you are concerned abt virtual LDEVs. Virtual LDEVs can have pages across whole pool in multiple Parity groups.
The best thing to do is, if you have HTnM, use performance reporter and try to find Top 10 LDEVs which are showing highest no. of IOPS and poor response time.
If you do not use HTnM, you have to export the performance data from array and ask HDS to tell you the most busy LDEVs in a particular pool.
If anybody has any more suggestions, please share.
Hope it helps. Thanks.
If you have Hitachi command suite, you can export the configuration details in .csv type and load it in excel. It will give you the details of LDEV association with parity groups.
And to find out why the particular luns are very busy, you have to dig deeper in the configuration from end-to-end.
those are virtual LDEVs in a pool and can have pages allocated from multiple Parity groups underneath.
If some PGs are very busy, there must be some virtual LDEVs in that pool which are keeping them busy.
as far as I know, there is no method we can find that information. No metric or parameter in performance reporter.
However, if you can find top 10 LDEVs in that pool, which are most busy, you can migrate them online to some other pool which has lesser busy PG / Pool LDEVs.
or add some more PGs of same tier in that busy pool. It will allow pool to rebalance the existing written pages.
I hope that will solve your problem. Hope it helps.
Hi Sandeep and Kamalrajan,
Thanks for the quick response. i am using both command suite and tuning manager, if we export configuration ldevInfo.csv file will not provide parity group information for DP volumes. it will provide us only pool volumes and their associated Parity group details.
Yes, we can pull top 10 Ldev information from tuning manager. But i am looking for some way whether we can pull the virtual LDV's and their associated parity group information.
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