On 01/03/2021 09:08, Luis Bolinches wrote:
Hi
>
There other reasons to have more than 1. It is management of those. When
you have to add or remove NSDs of a FS having more than 1 makes it
possible to empty some space and manage those in and out. Manually but
possible. If you have one big NSD or even 1 per enclosure it might
difficult or even not possible depending the number of enclosures and FS
utilization.
>
Starting some ESS version (not DSS, cant comment on that) that I do not
recall but in the last 6 months, we have change the default (for those
that use the default) to 4 NSDs per enclosure for ESS 5000. There is no
impact on performance either way on ESS, we tested it. But management of
those on the long run should be easier.
Question how does one create a none default number of vdisks per
enclosure then?
I tried creating a stanza file and then doing mmcrvdisk but it was not
happy, presumably because of the "new style" recovery group management
mmcrvdisk: [E] This command is not supported by recovery groups under
management of mmvdisk.
JAB.
--
Jonathan A. Buzzard Tel: +44141-5483420
HPC System Administrator, ARCHIE-WeSt.
University of Strathclyde, John Anderson Building, Glasgow. G4 0NG
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