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Meta-head RAID 5 (3+1)
If the bin-file is setup for RAID 5 (3+1) and you only allocate 2 hypers to meta-head (total 3 hypers including the metahead). I would like know what adverse effect could happened?
Quincy561
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January 30th, 2014 11:00
I assume we are talking about traditional devices (thick) and not VP devices (TDEVs or thin).
If thick, your 3 metas will most likely be spread over 12 disks (3 raid groups of 4 disks).
So no adverse effect, except that when and if you start creating a bunch of odd metas, the way they get spread on the backend might not be as optimal as possible.
Metas in a thick environment are best with powers of 2, they will match the backend better that way.
nero_emc
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January 30th, 2014 11:00
What would be distinct between thick RAID 5 (3 +1) 4 hypers vs 3 hypers?
Caveat- Bin file setup for RAID 5 (3+1).
Quincy561
1.3K Posts
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January 30th, 2014 11:00
Typically 4 members would be on 16 drives and 3 members would be on 12 disks.
Again, assuming we are talking about traditional volumes, and not TDEVs.