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777
December 1st, 2011 08:00
Optimal TDEV size and meta creation. . .
All:
I have heard that the optimal size meta, for performance, is 8 TDEV's. An EMC guy came in the other day, and said that for performance, my TDEV's should be 64GB max. I can't live with 512GB metas.
Is the 64GB number real? There are so many differing "best practices" out there, it's hard to know what's official.
Can anyone point me to a document, or clarify this at all?
Thanks,
Brandon
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Quincy561
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December 1st, 2011 08:00
The size of the volumes have no impact on performance at the volume level. However if there is some relationship to size and IO load, then a larger volume may have a higher IO load (IO density).
BRiley1
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December 2nd, 2011 06:00
OK. Based on the 8 splits per disk recommendation, would an auto meta member size of 69905 cyl. be a good route to go? Device count is not likely to be a concern.
Quincy561
1.3K Posts
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December 2nd, 2011 07:00
There is no relationship to the size of the TDATs and the size of the TDEVs.
You may need to make 8 or 16 way striped meta volumes for very high performance host LUNs, irregardless of the size of the LUN. The other option is to use several Symmextrix volumes and create a host striped volume.
The main point is that for high performance demanding volumes (1000s of IOs per second, or 100s of MB/sec) you will probably need many Symm volumes active.