On Jan 2, 2010, at 1:47 AM, Andras Spitzer wrote:
Mike,
As far as I know only Hitachi is using such a huge chunk size :
"So each vendor’s implementation of TP uses a different block size.
HDS use 42MB on the USP, EMC use 768KB on DMX, IBM allow a variable
size from 32KB to 256KB on the SVC and 3Par use blocks of just 16KB.
The reasons for this are many and varied and for legacy hardware are
a reflection of the underlying hardware architecture."
http://gestaltit.com/all/tech/storage/chris/thin-provisioning-holy-grail-utilisation/
Also, here Hu explains the reason why they believe 42M is the most
efficient :
http://blogs.hds.com/hu/2009/07/chunk-size-matters.html
He has some good points in his arguments.
Yes, and they apply to ZFS dedup as well... :-)
-- richard
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