Comments on: MD1000 and MD3000 Redundancy Matrix http://www.jebriggs.com/blog/2009/12/md1000-and-md3000-redundancy-matrix/ Observations by a Programmer of Silicon Valley and Beyond Wed, 25 Jan 2012 03:01:54 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Rogan http://www.jebriggs.com/blog/2009/12/md1000-and-md3000-redundancy-matrix/comment-page-1/#comment-26939 Rogan Mon, 04 Jan 2010 04:45:27 +0000 http://www.jebriggs.com/blog/?p=1477#comment-26939 Thought you might want to read this given our past conversations: http://makarevitch.org/rant/raid/ a good read, lots of numbers, boils down to use RAID 10, RAID controllers are expensive chassis ornaments, and potential bottle necks. Avoid RAID 5. ( & 6 their parity xsum is too costly for rand IO, such as internet file servers, DBs etc. ) Not mentioned in the rant but read elsewhere, putting the filesystem journal on an SSD could help IOPS along nicely as well. -R Thought you might want to read this given our past conversations:
http://makarevitch.org/rant/raid/

a good read, lots of numbers, boils down to use RAID 10, RAID controllers are expensive chassis ornaments, and potential bottle necks.

Avoid RAID 5. ( & 6 their parity xsum is too costly for rand IO, such as internet file servers, DBs etc. )

Not mentioned in the rant but read elsewhere, putting the filesystem journal on an SSD could help IOPS along nicely as well.

-R

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