Re: SSD + RAID

* david@lang.hm <david@lang.hm> [100223 15:05]:

> However, one thing that you do not get protection against with software  
> raid is the potential for the writes to hit some drives but not others. 
> If this happens the software raid cannot know what the correct contents 
> of the raid stripe are, and so you could loose everything in that stripe  
> (including contents of other files that are not being modified that  
> happened to be in the wrong place on the array)

That's for stripe-based raid.  Mirror sets like raid-1 should give you
either the old data, or the new data, both acceptable responses since
the fsync/barreir hasn't "completed".

Or have I missed another subtle interaction?

a.

-- 
Aidan Van Dyk                                             Create like a god,
aidan@highrise.ca                                       command like a king,
http://www.highrise.ca/                                   work like a slave.