Thread (36 messages) 36 messages, 14 authors, 2011-05-07

Re: mdadm raid1 read performance

From: Keld Jørn Simonsen <hidden>
Date: 2011-05-07 10:58:57

On Sat, May 07, 2011 at 12:37:18PM +0200, David Brown wrote:
On 06/05/11 23:05, Leslie Rhorer wrote:
quoted
These systems use so little swap space and so rarely, I'm not sure I
see any benefit to RAID10,f2 for them.  Is there?
Obviously when you use swap rarely, it makes little difference how it is 
laid out on the disk.  And since it is small, there is no difference 
between the speed of the outer and inner tracks (for HD's - for SSD's 
there is obviously no difference), so you don't gain there.  raid10,f2 
will still be better than raid1 for larger reads from swap - but I think 
you would have a hard time trying to spot that effect in the real world.
I think swap on raid10,f2 mostly matters on workstations, where you have 
big apps like OpenOffice.org or firefox, and limited RAM.

best regards
keld
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