On Tue, Nov 10, 2009 at 09:46:52PM +1300, Simon Baxter wrote:
> What about a simple raid 1 mirror set?
>
Ok.. short comparison, using a single disk as baseline.
using 2 disks
raid0: (striping)
++ double read throughput,
++ double write throughput,
-- half the reliability (read: only use with good backup!)
raid1: (mirroring)
++ double read throughput.
o same write throughput
++ double the reliability
using 3 disks:
raid0: striping
+++ tripple read performance
+++ tripple write performance
--- third of reliability
raid1: mirroring
+++ tripple read performance
o same write throughput
+++ tripple reliability
raid5: (distributed parity)
+++ tripple read performance
- lower write performance (not due to the second write but due
to the necessary reads)
+ sustains failure of any one drive in the set
using 4 disks:
raid1+0:
++++ four times the read performance
++ double write performance
++ double reliability
please note: these are approximations and depending on your hardware
they may be off by quite a bit.
cheers
-henrik
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