On Thu, Aug 10, 2006 at 10:49:37AM +0200, Tomasz Chmielewski wrote:
With RAID-0 on top of RAID-1, with 4 drives, I would achieve:
- 100% chance of recovery if any single, one disk fails,
- 50% chance of recovery if any two disks fail.
Now with RAID-10 in the Linux kernel, what are my chances of recovering
from a single and two disk failure?
Is it also 100% if one disk fails, and 50% if two disks fail?
if the number of copies is 2 yes
Or perhaps, with 4 drives, RAID-10 can survive any 2 disks failure?
nope
note that with raid10 the number of copies for each stripe does not need
to be a divisor of the number of drives.
e.g you can have 4 drives and 3 stripe copies.
in this case you are able to survive any 2 disk failure. but the usable
space is DRIVE_SIZE * 1.33
L.
--
Luca Berra -- bluca@xxxxxxxxxx
Communication Media & Services S.r.l.
/"\
\ / ASCII RIBBON CAMPAIGN
X AGAINST HTML MAIL
/ \
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
