Hello,
Instead of using 3 disks in RAID-0 and one without RAID for archive, I
would rather invest into one extra disk and have either a RAID 1+0
setup or use two disks in RAID-1 for the WAL and two disks in RAID-1
for the main database (I'm not sure which perform better between those
two solutions).
RAID-1 will give you about twice as fast reads as no RAID (and RAID
1+0 will give you twice as fast as RAID 0), with no significant
penalty for writing, and it'll save a lot of manpower in case on disk
dies.
If you can afford hot-swappable disks, you can even replace a failed
disk live, in a few minutes, with no failure at software level.
Everything can be remotely setup, including adding/removing a disk
from RAID array, if you use Linux software RAID (mdadm), except of
course the physical swap of the disk, but that can be done by a
non-technician.
This solution costs only one extra disk (which is quite cheap
nowadays) and will deliver enhanced performances and save a lot of
manpower and downtime in case of disk breaking.
Regards,
--
Gaël Le Mignot - gael@pilotsystems.net
Pilot Systems - 9, rue Desargues - 75011 Paris
Tel : +33 1 44 53 05 55 - www.pilotsystems.net
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