rooling replication and many pop3d

[Eric Luyten]

On Thu, November 24, 2011 11:52 am, Oberdan Albertoni wrote:

> I have  4 HDD 500GB S SATA II
> with LSI 8704 ELP SAS RAID 6
> filesystem ext3 mounted with noatime, nodiratime


RAID 6 over four disks.

FYI, RAID 6 carries the highest 'write penalty' of all RAID levels.

http://www.techrepublic.com/blog/datacenter/calculate-iops-in-a-storage-array/2182


Rearranging your disks is most likely not a short term solution.
(can probably be done in a weekend's downtime but beware,
 restoring a few million small files takes a LOT more time
 than dumping them to another medium, be it disk or tape)

*If* your system has a fifth drive bay, RAID 1+0 and one hot spare
would have given you a much, much faster mail spool of equal size,
at little extra cost.


Eric Luyten.