Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
> Jennifer Spencer<jenniferm411(at)hotmail(dot)com> wrote:
>> new ones coming have 5 TB each of RAID disks mirrored across to
>> another 5TB (20 5.4gb spinning disks). Not sure the RAID level but
>> I think it's level six. They each have 16 CPUs, and (I believe)
>> 128 Gb of RAM, connected to our NFS network on a 10g switch (at
>> least I think it's the 10 gigabit switch - it might be one
>> gigabit).
> get a battery backed cache if you can.
I'd say that with the rest of the hardware described, performance will
be very disappointing without a good RAID controller with battery
backed cache configured for write-back. Also, file system (we use
XFS) and mount options (we use noatime and nobarrier), and elevator
(we use deadline) can make a big difference.
-Kevin