Re: Linux: more cores = less concurrency.

On Mon, Apr 11, 2011 at 6:50 PM, mark <dvlhntr(at)gmail(dot)com> wrote:
>
> Interesting, thanks for sharing.
>
> I guess I have never gotten to the point where I felt I needed more than 2
> drives for my xlogs. Maybe I have been dismissing that as a possibility
> something. (my biggest array is only 24 SFF drives tho)
>
> I am trying to get my hands on a dual core lsi card for testing at work.
> (either a 9265-8i or 9285-8e) don't see any dual core 6Gbps SAS Areca cards
> yet....still rocking a Arcea 1130 at home tho.

Make doubly sure whatever machine you're putting it in moves plenty of
air across it's PCI cards. They make plenty of heat. the Areca 1880
are the 6GB/s cards, don't know if they're single or dual core. The
LSI interface and command line tools are so horribly designed and the
performance was so substandard I've pretty much given up on them.
Maybe the newer cards are better, but the 9xxx series wouldn't get
along with my motherboard so it was the 8888 or Areca.

As for pg_xlog, with 4 drives in a RAID-10 we were hitting a limit
with only two drives in RAID-1 against 24 drives in the RAID-10 for
the data store in our mixed load. And we use an old 12xx series Areca
at work for our primary file server and it's been super reliable for
the two years it's been running.