Re: RAID stripe size question - Mailing list pgsql-performance

From Luke Lonergan
Subject Re: RAID stripe size question
Date
Msg-id 3E37B936B592014B978C4415F90D662D03F0D7F6@MI8NYCMAIL06.Mi8.com
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In response to RAID stripe size question  ("Mikael Carneholm" <Mikael.Carneholm@WirelessCar.com>)
Responses Re: RAID stripe size question  ("Merlin Moncure" <mmoncure@gmail.com>)
List pgsql-performance
Merlin,

> moving a gigabyte around/sec on the server, attached or no,
> is pretty heavy lifting on x86 hardware.

Maybe so, but we're doing 2GB/s plus on Sun/Thumper with software RAID
and 36 disks and 1GB/s on a HW RAID with 16 disks, all SATA.

WRT seek performance, we're doing 2500 seeks per second on the
Sun/Thumper on 36 disks.  You might do better with 15K RPM disks and
great controllers, but I haven't seen it reported yet.

BTW - I'm curious about the HP P600 SAS host based RAID controller - it
has very good specs, but is the Linux driver solid?

- Luke


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