RAID 1 vs RAID 10

[Zach Bagnall]

Thanks, Ries. 4x SAS in 1U is certainly an option. Downside is the extra
expense of SCSI disks and the limited capacity. SATA would give 5-600Gb
logical whereas the most that can be achieved with SAS in 1U is 2x 146Gb
(or 1x 290Gb in RAID10).

I certainly see the benefit in putting the txn log on it's array.

On 05/31/07 15:26, Ries van Twisk wrote:
> Zach,
> 
> I would suggest try to find sas instead of sata,
> then you can get:
> 2x sas in RAID 1
> 2x sas in RAID 1
> Both each there own raid controller
> 
> For PostgreSQL you can store your pg_log and pg_xlog on one array (or
> just pg_xlog on one array, we are experimenting with that still)
> and data on your other array. If you need more speed you can get more
> raid controllers and store your index (tablespace), 
> pg_log and pg_xlog each on there seperate array.