Thanks much for the specific info on Areca RAID cards. Very helpful. On Jun 17, 2011, at 11:20 AM, Scott Marlowe wrote: > The problem with RAID-5 is crappy write performance. Being big or > small won't change that. Plus if the db is small why use RAID-5? It's small enough that there's some other things going on at the same small server with 4 disk bays ;-) My thinking was that write-back cache might mitigate the poor write performance enough to not be noticed. This db doesn't generally get big batch updates anyway, it's mostly a constant stream of small updates coming in and I have a hard time imagining 256MB of cache filling up very often. (I have at least a fuzzy understanding of how WAL segments affect the write load.) RAID-1 & RAID-10 are not ruled out, I'm just exploring options. And I'm not actually wanting to use RAID 5; it's RAID 6 that I'm considering... -- Scott Ribe scott_ribe@xxxxxxxxxxxxxxxx http://www.elevated-dev.com/ (303) 722-0567 voice -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
