| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> |
| Cc: | Dan Birken <birken(at)gmail(dot)com>, pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Which RAID Controllers to pick/avoid? |
| Date: | 2011-02-03 06:02:19 |
| Message-ID: | AANLkTikaNw=gSE8M6ry_MGRaYtdREBrS9xkVOpsFE+UF@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Wed, Feb 2, 2011 at 7:00 PM, Craig Ringer
<craig(at)postnewspapers(dot)com(dot)au> wrote:
> Whatever RAID controller you get, make sure you have a battery backup
> unit (BBU) installed so you can safely enable write-back caching.
> Without that, you might as well use software RAID - it'll generally be
> faster (and cheaper) than HW RAID w/o a BBU.
Recently we had to pull our RAID controllers and go to plain SAS
cards. While random access dropped a bit, sequential throughput
skyrocketed, saturating the 4 lane cable we use. 4x300Gb/s =
1200Gb/s or right around 1G of data a second off the array. VERY
impressive.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Greg Smith | 2011-02-03 06:15:32 | Re: Which RAID Controllers to pick/avoid? |
| Previous Message | Scott Marlowe | 2011-02-03 05:58:38 | Re: Which RAID Controllers to pick/avoid? |