Am 23.12.2011 08:05, schrieb Scott Marlowe:
On Thu, Dec 22, 2011 at 11:18 PM, tuanhoanganh wrote:
Thanks for your answer. But how performance between raid5 and one disk.
One disk will usually win, 2 disks (in a mirror) will definitely win.
RAID-5 has the highest overhead and the poorest perfor
I'm not so confident that a RAID-1 will win over a single disk. When it
comes to writes, the latency should be ~50 higher (if both disk must
sync), since the spindles are not running synchronously. This applies to
softraid, not something like a battery-backend raid controller of course.
Or am I w
On Fri, Dec 23, 2011 at 5:15 AM, alexandre - aldeia digital
wrote:
>> I'm not so confident that a RAID-1 will win over a single disk. When it
>> comes to writes, the latency should be ~50 higher (if both disk must
>> sync), since the spindles are not running synchronously. This applies to
>> softr
Thanks for all. I change to RAID 1 and here is new pg_bench result:
pgbench -h 127.0.0.1 -p 5433 -U postgres -c 10 -T 1800 -s 10 pgbench
Scale option ignored, using pgbench_branches table count = 10
starting vacuum...end.
transaction type: TPC-B (sort of)
scaling factor: 10
query mode: simple
nu
On Fri, Dec 23, 2011 at 8:32 AM, tuanhoanganh wrote:
> Thanks for all. I change to RAID 1 and here is new pg_bench result:
>
> pgbench -h 127.0.0.1 -p 5433 -U postgres -c 10 -T 1800 -s 10 pgbench
> Scale option ignored, using pgbench_branches table count = 10
> starting vacuum...end.
> transacti
