> On 16 Dec 2014, at 14:51, Graeme B. Bell <grb@skogoglandskap.no> wrote:
>
>>
>> I don't understand the logic behind using drives,
>> which are best for random io, for sequent io workloads.
>
> Because they are also best for sequential IO. I get 1.3-1.4GB/second from 4 SSDs in RAID or >500MB/s for single disk
systems,even with cheap models.
> Are you getting more than that from high-end spinning rust?
I better use ssd for random iops when database doesn't fit in ram.
For wal logs i use raid with bbu cache and couple of sas drives.
