| From: | Anton Belyaev <anton(dot)belyaev(at)gmail(dot)com> |
|---|---|
| To: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
| Cc: | Greg Smith <greg(at)2ndquadrant(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Huge iowait during checkpoint finish |
| Date: | 2010-01-11 10:53:33 |
| Message-ID: | d7e834b1001110253x2c8732e7i419b8166c36c3b1e@mail.gmail.com |
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| Lists: | pgsql-general |
2010/1/9 Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>:
> On Fri, Jan 8, 2010 at 3:07 PM, Greg Smith <greg(at)2ndquadrant(dot)com> wrote:
>> Basically, you have a couple of standard issues here:
>>
>> 1) You're using RAID-5, which is not known for good write performance. Are
>> you sure the disk array performs well on writes? And if you didn't
>> benchmark it, you can't be sure.
>
> This can be doubly bad if he's now moved to a set of disks that are
> properly obeying fsync but was on disks that were lying about it
> before.
>
Scott, thanks for the interesting suggestion.
And how do I check this?
Old RAID-1 has "hardware" LSI controller.
I still have access to old server.
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