Re: mysql to postgresql, performance questions

On Thu, Mar 25, 2010 at 2:29 PM, Pierre C <lists@peufeu.com> wrote:
>> Hannu Krosing wrote:
>>>
>>> Pulling the plug should not corrupt a postgreSQL database, unless it was
>>> using disks which lie about write caching.
>>>
>> Didn't we recently put the old wife's 'the disks lied' tale to bed in
>> favour of actually admiting that some well known filesystems and saftware
>> raid systems have had trouble with their write barriers?
>
> I put a cheap UPS on the home server (which uses Software RAID) precisely
> because I don't really trust that stuff, and there is also the RAID5 write
> hole... and maybe the RAID1 write hole too... and installing a UPS takes
> less time that actually figuring out if the system is power-loss-safe.

Very true, a UPS might not cover every possible failure mode, but it
sure takes care of an aweful lot of the common ones.