Re: [ADMIN] H/W RAID 5 on slower disks versus no raid on

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От Bjoern Metzdorf
Тема Re: [ADMIN] H/W RAID 5 on slower disks versus no raid on
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Msg-id 016901c291a9$0f23cc20$0564a8c0@toolteam.net
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Ответ на Re: [ADMIN] H/W RAID 5 on slower disks versus no raid on  ("scott.marlowe" <scott.marlowe@ihs.com>)
Ответы Re: [ADMIN] H/W RAID 5 on slower disks versus no raid on  ("scott.marlowe" <scott.marlowe@ihs.com>)
Список pgsql-performance
> Generally RAID 5.  RAID 1 is only faster if you are doing a lot of
> parellel reads.  I.e. you have something like 10 agents reading at the
> same time.  RAID 5 also works better under parallel load than a single
> drive.

yep, but write performance sucks.

> The fastest of course, is multidrive RAID0.  But there's no redundancy.

With 4 drives I'd always go for raid 10, fast and secure

> Oddly, my testing doesn't show any appreciable performance increase in
> linux by layering RAID5 or 1 over RAID0 or vice versa, something that
> is usually faster under most setups.

Is this with linux software raid? raid10 is not significantly faster? cant
believe that...

Regards,
Bjoern


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