| From: | Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | tuanhoanganh <hatuan05(at)gmail(dot)com> |
| Cc: | alexandre - aldeia digital <adaldeia(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Postgresql 9.0.6 Raid 5 or not please help. |
| Date: | 2011-12-25 07:15:01 |
| Message-ID: | CAOR=d=0mtF4ZHe7z9uUqdGmDX10EwHGfq07OsqJ9y3jBP5p_tw@mail.gmail.com |
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| Lists: | pgsql-performance |
On Sat, Dec 24, 2011 at 8:13 PM, tuanhoanganh <hatuan05(at)gmail(dot)com> wrote:
> Thank for your information.
> My postgresql config fsync default
> #fsync = on # turns forced synchronization on or off
> My RAID is ServeRAID M5015 SAS/SATA controller, in MegaRaid Store Manager it
> show BBU Present = YES.
> Does it have battery backed caching RAID controller?
> Please help me, I am newbie of RAID card manager.
Yep you've got battery backed caching RAID. So regular pgbench tells
you how much faster RAID-1 is than RAID-5 at a read/write mixed load.
You can run it with a -s switch for a read only benchmark to get an
idea how much, if any, of a difference there is between the two.
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