| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Michelle Konzack <linux4michelle(at)freenet(dot)de> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: 3 x PostgreSQL in cluster/redunant |
| Date: | 2005-11-15 20:06:20 |
| Message-ID: | 437A3FBC.5050905@commandprompt.com |
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| Thread: | |
| Lists: | pgsql-general |
Michelle Konzack wrote:
> Am 2005-11-14 16:54:41, schrieb Jim C. Nasby:
>
>> On Mon, Nov 14, 2005 at 07:36:44PM +0100, Michelle Konzack wrote:
>>
>>> Hello *,
>>>
>>> I have three Sun Server where I have reserved on each Server a Raid-5
>>> of 1 TByte for my PostgreSQL. The first PostgreSQL is up and running
>>> with a database of 150 GByte.
>>>
>> Keep in mind that databases and RAID5 generally don't mix very well.
>>
>
> Can you explain me why?
>
RAID 5 is very expensive for writes.
> Unfortunatly the Controllers in the three SUN-Servers do not support
> 300 GByte SCSI-Drives, so I have to continue with the Raid-5 of 16x
> 76 GByte.
>
Could you do RAID 10?
Sincerely,
Joshua D. Drake
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