Postgres Pro
Downloads
Home   >   mailing lists

Re: With 4 disks should I go for RAID 5 or RAID 10 - Mailing list pgsql-performance

From Greg Smith
Subject Re: With 4 disks should I go for RAID 5 or RAID 10
Date
Msg-id Pine.GSO.4.64.0712261311190.11546@westnet.com
Whole thread Raw
In response to Re: With 4 disks should I go for RAID 5 or RAID 10  (Mark Mielke <mark@mark.mielke.cc>)
List pgsql-performance
Tree view 
On Wed, 26 Dec 2007, Mark Mielke wrote:

> I believe hardware RAID 5 is also horrible, but since the hardware hides
> it from the application, a hardware RAID 5 user might not care.

Typically anything doing hardware RAID 5 also has a reasonable sized write
cache on the controller, which softens the problem a bit.  As soon as you
exceed what it can buffer you're back to suffering again.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD

pgsql-performance by date:

Previous
From: "Chris Hoover"
Date:
Subject: Anyone running on RHEL Cluster?
Next
From: Greg Smith
Date:
Subject: Re: More shared buffers causes lower performances