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Re: XFS and DPX files

To: linux-xfs@xxxxxxxxxxx
Subject: Re: XFS and DPX files
From: Martin Spott <Martin.Spott@xxxxxxxxx>
Date: Mon, 14 Dec 2009 16:17:28 +0000 (UTC)
Newsgroups: list.linux-xfs
Organization: home
References: <4AEC2CF4.8040703@xxxxxxx> <200911021205.28006@xxxxxx> <200911022258.35164@xxxxxx>
User-agent: tin/1.9.3-20080506 ("Dalintober") (UNIX) (Linux/2.6.32 (x86_64))
Michael Monnerie wrote:

> Don't mix up the controller write cache vs. disk write cache. The 
> controller write cache should be on whenever you have a BBM installed, 
> because this brings real performance, while the disk write cache should 
> always be off in a production environment, because you will loose data 
> on power fail, which nobody can recognize (the controller believes the 
> sectors to be written already...)

I've been under the impression that "modern disks" (TM), at minimum the
server-type products, are supposed to re-use the remaining spin-energy
for generating the required power and thus writing the content of their
on-disk write cache to the disks.

Cheers,
        Martin.
-- 
 Unix _IS_ user friendly - it's just selective about who its friends are !
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