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Re: LBA to File?

To: Eric Sandeen <sandeen@xxxxxxx>
Subject: Re: LBA to File?
From: Bogdan Costescu <bogdan.costescu@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 7 Mar 2003 12:07:53 +0100 (CET)
Cc: Andi Kleen <ak@xxxxxxx>, "Buzbee, James" <James.Buzbee@xxxxxxxxxxxx>, <linux-xfs@xxxxxxxxxxx>
In-reply-to: <1046993631.440.280.camel@xxxxxxxxxxxxxxxxxxxxxx>
Sender: linux-xfs-bounce@xxxxxxxxxxx
On 6 Mar 2003, Eric Sandeen wrote:

> Hm, I suppose that for the truly paranoid, with cheap IDE disks,

No, not only for them. The frequent access exists for all drives and 
will destroy a high-end SCSI disk just as well, but maybe not as fast. 

> there could be an option to rotate an internal log through the AGs each
> time you mount.

Ehh, how about those using XFS on file servers that have to have an uptime 
of hundreds of days ? Changing its place online would be bliss...

However, placing the journal seems to raise the problem: where ? As it's 
accessed often, it should be on the area of the disk where speed is 
maximum (speed = read+write+seek). But if it's moved, can the new location 
be controlled somehow so that it doesn't accidentally end up in an area 
with low speed ? Of course, that does mean that free space has to exist at 
the new location. That begs the question: could defragmentation or 
something similar take care of creating free space at a specific location 
on disk ?

Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu@xxxxxxxxxxxxxxxxxxxxx

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