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From: Enrico Weigelt <weigelt@metux.de>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] defect management block device
Date: Tue, 25 Mar 2008 02:48:10 +0100	[thread overview]
Message-ID: <20080325014810.GB2672@nibiru.local> (raw)
In-Reply-To: <200803242247.00116.alan.mckinnon@gmail.com>

* Alan McKinnon <alan.mckinnon@gmail.com> wrote:

> If SMART (or something conceptually similar) detects that a drive might 
> be failing and be beyond the range of the drive's ability to cope, it 
> could raise an event and move the blocks used to another disk.

And it even would get funnier if the drive's relocation table 
could be accessed (no idea if this is possible): 
The LVM would notice if the drive has relocated an (LBA) block,
move it out of the way (somewhere else in the LV) and then 
remove the relocation (never access that LBA block anymore). 
This way an slowly dying disk can be used for quite a long time.
Think of boxes with very limited physical access (eg. outoor field 
systems) or huge archives w/ non-critical/regeneratable data
(eg. media collections w/ originals available, mirrors, etc).

The idea of using even old and damaged disks at really low costs
(not counting the power consumption ;-P) is seems quite fascinating
to me :)


cu
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  reply	other threads:[~2008-03-25  1:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-24 14:32 [gentoo-user] defect management block device Enrico Weigelt
2008-03-24 15:58 ` Alan McKinnon
2008-03-24 18:23   ` Eric Martin
2008-03-24 20:47     ` Alan McKinnon
2008-03-25  1:48       ` Enrico Weigelt [this message]
2008-03-25  8:56         ` Alan McKinnon

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