linux-kernel - Re: Software RAID1 (with non-identical discs) performance

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Message-ID: <Pine.LNX.4.61.0612191641570.10396@yvahk01.tjqt.qr>
Date:	Tue, 19 Dec 2006 16:43:36 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Michael Tokarev <mjt@....msk.ru>
cc:	Wiebe Cazemier <halfgaar@....net>, linux-kernel@...r.kernel.org
Subject: Re: Software RAID1 (with non-identical discs) performance

>Think of "PnP geometry" supported by all nowadays drives.
>
>It's 255 heads, 63 sectors per track, and whatever number of cylinders.

You do not really need the 255-63-X PNP mode. Given a hard disk small
enough, VMware may make it a 16-63-X, 16-64-X, or something like
that. Still works as intended.

You see, the kernel mostly gives a damn about CHS, since the moment
the partition table is scanned, it is translated into LBA offsets (
part of that should be seen in /proc/partitions).

	-`J'
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