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

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Message-ID:  <em915v$7h6$1@sea.gmane.org>
Date:	Tue, 19 Dec 2006 16:40:46 +0100
From:	Wiebe Cazemier <halfgaar@....net>
To:	linux-kernel@...r.kernel.org
Subject:  Re: Software RAID1 (with non-identical discs) performance

On Tuesday 19 December 2006 15:16, Dick Streefland wrote:

> An easy way to clone a partition table is:
> 
>   sfdisk -d /dev/sdX | sfdisk /dev/sdY
> 

And with one Maxtor 250 GB and one Seagate 250 GB, will that work? It can go
wrong on two accounts; the geometry issue I desbribed (which, I understand,
shouldn't be an issue at all), and if you're trying to clone the partition
table on a smaller disk. The latter would be fixed by leaving some unpartioned
space available.

This is something I'm going to experiment with on several disks I have.

On a sidenote, can you use this command, along with "dd if=oldpartition
of=newpartition" to clone an old disk to a new one (including NTFS/FAT
partitions for example), like Seagate disk wizzard does, and have a working
bootable system on the new disk? Or, can that even be done by dd-ing the
entire disk, and not individual partitions? I can remember G4u being
uncomfortable with that.

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