From: Wols Lists <antlists@youngman.org.uk>
To: LM <linux-raid@moellendorf.eu>, linux-raid@vger.kernel.org
Subject: Re: Level change from 4 disk RAID5 to 4 disk RAID6
Date: Mon, 10 Apr 2017 06:41:08 +0100 [thread overview]
Message-ID: <58EB1AF4.5010005@youngman.org.uk> (raw)
In-Reply-To: <20170408214239.GF10267@lars-laptop>
On 08/04/17 22:42, LM wrote:
> Hi,
>
> I have a 4 disk RAID5, the used dev size is 640.05 GB. Now I want to
> replace the 4 disks by 4 disks with a size of 2TB each.
>
> As far as I understand the man page, this can be achieved by replacing
> the devices one after another and for each device rebuild the degraded
> array with:
>
> mdadm /dev/md0 --add /dev/sdX1
Do you have a spare SATA port or whatever your drives are. If so, then
use the --replace option to mdadm, don't fail then add. You're risking a
drive failure taking out your array - not a good move.
And if you don't have a spare port, $20 for a PCI card or whatever is a
good investment to keep your data safe.
Have a look at the raid wiki - it tries to be a bit more verbose and
easily comprehensible than the man page.
Cheers,
Wol
next prev parent reply other threads:[~2017-04-10 5:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-08 21:42 Level change from 4 disk RAID5 to 4 disk RAID6 LM
2017-04-10 1:04 ` NeilBrown
2017-04-11 21:27 ` LM
2017-04-10 5:41 ` Wols Lists [this message]
2017-04-11 21:28 ` LM
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