From: Adam Goryachev <adam@websitemanagers.com.au>
To: "Ralf Müller" <ralf@bj-ig.de>
Cc: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: Howto avoid full re-sync
Date: Wed, 12 Sep 2012 22:52:18 +1000 [thread overview]
Message-ID: <50508582.3070501@websitemanagers.com.au> (raw)
In-Reply-To: <C0796F33-32E4-4F28-B6FB-469AF438C545@bj-ig.de>
On 11/09/12 00:12, Ralf Müller wrote:
> Besides all the stuff about fix your server, a raid is not a backup and you risk your data - simply add a write intent bitmap:
>
> mdadm /dev/md2 --grow --bitmap=internal
I've added this across a number of my systems now, and it seems to work
really well (Thank You), especially one system which has a RAID1 with an
external USB drive + internal drive which normally take over 2 days for
a full resync.
Can you suggest if there is any dis-advantage to using the bitmap (maybe
write performance will suffer), or disk space is reduced, or ....
While I can see the benefits, I'm just wondering if it might be too good
to be true, or what I am missing....
Thanks again for your assistance.
Regards,
Adam
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next prev parent reply other threads:[~2012-09-12 12:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-07 4:41 Howto avoid full re-sync Adam Goryachev
2012-09-07 9:41 ` Ralf Müller
2012-09-07 12:41 ` Phil Turmel
2012-09-09 23:11 ` Adam Goryachev
2012-09-10 1:02 ` NeilBrown
2012-09-10 14:12 ` Ralf Müller
2012-09-12 12:52 ` Adam Goryachev [this message]
2012-09-12 13:28 ` John Robinson
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