From: Edmund Urbani <edmund.urbani@liland.com>
To: Zygo Blaxell <ce3g8jdj@umail.furryterror.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: MD RAID 5/6 vs BTRFS RAID 5/6
Date: Mon, 21 Oct 2019 17:27:54 +0200 [thread overview]
Message-ID: <067d06fc-4148-b56f-e6b4-238c6b805c11@liland.com> (raw)
In-Reply-To: <20191016194237.GP22121@hungrycats.org>
On 10/16/19 9:42 PM, Zygo Blaxell wrote:
>
> For raid5 I'd choose btrfs -draid5 -mraid1 over mdadm raid5
> sometimes--even with the write hole, I'd expect smaller average data
> losses than mdadm raid5 + write hole mitigation due to the way disk
> failure modes are distributed.
What about the write hole and RAID-1? I understand the write hole is most
commonly associated with RAID-5, but it is also a problem with other RAID levels.
You would need to scrub after a power failure to be sure that no meta data gets
corrupted even with RAID-1. Otherwise you might still have inconsistent copies
and the problem may only become apparent when one drive fails. Can we be certain
that scrubbing is always able to fix such inconsistencies with RAID-1?
Regards,
Edmund
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next prev parent reply other threads:[~2019-10-21 15:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-16 15:40 MD RAID 5/6 vs BTRFS RAID 5/6 Edmund Urbani
2019-10-16 19:42 ` Zygo Blaxell
2019-10-21 15:27 ` Edmund Urbani [this message]
2019-10-21 19:34 ` Zygo Blaxell
2019-10-23 16:32 ` Edmund Urbani
2019-10-26 0:01 ` Zygo Blaxell
2019-10-17 4:07 ` Jon Ander MB
2019-10-17 15:57 ` Chris Murphy
2019-10-17 18:23 ` Graham Cobb
2019-10-20 21:41 ` Chris Murphy
2019-10-18 22:19 ` Supercilious Dude
[not found] ` <CAGmvKk4wENpDqLFZG+D8_zzjhXokjMfdbmgTKTL49EFcfdVEtQ@mail.gmail.com>
2019-10-20 21:43 ` Chris Murphy
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