From: David Sterba <dsterba@suse.cz>
To: Qu Wenruo <wqu@suse.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH] btrfs: Allow more disks missing for RAID10
Date: Thu, 25 Jul 2019 20:37:41 +0200 [thread overview]
Message-ID: <20190725183741.GX2868@twin.jikos.cz> (raw)
In-Reply-To: <20190718062749.11276-1-wqu@suse.com>
On Thu, Jul 18, 2019 at 02:27:49PM +0800, Qu Wenruo wrote:
> RAID10 can accept as much as half of its disks to be missing, as long as
> each sub stripe still has a good mirror.
Can you please make a test case for that?
I think the number of devices that can be lost can be higher than a half
in some extreme cases: one device has copies of all stripes, 2nd copy
can be scattered randomly on the other devices, but that's highly
unlikely to happen.
On average it's same as raid1, but the more exact check can potentially
utilize the stripe layout.
next prev parent reply other threads:[~2019-07-25 18:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-18 6:27 [PATCH] btrfs: Allow more disks missing for RAID10 Qu Wenruo
2019-07-25 18:37 ` David Sterba [this message]
2019-07-25 19:14 ` Austin S. Hemmelgarn
2019-07-25 23:41 ` Qu Wenruo
2019-07-26 10:39 ` David Sterba
2019-07-31 6:58 ` Qu Wenruo
2019-07-31 13:23 ` David Sterba
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