From: Hugo Mills <hugo@carfax.org.uk>
To: David Sterba <dsterba@suse.com>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: [PATCH v2 0/6] RAID1 with 3- and 4- copies
Date: Mon, 10 Jun 2019 12:42:26 +0000 [thread overview]
Message-ID: <20190610124226.GA21016@carfax.org.uk> (raw)
In-Reply-To: <cover.1559917235.git.dsterba@suse.com>
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Hi, David,
On Mon, Jun 10, 2019 at 02:29:40PM +0200, David Sterba wrote:
> this patchset brings the RAID1 with 3 and 4 copies as a separate
> feature as outlined in V1
> (https://lore.kernel.org/linux-btrfs/cover.1531503452.git.dsterba@suse.com/).
[...]
> Compatibility
> ~~~~~~~~~~~~~
>
> The new block group types cost an incompatibility bit, so old kernel
> will refuse to mount filesystem with RAID1C3 feature, ie. any chunk on
> the filesystem with the new type.
>
> To upgrade existing filesystems use the balance filters eg. from RAID6
>
> $ btrfs balance start -mconvert=raid1c3 /path
[...]
If I do:
$ btrfs balance start -mprofiles=raid13c,convert=raid1 \
-dprofiles=raid13c,convert=raid6 /path
will that clear the incompatibility bit?
(I'm not sure if profiles= and convert= work together, but let's
assume that they do for the purposes of this question).
Hugo.
--
Hugo Mills | The enemy have elected for Death by Powerpoint.
hugo@... carfax.org.uk | That's what they shall get.
http://carfax.org.uk/ |
PGP: E2AB1DE4 | gdb
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next prev parent reply other threads:[~2019-06-10 12:42 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-10 12:29 [PATCH v2 0/6] RAID1 with 3- and 4- copies David Sterba
2019-06-10 12:29 ` [PATCH v2 1/6] btrfs: add mask for all RAID1 types David Sterba
2019-06-10 12:29 ` [PATCH v2 2/6] btrfs: use mask for RAID56 profiles David Sterba
2019-06-10 12:29 ` [PATCH v2 3/6] btrfs: document BTRFS_MAX_MIRRORS David Sterba
2019-06-10 12:29 ` [PATCH v2 4/6] btrfs: add support for 3-copy replication (raid1c3) David Sterba
2019-06-10 12:29 ` [PATCH v2 5/6] btrfs: add support for 4-copy replication (raid1c4) David Sterba
2019-06-10 12:29 ` [PATCH v2 6/6] btrfs: add incompat for raid1 with 3, 4 copies David Sterba
2019-06-10 12:29 ` [PATCH] btrfs-progs: add support for raid1c3 and raid1c4 David Sterba
2019-06-10 12:42 ` Hugo Mills [this message]
2019-06-10 14:02 ` [PATCH v2 0/6] RAID1 with 3- and 4- copies David Sterba
2019-06-10 14:48 ` Hugo Mills
2019-06-11 9:53 ` David Sterba
2019-06-11 12:03 ` David Sterba
2019-06-25 17:47 ` David Sterba
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