From: Hubert Tonneau <hubert.tonneau@fullpliant.org>
To: linux-btrfs@vger.kernel.org
Subject: Avoiding BRTFS RAID5 write hole
Date: Tue, 12 Nov 2019 15:13:26 GMT [thread overview]
Message-ID: <0JG8IAF11@briare1.fullpliant.org> (raw)
Hi,
In order to close the RAID5 write hole, I prepose the add a mount option that would change RAID5 (and RAID6) behaviour :
. When overwriting a RAID5 stripe, first convert it to RAID1 (convert it to RAID1C3 if it was RAID6)
. Have a background process that converts RAID1 stripes to RAID5 (RAID1C3 to RAID6)
Expected advantages are :
. the low level features set basically remains the same
. the filesystem format remains the same
. old kernels and btrs-progs would not be disturbed
The end result would be a mixed filesystem where active parts are RAID1 and archives one are RAID5.
Regards,
Hubert Tonneau
next reply other threads:[~2019-11-12 14:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-12 15:13 Hubert Tonneau [this message]
2019-11-12 18:44 ` Avoiding BRTFS RAID5 write hole Chris Murphy
2019-11-12 19:49 ` Goffredo Baroncelli
2019-11-14 4:25 ` Zygo Blaxell
2019-11-12 22:27 Hubert Tonneau
2019-11-13 19:34 ` Goffredo Baroncelli
2019-11-13 22:29 Hubert Tonneau
2019-11-13 22:51 ` waxhead
2019-11-14 21:25 ` Goffredo Baroncelli
2019-11-15 20:41 ` Hubert Tonneau
2019-11-17 8:53 ` Goffredo Baroncelli
2019-11-17 19:49 ` Hubert Tonneau
2019-11-28 11:37 ` Hubert Tonneau
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