From: Roman Mamedov <rm@romanrm.net>
To: linux-raid@vger.kernel.org
Subject: How to enable bitmap on IMSM?
Date: Tue, 14 Jun 2022 14:14:42 +0500 [thread overview]
Message-ID: <20220614141442.1971c876@nvm> (raw)
Hello,
I upgraded mdadm to 4.2 to get the bitmap support in IMSM.
I run: "mdadm --update-subarray=0 -U bitmap /dev/md127"
However the array details stay the same, with "Consistency Policy : resync".
No error is reported, and nothing in dmesg.
How to actually use it?
Thanks
# mdadm --detail /dev/md127
/dev/md127:
Version : imsm
Raid Level : container
Total Devices : 4
Working Devices : 4
UUID : d07837ca:804cf5e3:01c52352:f64b0524
Member Arrays : /dev/md/Volume0
Number Major Minor RaidDevice
- 8 32 - /dev/sdc
- 8 0 - /dev/sda
- 8 48 - /dev/sdd
- 8 16 - /dev/sdb
# mdadm --detail /dev/md126
/dev/md126:
Container : /dev/md/imsm0, member 0
Raid Level : raid10
Array Size : 1953519616 (1863.02 GiB 2000.40 GB)
Used Dev Size : 976759808 (931.51 GiB 1000.20 GB)
Raid Devices : 4
Total Devices : 4
State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Layout : near=2
Chunk Size : 64K
Consistency Policy : resync
UUID : xxx
Number Major Minor RaidDevice State
3 8 0 0 active sync set-A /dev/sda
2 8 16 1 active sync set-B /dev/sdb
1 8 32 2 active sync set-A /dev/sdc
0 8 48 3 active sync set-B /dev/sdd
# mdadm --update-subarray=0 -U bitmap /dev/md127
# mdadm --detail /dev/md127
/dev/md127:
Version : imsm
Raid Level : container
Total Devices : 4
Working Devices : 4
UUID : d07837ca:804cf5e3:01c52352:f64b0524
Member Arrays : /dev/md/Volume0
Number Major Minor RaidDevice
- 8 32 - /dev/sdc
- 8 0 - /dev/sda
- 8 48 - /dev/sdd
- 8 16 - /dev/sdb
# mdadm --detail /dev/md126
/dev/md126:
Container : /dev/md/imsm0, member 0
Raid Level : raid10
Array Size : 1953519616 (1863.02 GiB 2000.40 GB)
Used Dev Size : 976759808 (931.51 GiB 1000.20 GB)
Raid Devices : 4
Total Devices : 4
State : active
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Layout : near=2
Chunk Size : 64K
Consistency Policy : resync
UUID : xxx
Number Major Minor RaidDevice State
3 8 0 0 active sync set-A /dev/sda
2 8 16 1 active sync set-B /dev/sdb
1 8 32 2 active sync set-A /dev/sdc
0 8 48 3 active sync set-B /dev/sdd
--
With respect,
Roman
next reply other threads:[~2022-06-14 9:20 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-14 9:14 Roman Mamedov [this message]
2022-06-14 14:45 ` How to enable bitmap on IMSM? Mariusz Tkaczyk
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