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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

             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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