Mdadm: различия между версиями

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(не показаны 2 промежуточные версии этого же участника)
Строка 4: Строка 4:
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<syntaxhighlight>
mdadm --create --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2
mdadm --create --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2
</syntaxhighlight>
= Grow =
<syntaxhighlight>
mdadm --grow /dev/md2 --level=1 --raid-devices=3 --add /dev/sdc2
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= Remove disk =
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mdadm --grow /dev/md2 --level=1 --raid-devices=2
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</syntaxhighlight>


Строка 15: Строка 27:
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<syntaxhighlight>
mdadm /dev/md0 --remove /dev/hde1
mdadm /dev/md0 --remove /dev/hde1
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</syntaxhighlight>


= Copy via tar =
= Copy via tar =
Строка 21: Строка 33:
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<syntaxhighlight>
tar cf - . | (cd /work/bkup/jane && tar xBf -)
tar cf - . | (cd /work/bkup/jane && tar xBf -)
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= RO mount alone raid1 partition =
Search for data offset - "Data Offset : 264192 sectors":
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# mdadm --examine /dev/sdd2
/dev/sdd2:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
    Array UUID : 1d5e7657:671add91:63af10f2:badb68a1
          Name : DESKTOP:2  (local to host DESKTOP)
  Creation Time : Wed Sep  7 22:01:17 2022
    Raid Level : raid1
  Raid Devices : 2
Avail Dev Size : 1154033664 sectors (550.29 GiB 590.87 GB)
    Array Size : 577016832 KiB (550.29 GiB 590.87 GB)
    Data Offset : 264192 sectors
  Super Offset : 8 sectors
  Unused Space : before=264112 sectors, after=0 sectors
          State : clean
    Device UUID : 59c97053:db64e186:4dcd2221:34d6ee1a
Internal Bitmap : 8 sectors from superblock
    Update Time : Sat Oct  1 18:56:32 2022
  Bad Block Log : 512 entries available at offset 16 sectors
      Checksum : 11f0755f - correct
        Events : 5610
  Device Role : Active device 1
  Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
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mount loop device with (data offset*512):
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root@DESKTOP:/home/sasha# losetup --find --show --read-only --offset $((264192*512)) /dev/sdd2
/dev/loop22
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Check if fs is clean:
<syntaxhighlight>
# fsck.ext3 -n -v /dev/loop22
e2fsck 1.46.5 (30-Dec-2021)
MIRROR2: clean, 21243/36069376 files, 100445536/144254208 blocks
<syntaxhighlight>
mount fs in RO mode:
<syntaxhighlight>
# mount -o ro /dev/loop22 /mnt/mirror2/
</syntaxhighlight>
</syntaxhighlight>

Текущая версия на 19:08, 1 октября 2022

Create

mdadm --create --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2

Grow

mdadm --grow /dev/md2 --level=1 --raid-devices=3 --add /dev/sdc2

Remove disk

mdadm --grow /dev/md2 --level=1 --raid-devices=2

Remove from array

1. fail 

mdadm /dev/md0 --fail /dev/hde1

2. remove 

mdadm /dev/md0 --remove /dev/hde1

Copy via tar

tar cf - . | (cd /work/bkup/jane && tar xBf -)

RO mount alone raid1 partition

Search for data offset - "Data Offset : 264192 sectors": 

# mdadm --examine /dev/sdd2
/dev/sdd2:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x1
     Array UUID : 1d5e7657:671add91:63af10f2:badb68a1
           Name : DESKTOP:2  (local to host DESKTOP)
  Creation Time : Wed Sep  7 22:01:17 2022
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 1154033664 sectors (550.29 GiB 590.87 GB)
     Array Size : 577016832 KiB (550.29 GiB 590.87 GB)
    Data Offset : 264192 sectors
   Super Offset : 8 sectors
   Unused Space : before=264112 sectors, after=0 sectors
          State : clean
    Device UUID : 59c97053:db64e186:4dcd2221:34d6ee1a

Internal Bitmap : 8 sectors from superblock
    Update Time : Sat Oct  1 18:56:32 2022
  Bad Block Log : 512 entries available at offset 16 sectors
       Checksum : 11f0755f - correct
         Events : 5610


   Device Role : Active device 1
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)

mount loop device with (data offset*512): 

root@DESKTOP:/home/sasha# losetup --find --show --read-only --offset $((264192*512)) /dev/sdd2
/dev/loop22

Check if fs is clean: 

# fsck.ext3 -n -v /dev/loop22
e2fsck 1.46.5 (30-Dec-2021)
MIRROR2: clean, 21243/36069376 files, 100445536/144254208 blocks
<syntaxhighlight>

mount fs in RO mode:
<syntaxhighlight>
# mount -o ro /dev/loop22 /mnt/mirror2/
Источник — https://wiki.wolf-a.ru/index.php?title=Mdadm&oldid=1084