Difference between revisions of "Mdadm"
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(→Create) |
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for i in $( seq 1 9 ); do |
for i in $( seq 1 9 ); do |
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dd if=/dev/zero of=${DISK_DIR}/disk${i} bs=100M count=1 |
dd if=/dev/zero of=${DISK_DIR}/disk${i} bs=100M count=1 |
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[ ! - |
[ ! -e /dev/loop${i} -a ! -b /dev/loop${i} ] && mknod -m 660 /dev/loop${i} b 7 ${i} |
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losetup /dev/loop${i} ${DISK_DIR}/disk${i} |
losetup /dev/loop${i} ${DISK_DIR}/disk${i} |
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done |
done |
Revision as of 20:59, 10 June 2012
Create
Create environment
DISK_DIR=/var/tmp/disks mkdir -p ${DISK_DIR} for i in $( seq 1 9 ); do dd if=/dev/zero of=${DISK_DIR}/disk${i} bs=100M count=1 [ ! -e /dev/loop${i} -a ! -b /dev/loop${i} ] && mknod -m 660 /dev/loop${i} b 7 ${i} losetup /dev/loop${i} ${DISK_DIR}/disk${i} done
Create raid0 device
# mdadm --create /dev/md0 --level raid0 -n 2 /dev/loop[1-2]
Create raid1 with one spare
# mdadm --create /dev/md1 --level raid1 -n 2 -x 1 /dev/loop[3-5]
Create raid5 with one spare
# mdadm --create /dev/md5 --level raid5 -n 3 -x 1 /dev/loop[6-9]
Check the status
# cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [raid0] [raid1] md5 : active raid5 loop8[2] loop9[3](S) loop7[1] loop6[0] 204672 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] md0 : active raid0 loop2[1] loop1[0] 204672 blocks 64k chunks md1 : active raid1 loop5[2](S) loop4[1] loop3[0] 102336 blocks [2/2] [UU] unused devices: <none>
Manage
Fail and remove disk
# mdadm /dev/md5 --fail /dev/loop6 --remove /dev/loop6
Add disk
# mdadm /dev/md5 --add /dev/loop6
Destroy
# mdadm --stop /dev/md0 # mdadm --stop /dev/md1 # mdadm --stop /dev/md5 # mdadm --remove /dev/md0 # mdadm --remove /dev/md1 # mdadm --remove /dev/md5
Config file
# mdadm --detail --scan >> /etc/mdadm.conf # cat /etc/mdadm.conf ARRAY /dev/md1 metadata=0.90 spares=1 UUID=a79ea43f:46f4c907:b40a34a0:8cfeb653 ARRAY /dev/md0 metadata=0.90 UUID=c3d6c5a6:b0d1c032:b40a34a0:8cfeb653 ARRAY /dev/md5 metadata=0.90 spares=1 UUID=b6aeae37:58c17516:b40a34a0:8cfeb653
Sample config file
DEVICE /dev/sd[bcdjkl]1 DEVICE /dev/hda1 /dev/hdb1 # /dev/md0 is known by its UUID. ARRAY /dev/md0 UUID=3aaa0122:29827cfa:5331ad66:ca767371 # /dev/md1 contains all devices with a minor number of # 1 in the superblock. ARRAY /dev/md1 superminor=1 # /dev/md2 is made from precisely these two devices ARRAY /dev/md2 devices=/dev/hda1,/dev/hdb1 # /dev/md4 and /dev/md5 are a spare-group and spares # can be moved between them ARRAY /dev/md4 uuid=b23f3c6d:aec43a9f:fd65db85:369432df spare-group=group1 ARRAY /dev/md5 uuid=19464854:03f71b1b:e0df2edd:246cc977 spare-group=group1 # /dev/md/home is created if need to be a partitionable md array # any spare device number is allocated. ARRAY /dev/md/home UUID=9187a482:5dde19d9:eea3cc4a:d646ab8b auto=part MAILADDR root@mydomain.tld PROGRAM /usr/sbin/handle-mdadm-events CREATE group=system mode=0640 auto=part-8 HOMEHOST <system> AUTO +1.x -all