리눅스 UUID 로 디스크 추가 / 삭제

리눅스 UUID 로 디스크 추가 / 삭제

UUID는 센트오에스6에서 처름본 개념같은데 장치들을 구분하기 위한 고유한 값이라고 생각된다.

디스크를 예를 들면 /dev/sda , /dev/sdb 이런식으로 구분되는데 하드디스크가 1개 사용하는 경우는 상관없지만

2개 이상 사용하는 경우 헷갈리거나 꼬여버리는 경우 정리가 힘들다고 한다.

UUID 생성하기

: 그냥 단순히 UUID 하나를 생성해주는 명령어 인듯 하다.

[root@iwinvhelper-303 ~]# uuidgen ccc08845-72c9-4850-ace5-1447b6dcb169

UUID 보기

[root@iwinvhelper-303 ~]# blkid /dev/vda1: UUID="ad11bafe-de2c-4d3f-be13-51dd0ef0d819" TYPE="ext4"

UUID로 마운트 하기

mount UUID="aab38e85-1ff1-4403-bd3d-b57fb42f671c" /mnt

UUID로 언마운트 하기

umount UUID="aab38e85-1ff1-4403-bd3d-b57fb42f671c"

UUID 변경하기 (UUID로 사용할 값을 uuidgen 명령어로 하나 생성한다)

tune2fs -U eafec66f-d257-4605-a5ed-cf36fbb195c4 /dev/sdb1

디스크를 하나 추가한 후 파티션 잡기랑 포맷까지 하기

[root@iwinvhelper-303 ~]# fdisk -l Disk /dev/vda: 26.8 GB, 26843545600 bytes 139 heads, 8 sectors/track, 47148 cylinders Units = cylinders of 1112 * 512 = 569344 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000594e0    Device Boot      Start         End      Blocks   Id  System /dev/vda1               2       47149    26213376   83  Linux Disk /dev/vdb: 10.7 GB, 10737418240 bytes 16 heads, 63 sectors/track, 20805 cylinders Units = cylinders of 1008 * 512 = 516096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 [root@iwinvhelper-303 ~]# fdisk /dev/vdb Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel Building a new DOS disklabel with disk identifier 0xed87bffb. Changes will remain in memory only, until you decide to write them. After that, of course, the previous content won't be recoverable. Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite) WARNING: DOS-compatible mode is deprecated. It's strongly recommended to          switch off the mode (command 'c') and change display units to          sectors (command 'u'). Command (m for help): n Command action    e   extended    p   primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-20805, default 1): (엔터) Using default value 1 Last cylinder, +cylinders or +size{K,M,G} (1-20805, default 20805): (엔터) Using default value 20805 Command (m for help): wq The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks. [root@iwinvhelper-303 ~]# mkfs.ext4 /dev/vdb1 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 655360 inodes, 2621422 blocks 131071 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=2684354560 80 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks:         32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 28 mounts or 180 days, whichever comes first.  Use tune2fs -c or -i to override. [root@iwinvhelper-303 ~]# blkid /dev/vda1: UUID="ad11bafe-de2c-4d3f-be13-51dd0ef0d819" TYPE="ext4" /dev/vdb1: UUID="dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7" TYPE="ext4"

/etc/fstab 라인 추가

UUID=ad11bafe-de2c-4d3f-be13-51dd0ef0d819 /                       ext4    defaults        1 1 UUID=dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7 /mnt                 ext4,nofail    defaults        0 1 tmpfs                   /dev/shm                tmpfs   defaults        0 0 devpts                  /dev/pts                devpts  gid=5,mode=620  0 0 sysfs                   /sys                    sysfs   defaults        0 0 proc                    /proc                   proc    defaults        0 0

/etc/rc.d/rc.local 라인추가 (fstab 에 넣는것이 정석이고 이 방법으로 하는 사람도 있는듯 하다)

mount UUID="dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7" /mnt

어쨋든 파티션은 잡힌다.

[root@iwinvhelper-303 ~]# df -Th Filesystem     Type   Size  Used Avail Use% Mounted on /dev/vda1      ext4    25G  687M   23G   3% / tmpfs          tmpfs  246M     0  246M   0% /dev/shm /dev/vdb1      ext4   9.8G   23M  9.2G   1% /mnt

UUID 가 겹치는 경우

[root@iwinvhelper-303 ~]# blkid /dev/vda1: UUID="ad11bafe-de2c-4d3f-be13-51dd0ef0d819" TYPE="ext4" /dev/vdb1: UUID="dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7" TYPE="ext4" /dev/vdc1: UUID="dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7" TYPE="ext4" /dev/vdd1: UUID="dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7" TYPE="ext4" [root@iwinvhelper-303 ~]# uuidgen d1a3cf37-a838-4cbb-a4b6-895c540f421c [root@iwinvhelper-303 ~]# tune2fs -U d1a3cf37-a838-4cbb-a4b6-895c540f421c /dev/vdc1 tune2fs 1.41.12 (17-May-2010) [root@iwinvhelper-303 ~]# uuidgen d73a2cf2-2488-42d1-b737-86cfa5559702 [root@iwinvhelper-303 ~]# tune2fs -U d73a2cf2-2488-42d1-b737-86cfa5559702 /dev/vdd1 tune2fs 1.41.12 (17-May-2010) [root@iwinvhelper-303 ~]# blkid /dev/vda1: UUID="ad11bafe-de2c-4d3f-be13-51dd0ef0d819" TYPE="ext4" /dev/vdb1: UUID="dc9dce12-d89c-40a4-8261-8bd2c0ed7bc7" TYPE="ext4" /dev/vdc1: UUID="d1a3cf37-a838-4cbb-a4b6-895c540f421c" TYPE="ext4" /dev/vdd1: UUID="d73a2cf2-2488-42d1-b737-86cfa5559702" TYPE="ext4" [root@iwinvhelper-303 ~]#

드라이브를 포맷하면 UUID는 변경된다.

[root@iwinvhelper-833 ~]# blkid /dev/vda1: UUID="ad11bafe-de2c-4d3f-be13-51dd0ef0d819" TYPE="ext4" /dev/vdb1: UUID="109a4789-4111-4cb6-9dc4-3bb9e8fd85a6" TYPE="ext4" /dev/vdc1: UUID="906672d4-2765-4dde-a66d-7f40aea5bc89" TYPE="ext4" /dev/vdd1: UUID="29a387ab-6536-4574-a8b4-8035f9c195b7" TYPE="ext4" [root@iwinvhelper-833 ~]# mkfs.ext4 /dev/vdd1 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 1966080 inodes, 7864282 blocks 393214 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 240 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks:         32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,         4096000 Writing inode tables: done Creating journal (32768 blocks): done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 27 mounts or 180 days, whichever comes first.  Use tune2fs -c or -i to override. [root@iwinvhelper-833 ~]# blkid /dev/vda1: UUID="ad11bafe-de2c-4d3f-be13-51dd0ef0d819" TYPE="ext4" /dev/vdb1: UUID="109a4789-4111-4cb6-9dc4-3bb9e8fd85a6" TYPE="ext4" /dev/vdc1: UUID="906672d4-2765-4dde-a66d-7f40aea5bc89" TYPE="ext4" /dev/vdd1: UUID="41c01ef7-eb16-42cd-b1c1-d0b63e0d8638" TYPE="ext4"