====== RAID ====== Dokumentasi seputar RAID lengkap kami tulis disini ===== - Membuat RAID 1 SDC & SDD ===== Membuat raid array full size dan berikut ini tahapannya ==== - Format Hardisk ==== fdisk /dev/sdc ikuti opsi ini Command (m for help): n Command action e extended p primary partition (1-4) p Partition number (1-4): 1 First cylinder (1-8910, default 1): Using default value 1 Last cylinder or +size or +sizeM or +sizeK (1-8910, default 8910): ( langsung enter apabila full size ) Kemudian tampilkan hasilnya Command (m for help): p Disk /dev/sdc: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x000923aa Device Boot Start End Blocks Id System /dev/sdc1 1 30401 244196001 83 Linux Aktifkan partisi sebagai Raid Auto Detect Command (m for help): t Selected partition 1 Hex code (type L to list codes): fd Changed system type of partition 1 to fd (Linux raid autodetect) Command (m for help): p Disk /dev/sdc: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x000923aa Device Boot Start End Blocks Id System /dev/sdc1 1 30401 244196001 fd Linux raid autodetect Partition 1 does not start on physical sector boundary. Lakukan hal yang sama seperti diatas pada SDD ==== - Buat RAID Array ==== Lihat dulu partisi array yang ada pastikan jangan sampai bentrok cat /proc/mdstat hasilnya Personalities : [raid1] md1 : active raid1 sda3[0] sdb3[1] 306880 blocks super 1.1 [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 614336 blocks super 1.0 [2/2] [UU] md127 : active (auto-read-only) raid1 sda4[0] sdb4[1] 2826812224 blocks super 1.1 [2/2] [UU] resync=PENDING bitmap: 22/22 pages [88KB], 65536KB chunk md2 : active raid1 sdb2[1] sda2[0] 102334336 blocks super 1.1 [2/2] [UU] bitmap: 1/1 pages [4KB], 65536KB chunk anda bisa menggunakan misalnya md3 caranya mdadm --create /dev/md3 --level=1 --raid-devices=2 /dev/sdc1 /dev/sdd1 dan pantau perubahannya watch cat /proc/mdstat dan hasilnya Personalities : [raid1] md3 : active raid1 sdd1[1] sdc1[0] 244064896 blocks super 1.2 [2/2] [UU] [======>..............] resync = 34.6% (84689728/244064896) finish=19.7min speed=134492K/sec bitmap: 2/2 pages [8KB], 65536KB chunk md1 : active raid1 sda3[0] sdb3[1] 306880 blocks super 1.1 [2/2] [UU] md0 : active raid1 sda1[0] sdb1[1] 614336 blocks super 1.0 [2/2] [UU] md127 : active (auto-read-only) raid1 sda4[0] sdb4[1] 2826812224 blocks super 1.1 [2/2] [UU] resync=PENDING bitmap: 22/22 pages [88KB], 65536KB chunk md2 : active raid1 sdb2[1] sda2[0] 102334336 blocks super 1.1 [2/2] [UU] bitmap: 0/1 pages [0KB], 65536KB chunk ==== - Mengganti Hardisk RAid ==== Apabila anda sudah menambahkan hardisk baru /dev/sdb maka cara menambahkan hdd tsb ke raid adalah sbb Anda tidak perlu melakukan partisi satu per satu, untuk membuat partisi /dev/sdb sama dengan partisi /dev/sda anda bisa menggunakan perintah sfdisk berikut ini sfdisk -d /dev/sda | sfdisk /dev/sdb Selanjutnya lihat hasilnya dengan lsblk setelah anda yakin partisinya sama, selanjutnya tambahkan ke raid, misalnya mdadm --manage /dev/md0 --add /dev/sdb1 lakukan sesuai dengan partisi yang ada dalam raid. ==== Menghapus Raid ==== Berikut ini tahapan menghapus raid mdadm --stop /dev/md1 lalu mdadm --remove /dev/md1 jika anda mendapati error mdadm: error opening md1: No such file or directory maka lakukan mdadm --zero-superblock /dev/sdf1 /dev/sde1 sesuai disk raid anda ==== Mengaktifkan dan Mendisable Raid ==== mdadm --manage /dev/md1 --fail /dev/sdb2 baru ini mdadm --manage /dev/md1 --remove /dev/sdb2 mengaktifkan kembali mdadm -a /dev/md1 /dev/sdb2 ==== Menghentikan Raid Sync ==== echo "idle" > /sys/block/md0/md/sync_action ===== - Referensi ===== - http://www.cyberciti.biz/faq/centos-redhat-rhel-linux-setup-create-raid1/