Untuk membuat RAID5 dibutuhkan minimal 3 hardisk, beberapa alasan saya memilih menggunakan RAID 5
– hardisk hanya ada 3 ;)
– bila 1 hardisk yang rusak, masih bisa di rebuild.
– Kecepatan baca/tulis tidak terlalu berpengaruh karna digunakan untuk HTPC (Kodi/XBMC) dan backup data
Spesifikasi Komputer
CentOS 7 64 Bit Memory 32 GB Hardisk 1 : Kingfast 128 GB (untuk OS) Hardisk 2 : 3x WD Green 2 TB
Partisi tiap hardisk jadi EXT4 dengan gparted
klik kanan di Partition, pilih New
Di tampilan Create New Partition langsung klik Add
klik Apply all partition agar perubahan dijalankan
Partisi selesai
Partisi juga kedua hardisk lainnya dengan cara diatas.
Membuat RAID 5
pastikan anda memilih hardisk yang benar, untuk memastikannya cek lagi dengan fdisk -l
Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk label type: dos Disk identifier: 0x0007153a Device Boot Start End Blocks Id System /dev/sda1 2048 3907028991 1953513472 83 Linux Disk /dev/sdd: 128.0 GB, 128035676160 bytes, 250069680 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: dos Disk identifier: 0x00040512 Device Boot Start End Blocks Id System /dev/sdd1 * 2048 1026047 512000 83 Linux /dev/sdd2 1026048 250068991 124521472 8e Linux LVM Disk /dev/sdc: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk label type: dos Disk identifier: 0x0000a156 Device Boot Start End Blocks Id System /dev/sdc1 2048 3907028991 1953513472 83 Linux Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk label type: dos Disk identifier: 0x000bf894 Device Boot Start End Blocks Id System /dev/sdb1 2048 3907028991 1953513472 83 Linux Disk /dev/mapper/cl-root: 53.7 GB, 53687091200 bytes, 104857600 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/cl-swap: 3892 MB, 3892314112 bytes, 7602176 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/cl-home: 69.9 GB, 69860327424 bytes, 136445952 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
disana kelihatan hardisk yang akan dijadikan RAID5 ada di /dev/sda1 /dev/sdb1 /dev/sdc1.
buat partisi RAID 5
mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sd[abc]1
setelah perintah diatas dijalankan, partisi RAID akan dibuat. Proses ini bisa berlangsung lama, status pembuatan RAID ini bisa dilihat dengan
cat /proc/mdstat ## output md0 : active raid5 sdc1[3] sdb1[1] sda1[0] 3906764800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_] [>....................] recovery = 1.4% (29038108/1953382400) finish=252.4min speed=127019K/sec bitmap: 0/15 pages [0KB], 65536KB chunk