Linux
重建 Linux 軟體 Raid 10 添加替換磁碟
我有一個帶有 4 個 2TB 驅動器的 CentOS 6.10 伺服器。一個失敗（壞扇區並導致主要的磁碟 IO 瓶頸）。這是遠端數據中心中的無頭伺服器。技術人員將很快更換壞硬碟。我找出了壞驅動器 (/dev/sdb) 並將帶有驅動器的分區標記為故障，然後將其刪除。
mdadm /dev/md2 -f /dev/sdb2 mdadm /dev/md3 -f /dev/sdb3 mdadm /dev/md5 -f /dev/sdb5接下來，我使用 -r 標誌從集合中刪除驅動器：
mdadm /dev/md2 -r /dev/sdb2 mdadm /dev/md3 -r /dev/sdb3 mdadm /dev/md5 -r /dev/sdb5所以現在，這是我的cat /proc/mdstat：
Personalities : [raid1] [raid10] md2 : active raid1 sdd2[3] sda2[0] sdc2[2] 523200 blocks [4/3] [U_UU] md3 : active raid1 sda3[0] sdd3[3] sdc3[2] 102398912 blocks [4/3] [U_UU] md5 : active raid10 sdd5[3] sda5[0] sdc5[2] 3699072000 blocks 512K chunks 2 near-copies [4/3] [U_UU] bitmap: 27/28 pages [108KB], 65536KB chunk unused devices: <none>這是我的各種分區的詳細資訊：
mdadm –detail / dev / md2
Version : 0.90 Creation Time : Wed Nov 27 19:55:48 2019 Raid Level : raid1 Array Size : 523200 (510.94 MiB 535.76 MB) Used Dev Size : 523200 (510.94 MiB 535.76 MB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Thu Apr 9 01:07:31 2020 State : clean, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 UUID : 7c0d92f0:0c872155:a4d2adc2:26fd5302 Events : 0.65 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 2 0 0 2 removed 2 8 34 2 active sync /dev/sdc2 3 8 50 3 active sync /dev/sdd2mdadm –detail / dev / md3
/dev/md3: Version : 0.90 Creation Time : Wed Nov 27 19:55:49 2019 Raid Level : raid1 Array Size : 102398912 (97.66 GiB 104.86 GB) Used Dev Size : 102398912 (97.66 GiB 104.86 GB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 3 Persistence : Superblock is persistent Update Time : Thu Apr 9 23:25:07 2020 State : clean, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 UUID : 87473072:b4d350c2:a4d2adc2:26fd5302 Events : 0.22932 Number Major Minor RaidDevice State 0 8 3 0 active sync /dev/sda3 2 0 0 2 removed 2 8 35 2 active sync /dev/sdc3 3 8 51 3 active sync /dev/sdd3mdadm –detail / dev / md5
/dev/md5: Version : 0.90 Creation Time : Wed Nov 27 19:55:51 2019 Raid Level : raid10 Array Size : 3699072000 (3527.71 GiB 3787.85 GB) Used Dev Size : 1849536000 (1763.85 GiB 1893.92 GB) Raid Devices : 4 Total Devices : 3 Preferred Minor : 5 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Thu Apr 9 23:24:47 2020 State : clean, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : near=2 Chunk Size : 512K UUID : 256cd09b:989c40e7:a4d2adc2:26fd5302 Events : 0.246450 Number Major Minor RaidDevice State 0 8 5 0 active sync set-A /dev/sda5 2 0 0 2 removed 2 8 37 2 active sync set-A /dev/sdc5 3 8 53 3 active sync set-B /dev/sdd5fdisk -l /dev/sda
fdisk -l /dev/sda WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sda1 1 243202 1953514583+ ee GPT筆記：
/dev/md2 Partition: /boot /dev/md3 Partition: / /dev/md5 Partition: /vz (This is an OpevVZ Server running SolusVM)需要讓我把這個驅動器正確地重新投入使用。
這是正確的程序。值得注意的是 sgdisk -R 命令的順序。首先是目的地，然後是來源。
複製分區表：
sgdisk -R /dev/sdb /dev/sda隨機化 GUID
sgdisk -G /dev/sdb檢查分區表是否相同：
sgdisk -p /dev/sda sgdisk -p /dev/sdb sgdisk -p /dev/sdc sgdisk -p /dev/sdd重新添加磁碟：
mdadm --manage /dev/md2 --add /dev/sdb2 mdadm --manage /dev/md3 --add /dev/sdb3 mdadm --manage /dev/md5 --add /dev/sdb5