群晖硬盘脱机很久再返回使用
Panasonic@Panasonic-PROJECT:/$ sudo fdisk -l | grep sata1
Disk /dev/sata1: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
/dev/sata1p1 8192 16785407 16777216 8G Linux RAID
/dev/sata1p2 16785408 20979711 4194304 2G Linux RAID
/dev/sata1p5 21257952 7813843231 7792585280 3.6T Linux RAID
Panasonic@Panasonic-PROJECT:/$ sudo fdisk -l | grep sata
Disk /dev/sata1: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
/dev/sata1p1 8192 16785407 16777216 8G Linux RAID
/dev/sata1p2 16785408 20979711 4194304 2G Linux RAID
/dev/sata1p5 21257952 7813843231 7792585280 3.6T Linux RAID
Disk /dev/sata2: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
/dev/sata2p1 8192 16785407 16777216 8G fd Linux raid autodetect
/dev/sata2p2 16785408 20979711 4194304 2G fd Linux raid autodetect
/dev/sata2p3 21241856 1953523967 1932282112 921.4G f W95 Ext'd (LBA)
/dev/sata2p5 21257952 1953331231 1932073280 921.3G fd Linux raid autodetect
Panasonic@Panasonic-PROJECT:/$ cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sata2p5[0]
966035584 blocks super 1.2 [2/1] [U_]
md2 : active raid1 sata1p5[0]
3896291584 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sata2p2[1]
2097088 blocks [2/1] [_U]
md0 : active raid1 sata2p1[1]
8388544 blocks [2/1] [_U]
unused devices: <none>
此时需要重新同步系统分区1,2到md0,1 对应好大小
Panasonic@Panasonic-PROJECT:/$ sudo mdadm -a /dev/md0 /dev/sata1p1
mdadm: added /dev/sata1p1
Panasonic@Panasonic-PROJECT:/$ sudo mdadm -a /dev/md1 /dev/sata1p2
mdadm: added /dev/sata1p2
然后查看进度：
cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sata2p5[0]
966035584 blocks super 1.2 [2/1] [U_]
md2 : active raid1 sata1p5[0]
3896291584 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sata1p2[2] sata2p2[1]
2097088 blocks [2/1] [_U]
[==>..................] recovery = 14.3% (301824/2097088) finish=2.8min speed=10407K/sec
md0 : active raid1 sata1p1[2] sata2p1[1]
8388544 blocks [2/1] [_U]
[=>...................] recovery = 6.3% (536000/8388544) finish=12.9min speed=10121K/sec
再看：
cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sata2p5[0]
966035584 blocks super 1.2 [2/1] [U_]
md2 : active raid1 sata1p5[0]
3896291584 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sata1p2[0] sata2p2[1]
2097088 blocks [2/2] [UU]
md0 : active raid1 sata1p1[2] sata2p1[1]
8388544 blocks [2/1] [_U]
[===================>.] recovery = 99.8% (8377088/8388544) finish=0.0min speed=10342K/sec
再看：
$ cat /proc/mdstat
Personalities : [raid1]
md3 : active raid1 sata2p5[0]
966035584 blocks super 1.2 [2/1] [U_]
md2 : active raid1 sata1p5[0]
3896291584 blocks super 1.2 [2/1] [U_]
md1 : active raid1 sata1p2[0] sata2p2[1]
2097088 blocks [2/2] [UU]
md0 : active raid1 sata1p1[0] sata2p1[1]
8388544 blocks [2/2] [UU]
ok 结束。