群晖系统盘md0扩容
myluzh 发布于 阅读：12
可以看到md0 群晖系统盘 只有2898114624 blocks（约等于 2.4GB）成员组是sata2p1[12] sata6p1[16] sata5p1[13] sata4p1[15] sata3p1[14]
root@SA6400:/# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] [raidF1]
md2 : active raid5 sata2p3[4] sata5p3[5] sata4p3[2] sata3p3[1]
2898114624 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md3 : active raid1 sata6p3[0]
5849798208 blocks super 1.2 [1/1] [U]
md1 : active raid1 sata2p2[12] sata6p2[16] sata4p2[15] sata5p2[13] sata3p2[14]
2096128 blocks super 1.2 [12/5] [UUUUU_______]
md0 : active raid1 sata2p1[12] sata6p1[16] sata5p1[13] sata4p1[15] sata3p1[14]
2489216 blocks super 1.2 [12/5] [UUUUU_______]
unused devices: <none>查看所有物理设备，虽然每个物理分区 p1 确实是 8GB（16,777,216 sectors × 512 bytes），但 RAID 阵列没有使用分区的全部空间。
# 可以看到 sata2p1 sata6p1 sata5p1 sata4p1 sata3p1 其实都是8G
root@SA6400:/# fdisk -l /dev/sata?
Disk /dev/sata2: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000DM010-2EP102
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x41f2b7ea
Device Boot Start End Sectors Size Id Type
/dev/sata2p1 8192 16785407 16777216 8G fd Linux raid autodetect
/dev/sata2p2 16785408 20979711 4194304 2G fd Linux raid autodetect
/dev/sata2p3 21241856 1953320351 1932078496 921.3G fd Linux raid autodetect
Disk /dev/sata3: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000DM010-2EP102
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xedcbbbac
Device Boot Start End Sectors Size Id Type
/dev/sata3p1 8192 16785407 16777216 8G fd Linux raid autodetect
/dev/sata3p2 16785408 20979711 4194304 2G fd Linux raid autodetect
/dev/sata3p3 21241856 1953320351 1932078496 921.3G fd Linux raid autodetect
Disk /dev/sata4: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000DM010-2EP102
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xbdcf33c5
Device Boot Start End Sectors Size Id Type
/dev/sata4p1 8192 16785407 16777216 8G fd Linux raid autodetect
/dev/sata4p2 16785408 20979711 4194304 2G fd Linux raid autodetect
/dev/sata4p3 21241856 1953320351 1932078496 921.3G fd Linux raid autodetect
Disk /dev/sata5: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000DM010-2EP102
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xbcd081e2
Device Boot Start End Sectors Size Id Type
/dev/sata5p1 8192 16785407 16777216 8G fd Linux raid autodetect
/dev/sata5p2 16785408 20979711 4194304 2G fd Linux raid autodetect
/dev/sata5p3 21241856 1953320351 1932078496 921.3G fd Linux raid autodetect
Disk /dev/sata6: 5.5 TiB, 6001175126016 bytes, 11721045168 sectors
Disk model: HUS726T6TALE6L4
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: C9209603-1534-426C-9CFA-9BEFFE39C89F
Device Start End Sectors Size Type
/dev/sata6p1 8192 16785407 16777216 8G Linux RAID
/dev/sata6p2 16785408 20979711 4194304 2G Linux RAID
/dev/sata6p3 21241856 11720840351 11699598496 5.5T Linux RAID0x02 扩容
# 调整md0到最大可用容量
root@SA6400:/# mdadm --grow /dev/md0 --size=max
mdadm: component size of /dev/md0 has been set to 8387584K
# 扩容文件系统
root@SA6400:/# resize2fs /dev/md0
resize2fs 1.44.1 (24-Mar-2018)
Filesystem at /dev/md0 is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/md0 is now 2096896 (4k) blocks long.
# 可以看到已经生效， 现在 8,387,584 blocks (~8GB) ，等 resync 完成后检查
root@SA6400:/# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] [raidF1]
md2 : active raid5 sata2p3[4] sata5p3[5] sata4p3[2] sata3p3[1]
2898114624 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md3 : active raid1 sata6p3[0]
5849798208 blocks super 1.2 [1/1] [U]
md1 : active raid1 sata2p2[12] sata6p2[16] sata4p2[15] sata5p2[13] sata3p2[14]
2096128 blocks super 1.2 [12/5] [UUUUU_______]
md0 : active raid1 sata2p1[12] sata6p1[16] sata5p1[13] sata4p1[15] sata3p1[14]
8387584 blocks super 1.2 [12/5] [UUUUU_______]
[==========>..........] resync = 50.4% (4235392/8387584) finish=0.8min speed=79371K/sec
unused devices: <none>
# 完成
root@SA6400:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md0 7.9G 1.6G 5.9G 22% /