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Ultra 6 - X-RAID 2 (dual redundancy) volume not expanding
Hi, My ReadyNAS Ultra 6 X-RAID2 (with dual redundancy) configuration was: /dev/sda = 2TB /dev/sdb = 3TB /dev/sdc = 2TB /dev/sdd = 3TB /dev/sde = 4TB (3TB assigned) /dev/sdf = 3TB This c...
After unmounting volume c I've resized the physical volume /dev/md3 (since the RAID6 array has already been expended) and extendend the logical volume with 1.82T. After that I've resized the ext4 filesystem on /dev/c/c:
pvresize /dev/md3 lvextend -L +1.82T -n /dev/c/c /dev/md3 resize2fs -pf /dev/c/c
Now is everything as I expected it to be:
df -h Filesystem Size Used Avail Use% Mounted on /dev/md0 4.0G 1.4G 2.5G 37% / tmpfs 16K 0 16K 0% /USB /dev/c/c 11T 8.8T 2.1T 82% /c
Device : /dev/md0 Create Time : 1422057868 Update Time : 1443276361 RAID Level : 1 RAID Capacity : 4193268 Disk Size : 4193268 Chunk Size : 0 Disks : 6 RAID Disks : 6 Active Disks : 6 Working Disks : 6 Failed Disks : 0 Spare Disks : 0 State : 1 [ Clean ] Disk Device RAID Disk Maj/Min Sectors State --------------------------------------------------------------------------- 3 /dev/sdd1 3 8/49 8388608 6 [ Active Sync ] 4 /dev/sdf1 4 8/81 8388608 6 [ Active Sync ] 5 /dev/sde1 5 8/65 8388608 6 [ Active Sync ] 6 /dev/sdb1 1 8/17 8388608 6 [ Active Sync ] 7 /dev/sda1 0 8/ 1 8388608 6 [ Active Sync ] 8 /dev/sdc1 2 8/33 8388608 6 [ Active Sync ] Device : /dev/md1 Create Time : 1422057869 Update Time : 1443275269 RAID Level : 6 RAID Capacity : 2096896 Disk Size : 524224 Chunk Size : 65536 Disks : 6 RAID Disks : 6 Active Disks : 6 Working Disks : 6 Failed Disks : 0 Spare Disks : 0 State : 1 [ Clean ] Disk Device RAID Disk Maj/Min Sectors State --------------------------------------------------------------------------- 3 /dev/sdd2 3 8/50 1048576 6 [ Active Sync ] 4 /dev/sdf2 4 8/82 1048576 6 [ Active Sync ] 5 /dev/sde2 5 8/66 1048576 6 [ Active Sync ] 6 /dev/sdb2 1 8/18 1048576 6 [ Active Sync ] 7 /dev/sda2 0 8/ 2 1048576 6 [ Active Sync ] 8 /dev/sdc2 2 8/34 1048576 6 [ Active Sync ] Device : /dev/md2 Create Time : 1422057869 Update Time : 1443275327 RAID Level : 6 RAID Capacity : 7795170816 Disk Size : 1948792704 Chunk Size : 65536 Disks : 6 RAID Disks : 6 Active Disks : 6 Working Disks : 6 Failed Disks : 0 Spare Disks : 0 State : 1 [ Clean ] Disk Device RAID Disk Maj/Min Sectors State --------------------------------------------------------------------------- 3 /dev/sdd3 3 8/51 3897587825 6 [ Active Sync ] 4 /dev/sdf3 4 8/83 3897587825 6 [ Active Sync ] 5 /dev/sde3 5 8/67 3897587825 6 [ Active Sync ] 6 /dev/sdb3 1 8/19 3897587825 6 [ Active Sync ] 7 /dev/sda3 0 8/ 3 3897587825 6 [ Active Sync ] 8 /dev/sdc3 2 8/35 3897587825 6 [ Active Sync ] Device : /dev/md3 Create Time : 1425388768 Update Time : 1443275265 RAID Level : 6 RAID Capacity : 1953501568 Disk Size : 976750784 Chunk Size : 65536 Disks : 4 RAID Disks : 4 Active Disks : 4 Working Disks : 4 Failed Disks : 0 Spare Disks : 0 State : 1 [ Clean ] Disk Device RAID Disk Maj/Min Sectors State --------------------------------------------------------------------------- 0 /dev/sdb4 0 8/20 1953503959 6 [ Active Sync ] 1 /dev/sdd4 1 8/52 1953503959 6 [ Active Sync ] 2 /dev/sdf4 2 8/84 1953503959 6 [ Active Sync ] 3 /dev/sde4 3 8/68 1953503959 6 [ Active Sync ]
***** partition output for sda ***** Disk /dev/sda: 7814037168 sectors, 3.6 TiB Logical sector size: 512 bytes Disk identifier (GUID): 76EE7EDB-3A00-4090-8FDD-7D66A76AB142 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 7814037134 Partitions will be aligned on 8-sector boundaries Total free space is 1953508133 sectors (931.5 GiB) Number Start (sector) End (sector) Size Code Name 1 64 8388671 4.0 GiB FD00 2 8388672 9437247 512.0 MiB FD00 3 9437248 3907025072 1.8 TiB FD00 4 3907025080 5860529038 931.5 GiB FD00 Disk /dev/sda: 486401 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sda1 0+ - 0- 2147483647+ ee EFI GPT /dev/sda2 0 - 0 0 0 Empty /dev/sda3 0 - 0 0 0 Empty /dev/sda4 0 - 0 0 0 Empty ***** partition output for sdb ***** Disk /dev/sdb: 5860533168 sectors, 2.7 TiB Logical sector size: 512 bytes Disk identifier (GUID): CB1B757F-1C9C-48FC-B52D-53B3E61E33B1 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 5860533134 Partitions will be aligned on 8-sector boundaries Total free space is 4133 sectors (2.0 MiB) Number Start (sector) End (sector) Size Code Name 1 64 8388671 4.0 GiB FD00 2 8388672 9437247 512.0 MiB FD00 3 9437248 3907025072 1.8 TiB FD00 4 3907025080 5860529038 931.5 GiB FD00 Disk /dev/sdb: 364801 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sdb1 0+ - 0- 2147483647+ ee EFI GPT /dev/sdb2 0 - 0 0 0 Empty /dev/sdb3 0 - 0 0 0 Empty /dev/sdb4 0 - 0 0 0 Empty ***** partition output for sdc ***** Disk /dev/sdc: 7814037168 sectors, 3.6 TiB Logical sector size: 512 bytes Disk identifier (GUID): 26850ED4-3BD9-4159-951D-CE703075D0BA Partition table holds up to 128 entries First usable sector is 34, last usable sector is 7814037134 Partitions will be aligned on 8-sector boundaries Total free space is 1953508133 sectors (931.5 GiB) Number Start (sector) End (sector) Size Code Name 1 64 8388671 4.0 GiB FD00 2 8388672 9437247 512.0 MiB FD00 3 9437248 3907025072 1.8 TiB FD00 4 3907025080 5860529038 931.5 GiB FD00 Disk /dev/sdc: 486401 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sdc1 0+ - 0- 2147483647+ ee EFI GPT /dev/sdc2 0 - 0 0 0 Empty /dev/sdc3 0 - 0 0 0 Empty /dev/sdc4 0 - 0 0 0 Empty ***** partition output for sdd ***** Disk /dev/sdd: 5860533168 sectors, 2.7 TiB Logical sector size: 512 bytes Disk identifier (GUID): D8A1E088-BFA7-4B1B-8E15-50AD0423FBAF Partition table holds up to 128 entries First usable sector is 34, last usable sector is 5860533134 Partitions will be aligned on 8-sector boundaries Total free space is 4133 sectors (2.0 MiB) Number Start (sector) End (sector) Size Code Name 1 64 8388671 4.0 GiB FD00 2 8388672 9437247 512.0 MiB FD00 3 9437248 3907025072 1.8 TiB FD00 4 3907025080 5860529038 931.5 GiB FD00 Disk /dev/sdd: 364801 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sdd1 0+ - 0- 2147483647+ ee EFI GPT /dev/sdd2 0 - 0 0 0 Empty /dev/sdd3 0 - 0 0 0 Empty /dev/sdd4 0 - 0 0 0 Empty ***** partition output for sde ***** Disk /dev/sde: 7814037168 sectors, 3.6 TiB Logical sector size: 512 bytes Disk identifier (GUID): 8AD8C6B1-0605-48ED-AFC7-196328709D28 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 7814037134 Partitions will be aligned on 8-sector boundaries Total free space is 1953508133 sectors (931.5 GiB) Number Start (sector) End (sector) Size Code Name 1 64 8388671 4.0 GiB FD00 2 8388672 9437247 512.0 MiB FD00 3 9437248 3907025072 1.8 TiB FD00 4 3907025080 5860529038 931.5 GiB FD00 Disk /dev/sde: 486401 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sde1 0+ - 0- 2147483647+ ee EFI GPT /dev/sde2 0 - 0 0 0 Empty /dev/sde3 0 - 0 0 0 Empty /dev/sde4 0 - 0 0 0 Empty ***** partition output for sdf ***** Disk /dev/sdf: 5860533168 sectors, 2.7 TiB Logical sector size: 512 bytes Disk identifier (GUID): DADEA7E4-B0AF-4CBF-A0E8-E4AA09E024C8 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 5860533134 Partitions will be aligned on 8-sector boundaries Total free space is 4133 sectors (2.0 MiB) Number Start (sector) End (sector) Size Code Name 1 64 8388671 4.0 GiB FD00 2 8388672 9437247 512.0 MiB FD00 3 9437248 3907025072 1.8 TiB FD00 4 3907025080 5860529038 931.5 GiB FD00 Disk /dev/sdf: 364801 cylinders, 255 heads, 63 sectors/track Units = cylinders of 8257536 bytes, blocks of 1024 bytes, counting from 0 Device Boot Start End #cyls #blocks Id System /dev/sdf1 0+ - 0- 2147483647+ ee EFI GPT /dev/sdf2 0 - 0 0 0 Empty /dev/sdf3 0 - 0 0 0 Empty /dev/sdf4 0 - 0 0 0 Empty
Did you try rebooting?
Also, there is an 8 TiB growth limit from the factory install (or the more recent factory default). Is it possible that you have reached that limit? Is there anything in the logs that suggests that expansion has failed?
Rebooting didn't solve my problem.
I've started with a capacity of 7.5TB, so the 8 TiB growth limit should not be a problem. The logs are not stating anything usefull, besides that it is trying to extend the logical volume by "0" bytes:
[2015/09/26 15:03:15 3419] LINE 4374: exec command: lvextend /dev/c/c -l +0 New size (148592 extents) matches existing size (148592 extents)
Since mdadm was showing that the partitions sda4 and sdc4 are not part of md3 (RAID 6), I'm now trying to add them manually:
mdadm --add /dev/md3 /dev/sda4 mdadm --add /dev/md3 /dev/sdc4 mdadm -v --grow --raid-devices=6 /dev/md3
Within 10 hours the restriping of md3 should be finished and hopefully I will be able to extend the logical volume after that.
cat /proc/mdstat Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] md3 : active raid6 sdc4[5] sda4[4] sdb4[0] sde4[3] sdf4[2] sdd4[1] 1953501568 blocks super 1.2 level 6, 64k chunk, algorithm 2 [6/6] [UUUUUU] [=====>...............] reshape = 27.2% (265943836/976750784) finish=590.4min speed=20062K/sec md2 : active raid6 sda3[7] sde3[5] sdf3[4] sdd3[3] sdc3[8] sdb3[6] 7795170816 blocks super 1.2 level 6, 64k chunk, algorithm 2 [6/6] [UUUUUU] md1 : active raid6 sda2[7] sde2[5] sdf2[4] sdd2[3] sdc2[8] sdb2[6] 2096896 blocks super 1.2 level 6, 64k chunk, algorithm 2 [6/6] [UUUUUU] md0 : active raid1 sda1[7] sde1[5] sdf1[4] sdd1[3] sdc1[8] sdb1[6] 4193268 blocks super 1.2 [6/6] [UUUUUU] unused devices: <none>After unmounting volume c I've resized the physical volume /dev/md3 (since the RAID6 array has already been expended) and extendend the logical volume with 1.82T. After that I've resized the ext4 filesystem on /dev/c/c:
pvresize /dev/md3 lvextend -L +1.82T -n /dev/c/c /dev/md3 resize2fs -pf /dev/c/c
Now is everything as I expected it to be:
df -h Filesystem Size Used Avail Use% Mounted on /dev/md0 4.0G 1.4G 2.5G 37% / tmpfs 16K 0 16K 0% /USB /dev/c/c 11T 8.8T 2.1T 82% /c
Is far as I know from answers around the internet, RAID 6 bij default needs at least 4 drives (of the same size, that is) to operate (which is strange as technically for dual reduncandy 3 should be enough). I guess if you added a 4th 4TB drive, it would have expanded as expected.
It's good to know one can manually override this behaviour.
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