We have a Synology RS3614rpxs NAS head containing (9) 3TB hard drives in a RAID 6 + 1 hot spare. The storage became exhausted and we added an expansion chassis where 5TB hard drivers were installed with the intention of creating a second array (also, RAID 6).
Synology appears to be use standard linux md
to form RAID arrays withLVM
on top to form volume groups (comprised of underlying md
devices) and then logical volumes.
During the introduction of the expansion chassis, 3 of the disks were accidentally added to the first array (md2
). A problem as we are losing usable space on the 5TB disks. The remaining disks appear to have been added to a second array (md3
). md3
appears to have been added to the existing volume group vg1.
Our objectives:
- Remove
md3
fromvg1
and resize logical volume if necessary. - Destroy
md3
and make its disks available to be repurposed.
QUESTION: How might we best accomplish these objectives?
For Context:
Output of "df -h"
Filesystem Size Used Available Use% Mounted on
/dev/md0 2.3G 637.9M 1.6G 28% /
/tmp 1.9G 404.0K 1.9G 0% /tmp
/run 1.9G 3.8M 1.9G 0% /run
/dev/shm 1.9G 0 1.9G 0% /dev/shm
/dev/vg1/volume_3 2.4T 1.2T 1.2T 49% /volume3
/dev/vg1/volume_1 5.8T 2.9T 2.9T 49% /volume1
/dev/vg1/volume_2 10.7T 10.2T 443.5G 96% /volume2
Output of "lvdisplay"
--- Logical volume ---
LV Name /dev/vg1/syno_vg_reserved_area
VG Name vg1
LV UUID agGo1D-0811-miWz-ro0e-Nsvo-YdO9-XRJQY4
LV Write Access read/write
LV Status available
# open 0
LV Size 12.00 MB
Current LE 3
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 384
Block device 253:0
--- Logical volume ---
LV Name /dev/vg1/volume_1
VG Name vg1
LV UUID 3oehZK-Bv5V-T1RL-MWfY-VQnh-tsrr-tXn3v9
LV Write Access read/write
LV Status available
# open 1
LV Size 5.86 TB
Current LE 1536000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 4096
Block device 253:1
--- Logical volume ---
LV Name /dev/vg1/volume_2
VG Name vg1
LV UUID 3VMQE8-BG0Y-K0jC-Y2Rz-ID09-0dAs-XqTavU
LV Write Access read/write
LV Status available
# open 1
LV Size 10.74 TB
Current LE 2816000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 4096
Block device 253:2
--- Logical volume ---
LV Name /dev/vg1/volume_3
VG Name vg1
LV UUID mGs4IT-7QM8-PFF2-TD3O-SGzo-QaKp-33DrrW
LV Write Access read/write
LV Status available
# open 1
LV Size 2.47 TB
Current LE 647706
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 4096
Block device 253:3
Output of "vgdisplay"
--- Volume group ---
VG Name vg1
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 9
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 3
Max PV 0
Cur PV 2
Act PV 2
VG Size 40.88 TB
PE Size 4.00 MB
Total PE 10715889
Alloc PE / Size 4999709 / 19.07 TB
Free PE / Size 5716180 / 21.81 TB
VG UUID 9i82gX-6djB-1KC3-jbZK-nEJ2-9jJh-KvNgJp
Output of "pvdisplay"
pvdisplay
--- Physical volume ---
PV Name /dev/md2
VG Name vg1
PV Size 27.25 TB / not usable 3.56 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 7142441
Free PE 2142732
Allocated PE 4999709
PV UUID SmZrd0-jC5T-2QwU-Ecnh-PuY0-O9u6-sqDW1E
--- Physical volume ---
PV Name /dev/md3
VG Name vg1
PV Size 13.63 TB / not usable 1.62 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 3573448
Free PE 3573448
Allocated PE 0
PV UUID aQmMu2-gg8j-Be1T-IofO-bOuk-aL0s-ysiR6j