Resize root lvm partition
No, not safely. From what I have read, the VG must be available (vgchange --available y
, but not mounted). I recommend that you boot from a liveCD or USB so that you have tools loaded into memory, but all of your filesystems not mounted.
Check the file system, we don't want to resize something in an inconsistent state
e2fsck -f /dev/s93079-vg/root
Resize the actual filesystem, a little smaller than the final target.
resize2fs /dev/s93079-vg/root 90G
Now, shrink the LVM to the desired size
lvreduce -L 100G /dev/s93079-vg/root
Finally, grow the the root filesystem to match the target LVM volume
resize2fs /dev/s93079-vg/root
While I browsed several guides, the most helpful blog I found on the topic was https://blog.shadypixel.com/how-to-shrink-an-lvm-volume-safely/
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Pranav
Updated on September 18, 2022Comments
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Pranav over 1 year
I have a dedicated server with 2 TB storage.
My problem is that the whole storage is allotted to the root partition.
Whenever I try to resize it using
lvresize
, the root partition gets corrupted and then I have to reprovision the server.Is there any option to resize the root partition without unmounting in lvm? I am trying to reduce the root partition to 100GB.
Vgs
root@s93079:/home/customer# vgs VG #PV #LV #SN Attr VSize VFree s93079-vg 1 2 0 wz--n- 1.82t 0
Lvs
LV VG Attr LSize Pool Origin Data% Meta % Move Log Cpy%Sync Convert root s93079-vg -wi-ao---- 1.79t swap_1 s93079-vg -wi-ao---- 32.00g
Fdisk - l
Device Boot Start End Sectors Size Id Type /dev/sda1 * 2048 499711 497664 243M 83 Linux /dev/sda2 501758 3907028991 3906527234 1.8T 5 Extend /dev/sda5 501760 3907028991 3906527232 1.8T 8e Linux Disk /dev/mapper/s93079--vg-root: 1.8 TiB, 1965782204416 byt es, 3839418368 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/mapper/s93079--vg-swap_1: 32 GiB, 34355544064 byte s, 67100672 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
Vgdisplay
--- Volume group --- VG Name s93079-vg System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 1.82 TiB PE Size 4.00 MiB Total PE 476870 Alloc PE / Size 476870 / 1.82 TiB Free PE / Size 0 / 0 VG UUID dPrEwA-77pM-pGai-9jZB-ldMZ-iL20-HAe9 Dj
lvdisplay /dev/s93079-vg/root
--- Logical volume --- LV Path /dev/s93079-vg/root LV Name root VG Name s93079-vg LV UUID bpGNau-XirV-P7PA-8d6k-OCOy-TAwN-HXl FVI LV Write Access read/write LV Creation host, time s93079, 2016-08-27 09:22:05 -0500 LV Status available # open 1 LV Size 1.79 TiB Current LE 468679 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:0
Lvdisplay /dev/s93079-vg/swap_1
--- Logical volume --- LV Path /dev/s93079-vg/swap_1 LV Name swap_1 VG Name s93079-vg LV UUID j74PLZ-E9gK-9Bbb-EkKq-xRJv-TuU4-FgH gm LV Write Access read/write LV Creation host, time s93079, 2016-08-27 09:22:05 -0500 LV Status available # open 2 LV Size 32.00 GiB Current LE 8191 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 254:1
Df - h
/dev/dm-0 1.8T 923M 1.7T 1% / udev 10M 0 10M 0% /dev tmpfs 3.2G 8.5M 3.2G 1% /run tmpfs 7.9G 0 7.9G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 7.9G 0 7.9G 0% /sys/fs/cgroup /dev/sda1 236M 33M 191M 15% /boot
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Stephen Harris over 7 yearsYou may wish to add the output of
vgs,
lvs` andfdisk -l
to your question (edit the question, don't post it as a comment). -
gogoud over 7 yearswhen you say resize do you mean you are trying to make root filesystem smaller?
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Pranav over 7 yearsYes i would like to reduce root partition to 100 gb
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Intey over 5 yearsWithout unmount it's may corrupt you drive. There blog post, where author resize root by ssh with unmount, from tmpfs: ivarch.com/blogs/oss/2007/01/… It's approach can be handy, when you not have livecd. P. S. I didn't try this instruction, so if you gonna do it, don't forget about backup.
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Pranav over 7 yearsMy problem is since this is a dedicated server I am unable to boot this from a liveCD or USB
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Clayton over 7 years@Pranav Ok, I'm not sure if this question is really a duplicate - but have you looked at unix.stackexchange.com/a/227318 ?