Gentoo Archives: gentoo-user

From: Julien Roy <julien@××××.ca>
To: Gentoo User <gentoo-user@l.g.o>
Subject: [gentoo-user] Unable to expand ext4 partition
Date: Sat, 05 Feb 2022 17:43:58
1 Hello,
3 I've been running an LVM RAID 5 on my home lab for a while, and recently it's been getting awfully close to 100% full, so I decided to buy a new drive to add to it, however, growing an LVM RAID is more complicated than I thought! I found very few documentation on how to do this, and settled on following some user's notes on the Arch Wiki [0]. I should've used mdadm !...
4 My RAID 5 consisted of 3x6TB drives giving me a total of 12TB of usable space. I am trying to grow it to 18TB now (4x6TB -1 for parity).
5 I seem to have done everything in order since I can see all 4 drives are used when I run the vgdisplay command, and lvdisplay tells me that there is 16.37TB of usable space in the logical volume.
6 In fact, running fdisk -l on the lv confirms this as well :
7 Disk /dev/vgraid/lvraid: 16.37 TiB
9 However, the partition on it is still at 12TB (or a little bit less in HDD units) and I am unable to expand it.
10 When I run the resize2fs command on the logical volume, I can see that it's doing something, and I can hear the disks doing HDD noises, but after just a few minutes (perhaps seconds), the disks turn quiet, and then a few more minutes later, resize2fs halts with the following error:
11 doas resize2fs /dev/vgraid/lvraid
12 resize2fs 1.46.4 (18-Aug-2021)
13 Resizing the filesystem on /dev/vgraid/lvraid to 4395386880 (4k) blocks.
14 resize2fs: Input/output error while trying to resize /dev/vgraid/lvraid
15 Please run 'e2fsck -fy /dev/vgraid/lvraid' to fix the filesystem
16 after the aborted resize operation.
18 A few seconds after the resize2fs gives the "input/output" error, I can see the following lines appearing multiple times in dmesg:
19 Feb  5 12:35:50 gentoo kernel: Buffer I/O error on dev dm-8, logical block 2930769920, lost async page write
21 At first I was worried about data corruption or a defective drive, but I ran a smartctl test on all 4 drives and they all turn out healthy. Also, I am still capable of mounting the LVM partition and accessing all the data without any issue.
22 I have then tried running the e2fsck command as instructed, which fixes some things [1], and then running the resize2fs command again, but it does the same thing every time.
24 My Google skills seem to not be good enough for this one so I am hoping someone else here has an idea what is wrong...
26 Thanks !
27 Julien
29 [0]
30 [1] doas e2fsck -fy /dev/vgraid/lvraid
31 e2fsck 1.46.4 (18-Aug-2021)
32 Resize inode not valid.  Recreate? yes
34 Pass 1: Checking inodes, blocks, and sizes
35 Inode 238814586 extent tree (at level 1) could be narrower.  Optimize? yes
37 Pass 1E: Optimizing extent trees
38 Pass 2: Checking directory structure
39 Pass 3: Checking directory connectivity
40 Pass 4: Checking reference counts
41 Pass 5: Checking group summary information
42 Block bitmap differences:  -(2080--2096) +(2304--2305) +(2307--2321)
43 Fix? yes
45 Free blocks count wrong for group #0 (1863, counted=1864).
46 Fix? yes
49 /dev/vgraid/lvraid: ***** FILE SYSTEM WAS MODIFIED *****
50 /dev/vgraid/lvraid: 199180/366284800 files (0.8% non-contiguous), 2768068728/2930257920 blocks


Subject Author
Re: [gentoo-user] Unable to expand ext4 partition Wol <antlists@××××××××××××.uk>