>>>>> "Marcus" == Marcus Lell <marcus.lell@xxxxxxxxx> writes: Marcus> after reinstalling gentoo on my main system, I had to find Marcus> out, that my clean raid5 has been resized from ca. 18,2TB to Marcus> ca. 2,2 TB . I don't have any clue, why.. How full was your array before? And what filesystem are you using on there? Does the filesystem pass 'fsck' checks? And did you lose any data that you know of? Can you show us the output of: cat /proc/partitions because it sounds like you're disks got messed up somewhere. Hmm... did you use the full disks before by any chance? /dev/sdb, /dev/sdc and /dev/sdd instead of /dev/sdb1, sdc1 and sdd1? That might be the problem. If the partitions are too small, what I might do is: 0. don't panic! And don't do anything without thinking and taking your time. 1. stop the array completely. 2. goto the RAID wiki and look at the instructions for how to setup overlays, so you dont' write to your disks while expermienting. https://raid.wiki.kernel.org/index.php/Linux_Raid 3. Examine sdb, and compare it with sdb1. See the difference? You might have done whole disk setup, instead of using partitions. mdadm -E /dev/sdb 4. Check your partitioning. It might be possible (if this is the problem) to just extend your paritions to the end of the disk, and then re-mount your disks. Good luck! Let us know what you find. John Marcus> First, the array gets assembled successfully. Marcus> lxcore ~ # cat /proc/mdstat Marcus> Personalities : [raid1] [raid6] [raid5] [raid4] Marcus> md0 : active raid5 sdd1[2] sdb1[1] sdc1[0] Marcus> 2352740224 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU] Marcus> bitmap: 0/9 pages [0KB], 65536KB chunk Marcus> unused devices: <none> Marcus> lxcore ~ # mdadm --detail /dev/md0 Marcus> /dev/md0: Marcus> Version : 1.2 Marcus> Creation Time : Sat Nov 10 23:04:14 2018 Marcus> Raid Level : raid5 Marcus> Array Size : 2352740224 (2243.75 GiB 2409.21 GB) Marcus> Used Dev Size : 1176370112 (1121.87 GiB 1204.60 GB) Marcus> Raid Devices : 3 Marcus> Total Devices : 3 Marcus> Persistence : Superblock is persistent Marcus> Intent Bitmap : Internal Marcus> Update Time : Tue Jan 12 14:58:40 2021 Marcus> State : clean Marcus> Active Devices : 3 Marcus> Working Devices : 3 Marcus> Failed Devices : 0 Marcus> Spare Devices : 0 Marcus> Layout : left-symmetric Marcus> Chunk Size : 64K Marcus> Consistency Policy : bitmap Marcus> Name : lxcore:0 (local to host lxcore) Marcus> UUID : 0e3c432b:c68cda5b:0bf31e79:9dfe252b Marcus> Events : 80471 Marcus> Number Major Minor RaidDevice State Marcus> 0 8 33 0 active sync /dev/sdc1 Marcus> 1 8 17 1 active sync /dev/sdb1 Marcus> 2 8 49 2 active sync /dev/sdd1 Marcus> but the partitions are ok Marcus> lxcore ~ # fdisk -l /dev/sdb1 Marcus> Disk /dev/sdb1: 9.1 TiB, 10000830283264 bytes, 19532871647 sectors Marcus> Units: sectors of 1 * 512 = 512 bytes Marcus> Sector size (logical/physical): 512 bytes / 4096 bytes Marcus> I/O size (minimum/optimal): 4096 bytes / 4096 bytes Marcus> same with sdc1 and sdd1 Marcus> Here is the problem: Marcus> lxcore ~ # mdadm --examine /dev/sdb1 Marcus> /dev/sdb1: Marcus> Magic : a92b4efc Marcus> Version : 1.2 Marcus> Feature Map : 0x1 Marcus> Array UUID : 0e3c432b:c68cda5b:0bf31e79:9dfe252b Marcus> Name : lxcore:0 (local to host lxcore) Marcus> Creation Time : Sat Nov 10 23:04:14 2018 Marcus> Raid Level : raid5 Marcus> Raid Devices : 3 Marcus> Avail Dev Size : 19532609759 (9313.87 GiB 10000.70 GB) Marcus> Array Size : 2352740224 (2243.75 GiB 2409.21 GB) Marcus> Used Dev Size : 2352740224 (1121.87 GiB 1204.60 GB) Marcus> Data Offset : 261888 sectors Marcus> Super Offset : 8 sectors Marcus> Unused Space : before=261800 sectors, after=17179869535 sectors Marcus> State : clean Marcus> Device UUID : a8fbe4dd:a7ac9c16:d1d29abd:e2a0d573 Marcus> Internal Bitmap : 8 sectors from superblock Marcus> Update Time : Tue Jan 12 14:58:40 2021 Marcus> Bad Block Log : 512 entries available at offset 72 sectors Marcus> Checksum : 86f42300 - correct Marcus> Events : 80471 Marcus> Layout : left-symmetric Marcus> Chunk Size : 64K Marcus> Device Role : Active device 1 Marcus> Array State : AAA ('A' == active, '.' == missing, 'R' == replacing) Marcus> same with /dev/sdc1 and /dev/sdd1 Marcus> It shows, that only 1121.68GB are used instead of the Marcus> available 9.1TB, so the array size results in 2.2TB Marcus> Will a simple Marcus> mdadm --grow --size=max /dev/md0 Marcus> fix this and leave the data untouched? Marcus> Any further advice? Marcus> Have a nice day. Marcus> marcus Marcus> please CC me, I'm not subscribed.
