elomon

Since I found useful the guide posted but it seems the website is offline now I found a copy in the internet archive at this link: https://web.archive.org/web/20220817112516/https://www.beatificabytes.be/backup-synology-to-unraid/

I will run it now, I cancelled the parity check when I realized that the FS was in RO. If I had to start from scratch there was no point to wait 8 hours for the parity check. Thanks a lot I marked your reply as the resolution since it pointed me in the correct direction.

thanks for posting this command I googled it and I managed to change this flag root@snasbck:~# btrfs property set -ts /mnt/disk1 ro false root@snasbck:~# btrfs prop get /mnt/disk1 ro=false label= root@snasbck:~# touch /mnt/disk1/test.txt root@snasbck:~# After a reboot the btrfs fs is still in RW do toy think this flag has been added automatically due to the power outage? Do you recommend to run a parity check and scrub again? I'll wait for your reply, if no reply i will mark this as resolved this evening

Linux 6.1.49-Unraid. root@snasbck:~# btrfs prop get /mnt/disk1 ro=true label= root@snasbck:~#

Thanks for your reply, here is the output of the mount command: root@snasbck:~# mount rootfs on / type rootfs (rw,size=4018760k,nr_inodes=1004690,inode64) proc on /proc type proc (rw,relatime) sysfs on /sys type sysfs (rw,relatime) tmpfs on /run type tmpfs (rw,nosuid,nodev,noexec,relatime,size=32768k,mode=755,inode64) /dev/sda1 on /boot type vfat (rw,noatime,nodiratime,fmask=0177,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,flush,errors=remount-ro) /boot/bzmodules on /lib type squashfs (ro,relatime,errors=continue) overlay on /lib type overlay (rw,relatime,lowerdir=/lib,upperdir=/var/local/overlay/lib,workdir=/var/local/overlay-work/lib) /boot/bzfirmware on /usr type squashfs (ro,relatime,errors=continue) overlay on /usr type overlay (rw,relatime,lowerdir=/usr,upperdir=/var/local/overlay/usr,workdir=/var/local/overlay-work/usr) devtmpfs on /dev type devtmpfs (rw,relatime,size=8192k,nr_inodes=1004690,mode=755,inode64) devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000) tmpfs on /dev/shm type tmpfs (rw,relatime,inode64) fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) hugetlbfs on /hugetlbfs type hugetlbfs (rw,relatime,pagesize=2M) cgroup_root on /sys/fs/cgroup type tmpfs (rw,relatime,size=8192k,mode=755,inode64) none on /sys/fs/cgroup type cgroup2 (rw,relatime) tmpfs on /var/log type tmpfs (rw,relatime,size=131072k,mode=755,inode64) efivarfs on /sys/firmware/efi/efivars type efivarfs (rw,nosuid,nodev,noexec,relatime) rootfs on /mnt type rootfs (rw,size=4018760k,nr_inodes=1004690,inode64) tmpfs on /mnt/disks type tmpfs (rw,relatime,size=1024k,inode64) tmpfs on /mnt/remotes type tmpfs (rw,relatime,size=1024k,inode64) tmpfs on /mnt/addons type tmpfs (rw,relatime,size=1024k,inode64) tmpfs on /mnt/rootshare type tmpfs (rw,relatime,size=1024k,inode64) nfsd on /proc/fs/nfs type nfsd (rw,relatime) nfsd on /proc/fs/nfsd type nfsd (rw,relatime) /dev/md1p1 on /mnt/disk1 type btrfs (rw,noatime,space_cache=v2,subvolid=5,subvol=/) /dev/md2p1 on /mnt/disk2 type btrfs (rw,noatime,space_cache=v2,subvolid=5,subvol=/) /dev/md3p1 on /mnt/disk3 type btrfs (rw,noatime,space_cache=v2,subvolid=5,subvol=/) /dev/sdb1 on /mnt/cache type btrfs (rw,noatime,ssd,discard=async,space_cache=v2,subvolid=5,subvol=/) shfs on /mnt/user0 type fuse.shfs (rw,nosuid,nodev,noatime,user_id=0,group_id=0,default_permissions,allow_other) shfs on /mnt/user type fuse.shfs (rw,nosuid,nodev,noatime,user_id=0,group_id=0,default_permissions,allow_other) /mnt/cache/system/libvirt/libvirt.img on /etc/libvirt type btrfs (ro,noatime,ssd,space_cache=v2,subvolid=5,subvol=/) root@snasbck:~#

Hi, I need help since after a power outage I have access to my data in read only mode. (tried in safe mode and I have the same issue) I use unraid to backup a synlogy NAS so in case I can start again from scratch but I would like to understand what happened if possible. thanks in advance for your help! Starting and stopping the array I can see these lines in syslog: (same for the 3 disks in the array) Nov 28 21:44:05 snasbck emhttpd: shcmd (5996): mount -t btrfs -o noatime,space_cache=v2 /dev/md1p1 /mnt/disk1 Nov 28 21:44:05 snasbck kernel: BTRFS: device fsid 3ed1a0fc-fef5-4bb5-83e7-bcbb61446162 devid 1 transid 7525 /dev/md1p1 scanned by mount (31992) Nov 28 21:44:05 snasbck kernel: BTRFS info (device md1p1): using crc32c (crc32c-intel) checksum algorithm Nov 28 21:44:05 snasbck kernel: BTRFS info (device md1p1): using free space tree Nov 28 21:44:11 snasbck emhttpd: /mnt/disk1: autotrim setxattr error: Read-only file system Nov 28 21:44:11 snasbck emhttpd: /mnt/disk1: compression setxattr error: Read-only file system Nov 28 21:44:11 snasbck emhttpd: shcmd (5997): btrfs filesystem resize 1:max /mnt/disk1 root@snasbck:~# touch /mnt/disk1/a touch: cannot touch '/mnt/disk1/a': Read-only file system root@snasbck:~# On disks I ran: root@snasbck:~# btrfs dev stats /mnt/disk1 [/dev/md1p1].write_io_errs 0 [/dev/md1p1].read_io_errs 0 [/dev/md1p1].flush_io_errs 0 [/dev/md1p1].corruption_errs 0 [/dev/md1p1].generation_errs 0 root@snasbck:~# btrfs dev stats /mnt/disk2 [/dev/md2p1].write_io_errs 0 [/dev/md2p1].read_io_errs 0 [/dev/md2p1].flush_io_errs 0 [/dev/md2p1].corruption_errs 0 [/dev/md2p1].generation_errs 0 root@snasbck:~# btrfs dev stats /mnt/disk3 [/dev/md3p1].write_io_errs 0 [/dev/md3p1].read_io_errs 0 [/dev/md3p1].flush_io_errs 0 [/dev/md3p1].corruption_errs 0 [/dev/md3p1].generation_errs 0 root@snasbck:~# btrfs dev stats /mnt/cache [/dev/sdb1].write_io_errs 0 [/dev/sdb1].read_io_errs 0 [/dev/sdb1].flush_io_errs 0 [/dev/sdb1].corruption_errs 0 [/dev/sdb1].generation_errs 0 root@snasbck:~# root@snasbck:~# btrfs check /dev/md1p1 Opening filesystem to check... Checking filesystem on /dev/md1p1 UUID: 3ed1a0fc-fef5-4bb5-83e7-bcbb61446162 [1/7] checking root items [2/7] checking extents [3/7] checking free space tree [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) found 5704721584128 bytes used, no error found total csum bytes: 5563904932 total tree bytes: 7282933760 total fs tree bytes: 834879488 total extent tree bytes: 87752704 btree space waste bytes: 891111590 file data blocks allocated: 5697438650368 referenced 5697438650368 root@snasbck:~# btrfs check /dev/md2p1 Opening filesystem to check... Checking filesystem on /dev/md2p1 UUID: db866929-8755-4d41-a352-5589812c00af [1/7] checking root items [2/7] checking extents [3/7] checking free space tree [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) found 3996478119936 bytes used, no error found total csum bytes: 3897380664 total tree bytes: 5560320000 total fs tree bytes: 985268224 total extent tree bytes: 80429056 btree space waste bytes: 744443920 file data blocks allocated: 3990917799936 referenced 3990917799936 root@snasbck:~# btrfs check /dev/md3p1 Opening filesystem to check... Checking filesystem on /dev/md3p1 UUID: 6872e394-796c-46ef-9560-2e9237e98867 [1/7] checking root items [2/7] checking extents [3/7] checking free space tree [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) found 3999059701760 bytes used, no error found total csum bytes: 3900592876 total tree bytes: 4852596736 total fs tree bytes: 394608640 total extent tree bytes: 47316992 btree space waste bytes: 544501468 file data blocks allocated: 3994207105024 referenced 3994207105024 I'm running scrub on all the disks on cache has already finish: root@snasbck:~# btrfs scrub status /mnt/cache/ UUID: c8ec704c-6831-4ad9-9885-2a03c5873442 Scrub started: Tue Nov 28 22:13:20 2023 Status: finished Duration: 0:02:19 Total to scrub: 63.80GiB Rate: 470.03MiB/s Error summary: no errors found root@snasbck:~# On other disk as well: root@snasbck:~# btrfs scrub status /mnt/disk1 UUID: 3ed1a0fc-fef5-4bb5-83e7-bcbb61446162 no stats available Total to scrub: 5.19TiB Rate: 0.00B/s Error summary: no errors found root@snasbck:~# btrfs scrub status /mnt/disk2 UUID: db866929-8755-4d41-a352-5589812c00af no stats available Total to scrub: 3.64TiB Rate: 0.00B/s Error summary: no errors found root@snasbck:~# btrfs scrub status /mnt/disk3 UUID: 6872e394-796c-46ef-9560-2e9237e98867 no stats available Total to scrub: 3.64TiB Rate: 0.00B/s Error summary: no errors found root@snasbck:~# Basic info about my build: Version 6.12.4 2023-08-31 MB: DQ67EP i7-2600 DELL PERC H310 IT mode LSI SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03) 4x SAS SEAGATE ST8000NM0075 1x SATA Micron_M500DC_MT 0134 snasbck-diagnostics-20231128-2228.zip