Two last questions (don't want to bother you):
- Is there any way to prevent undetectable corruptions except using LT
kernel branches?
- Is there any way to prevent false CRC errors for IO-intensive files
except nodatacow?
Thanks!
P.S.
[root@recovery ~]# btrfs version
btrfs-progs v4.9.1
[root@recovery ~]# cat /proc/version
Linux version 3.10.0-1062.9.1.el7.x86_64
(mockbuild@xxxxxxxxxxxxxxxxxxxxxxxx) (gcc version 4.8.5 20150623 (Red
Hat 4.8.5-39) (GCC) ) #1 SMP Fri Dec 6 15:49:49 UTC 2019
[root@recovery ~]# btrfs scrub status -R /mnt/111/
scrub status for 51d26840-8d19-4622-a23f-e78431f11196
scrub started at Mon Jan 6 03:11:30 2020 and finished after 00:07:00
data_extents_scrubbed: 7564571
tree_extents_scrubbed: 225949
data_bytes_scrubbed: 325433925632
tree_bytes_scrubbed: 3701948416
read_errors: 0
csum_errors: 30
verify_errors: 0
no_csum: 25392
csum_discards: 0
super_errors: 0
malloc_errors: 0
uncorrectable_errors: 0
unverified_errors: 0
corrected_errors: 0
last_physical: 438220881920
[root@recovery ~]# btrfs scrub status /mnt/111/
scrub status for 51d26840-8d19-4622-a23f-e78431f11196
scrub started at Mon Jan 6 03:11:30 2020 and finished after 00:07:00
total bytes scrubbed: 306.53GiB with 30 errors
error details: csum=30
corrected errors: 0, uncorrectable errors: 0, unverified errors: 0
пн, 6 янв. 2020 г. в 04:36, Vladimir <amigo.elite@xxxxxxxxx>:
>
> Well, thank you for the response!
>
> To summarize this story:
> Twenty hours passed yet no result from btrfsck, and it slowed down a
> lot more: looks like naive algo (with a hungry log in big O) used for
> this init-magic making it completely unusable in most cases (except if
> it was the only hope to get data back and time doesn't matter) as with
> noticeable slowdown it will take WEEKS to finish for this little
> (~308GB) partition if I understood you correctly and backref ID is
> bytenr.
> It would be much faster for me to get back to the home and restore
> this VM from the backup in comparison with --init-extent-tree.
>
> I was able to mount "broken" FS successfully and recover all the data
> without any issues using CentOS 7 VM 3.10.0-1062.9.1.el7.x86_64 RHEL
> kernel with backports.
> While I was doing all of this stuff with VM, I got OOM, so btrfsck was
> killed by OOM-killer as it's allocated ~25% of my RAM (~4GB). The end.
>
> > It's recommended to let that --init-extent-tree to finish.
> I highly appreciate your attempt to help, but if you would initially
> suggest me to use the previous kernel line instead of wasting weeks (a
> day actually) for testing useless init-extent-tree feature of btrfsck,
> I would appreciate it much higher :)
>
> > IIRC under certain load, btrfs tends to cause false CRC error.
> > It's recommended to disable data cow for VM images.
> Kinda funny. COW is the main reason why I'm using BTRFS...
> Thanks for letting me know; it will allow me to make the right decision.
>
> I'm not whining and love BTRFS so much for its features like
> compression, snapshots, COW copies, checksums, etc, but for me, it's
> the last straw in a heap of problems:
> - Broken checksums making scrub useless
> - Check utility which is missing corruption in a COW-based FS caused
> by OS hang making this FS dangerous for storing any valuable data
> - Unbelievably long fallback mode of btrfsck making it completely useless
> - Order of magnitude higher write amplification than any other FS have
> making any compression useless (well, this isn't related to subject of
> this thread in any way, but it's another issue making one of the great
> FS feature completely useless)
>
> Thank you for all your help and hard work improving BTRFS!
>
> пн, 6 янв. 2020 г. в 02:27, Qu Wenruo <quwenruo.btrfs@xxxxxxx>:
> >
> >
> >
> > On 2020/1/6 上午1:14, Vladimir wrote:
> > > I've updated to the d39ab9f commit of devel branch and restarted
> > > --init-extent-tree.
> > > It looks like it currently keeps restoring extent backrefs:
> > >
> > > Repaired extent references for 11186647040
> > > ref mismatch on [11186655232 8192] extent item 0, found 3
> > > data backref 11186655232 parent 1652575469568 owner 0 offset 0
> > > num_refs 0 not found in extent tree
> > > incorrect local backref count on 11186655232 parent 1652575469568
> > > owner 0 offset 0 found 1 wanted 0 back 0xf6d491c0
> > > data backref 11186655232 root 2368 owner 5682 offset 37952913408
> > > num_refs 0 not found in extent tree
> > > incorrect local backref count on 11186655232 root 2368 owner 5682
> > > offset 37952913408 found 1 wanted 0 back 0x2c4b4770
> > > data backref 11186655232 parent 1581906853888 owner 0 offset 0
> > > num_refs 0 not found in extent tree
> > > incorrect local backref count on 11186655232 parent 1581906853888
> > > owner 0 offset 0 found 1 wanted 0 back 0x10377eb20
> > > backpointer mismatch on [11186655232 8192]
> > > adding new data backref on 11186655232 parent 1652575469568 owner 0
> > > offset 0 found 1
> > > adding new data backref on 11186655232 root 2368 owner 5682 offset
> > > 37952913408 found 1
> > > adding new data backref on 11186655232 parent 1581906853888 owner 0
> > > offset 0 found 1
> > >
> > > How can I detect the latest backref ID? I would like to determine ETA
> > > for the whole process as it tends to slow down as the time goes -
> > > initially it was blazing fast but slows down with backref ID growing
> > > and it only uses the single CPU core.
> >
> > That "Backref ID" is in fact tree block/data bytenr.
> >
> > It's not hat easy to determine an completely accurate one, but you can
> > refer to your chunk tree to get a mapping, and all bytenr shouldn't go
> > beyond that range.
> >
> > >
> > > And one more question: I've attempted to use btrfs restore to get the
> > > most important files from this FS but failed:
> > > offset is 8192
> > > offset is 364544
> > > offset is 45056
> > > offset is 98304
> > > offset is 94208
> > > offset is 61440
> > > We seem to be looping a lot on
> > > /mnt/111/libvirt/images/iphone-apps-w10.hb.img, do you want to keep
> > > going on ? (y/N/a): offset is 4096
> > > offset is 8192
> > > offset is 61440
> > > offset is 24576
> > > offset is 12288
> > > offset is 36864
> > > offset is 20480
> > > offset is 118784
> > > offset is 557056
> > > offset is 20480
> > > offset is 65536
> > > offset is 69632
> > > offset is 94208
> > > offset is 16384
> > > offset is 4096
> > > offset is 139264
> > > offset is 430080
> > > ERROR: cannot map block logical 99312730112 length 1107296256: -2
> > > Error copying data for /mnt/111/libvirt/images/iphone-apps-w10.hb.img
> >
> > That bytenr is doesn't look good, it's too large for a single extent.
> > Not sure how this happened, need extra debug after --init-extent-tree
> > finished.
> >
> > >
> > > I know this file of VM important to me has CRC mismatches detected
> > > during scrub while FS was alive but don't know why as I'm always
> > > getting CRC mismatches for the most IO-active VMs - could it be
> > > related to btrfs restore error?
> >
> > IIRC under certain load, btrfs tends to cause false CRC error.
> >
> > It's recommended to disable data cow for VM images.
> >
> > > And if it is related to the CRC
> > > mismatches, is there any other way to get files with CRC mismatches
> > > from this damaged FS?
> > > I thought about attempting to use 5.3 because you mentioned that my
> > > issue is related to the new extent generation tree-checker introduced
> > > in v5.4 but afraid to interrupt btrfs check process to verify if
> > > downgrade will help me to get files from this FS faster then btrfs
> > > check.
> >
> > It's recommended to let that --init-extent-tree to finish.
> >
> > Thanks,
> > Qu
> >
> > >
> > > Thanks for your help!
> > >
> > > вс, 5 янв. 2020 г. в 05:59, Qu Wenruo <quwenruo.btrfs@xxxxxxx>:
> > >>
> > >>
> > >>
> > >> On 2020/1/5 上午9:30, Vladimir wrote:
> > >>> Dear BTRFS community,
> > >>>
> > >>> I hit a strange issue: btrfsck unable to detect any errors, but I'm
> > >>> also unable to mount this "sane" (by the btrfsck opinion) BTRFS
> > >>> partition.
> > >>>
> > >>> Long story short: at some point, I had to forcefully power off my
> > >>> laptop due to near-OOM hang with very intensive swapping caused by
> > >>> starting the memory-hungry app.
> > >>> This happened on 5.4.0-1.el7.elrepo.x86_64 kernel.
> > >>>
> > >>> After reboot I was unable to mount my data partition (/dev/stripe/data):
> > >>> [29798.631579] BTRFS info (device dm-11): disk space caching is enabled
> > >>> [29798.631581] BTRFS info (device dm-11): has skinny extents
> > >>> [29798.637910] BTRFS info (device dm-11): bdev
> > >>> /dev/mapper/stripe-data--snap2 errs: wr 0, rd 11, flush 0, corrupt
> > >>> 3452, gen 0
> > >>> [29798.677872] BTRFS critical (device dm-11): corrupt leaf:
> > >>> block=1651991592960 slot=16 extent bytenr=93983342592 len=524288
> > >>> invalid generation, have 140287904167864 expect (0, 6389777]
> > >>
> > >> This is the new extent geneartion tree-checker introduced in v5.4.
> > >>
> > >> btrfs-progs doesn't yet support it, but the detect part is already
> > >> submitted to btrfs mail list.
> > >>
> > >> The fs can be completely saved without losing anything.
> > >> You can fetch the this branch:
> > >> https://github.com/kdave/btrfs-progs/tree/devel
> > >>
> > >> Then use --init-extent-tree to fix the problem.
> > >>
> > >> Thanks,
> > >> Qu
> > >>
> > >>> [29798.677875] BTRFS error (device dm-11): block=1651991592960 read
> > >>> time tree block corruption detected
> > >>> [29798.677895] BTRFS error (device dm-11): failed to read block groups: -5
> > >>> [29798.691723] BTRFS error (device dm-11): open_ctree failed
> > >>>
> > >>> I've created an LVM snapshot of the damaged partition and started to dig in:
> > >>>
> > >>> At first, I've updated my kernel to the latest one:
> > >>> # cat /proc/version
> > >>> Linux version 5.4.7-1.el7.elrepo.x86_64 (mockbuild@Build64R7) (gcc
> > >>> version 4.8.5 20150623 (Red Hat 4.8.5-39) (GCC)) #1 SMP Tue Dec 31
> > >>> 11:30:50 EST 2019
> > >>>
> > >>> Second, I've updated btrfs-progs to the latest available version:
> > >>> # btrfs version
> > >>> btrfs-progs v5.4
> > >>>
> > >>> Third, I've attempted to mount this partition again (with no success,
> > >>> even if I'm attempting to use subvolid for the most important
> > >>> subvolume) and then attempted to run btrfsck --repair:
> > >>> # btrfs check -p --repair /dev/stripe/data-snap3
> > >>> enabling repair mode
> > >>> WARNING:
> > >>>
> > >>> Do not use --repair unless you are advised to do so by a developer
> > >>> or an experienced user, and then only after having accepted that no
> > >>> fsck can successfully repair all types of filesystem corruption. Eg.
> > >>> some software or hardware bugs can fatally damage a volume.
> > >>> The operation will start in 10 seconds.
> > >>> Use Ctrl-C to stop it.
> > >>> 10 9 8 7 6 5 4 3 2 1
> > >>> Starting repair.
> > >>> Opening filesystem to check...
> > >>> Checking filesystem on /dev/stripe/data-snap3
> > >>> UUID: 51d26840-8d19-4622-a23f-e78431f11196
> > >>> [1/7] checking root items (0:00:04 elapsed,
> > >>> 3025927 items checked)
> > >>> Fixed 0 roots.
> > >>> No device size related problem found (0:00:36 elapsed,
> > >>> 226080 items checked)
> > >>> [2/7] checking extents (0:00:36 elapsed,
> > >>> 226094 items checked)
> > >>> cache and super generation don't match, space cache will be invalidated
> > >>> [3/7] checking free space cache (0:00:00 elapsed)
> > >>> [4/7] checking fs roots (0:00:55 elapsed,
> > >>> 179338 items checked)
> > >>> [5/7] checking csums (without verifying data) (0:00:01 elapsed,
> > >>> 929754 items checked)
> > >>> [6/7] checking root refs (0:00:00 elapsed, 151
> > >>> items checked)
> > >>> [7/7] checking quota groups skipped (not enabled on this FS)
> > >>> found 329136820224 bytes used, no error found
> > >>> total csum bytes: 317705000
> > >>> total tree bytes: 3702947840
> > >>> total fs tree bytes: 2947874816
> > >>> total extent tree bytes: 342605824
> > >>> btree space waste bytes: 640513083
> > >>> file data blocks allocated: 997170450432
> > >>> referenced 528523653120
> > >>>
> > >>> Currently, I'm waiting for `btrfsck --init-extent-tree` and `btrfs
> > >>> restore` to finish runs on snapshots but not sure if btrfsck is going
> > >>> to help.
> > >>>
> > >>> Some additional info:
> > >>>
> > >>> # btrfs insp dump-tree -b 1651557531648 --follow /dev/stripe/data-snap3
> > >>> btrfs-progs v5.4
> > >>> leaf 1651557531648 items 206 free space 3402 generation 6389777 owner
> > >>> EXTENT_TREE
> > >>> leaf 1651557531648 flags 0x1(WRITTEN) backref revision 1
> > >>> fs uuid 51d26840-8d19-4622-a23f-e78431f11196
> > >>> chunk uuid 0de2db9c-a970-40f0-9fdb-c797b13ac0c1
> > >>> item 0 key (93981401088 EXTENT_ITEM 126976) itemoff 16204 itemsize 79
> > >>> refs 3 gen 3227277 flags DATA
> > >>> extent data backref root 2368 objectid 5682 offset 23367835648 count 1
> > >>> shared data backref parent 1635492167680 count 1
> > >>> shared data backref parent 1601869201408 count 1
> > >>> item 1 key (93981528064 EXTENT_ITEM 12288) itemoff 16167 itemsize 37
> > >>> refs 1 gen 3691918 flags DATA
> > >>> shared data backref parent 1080080089088 count 1
> > >>> item 2 key (93981544448 EXTENT_ITEM 49152) itemoff 16130 itemsize 37
> > >>> refs 1 gen 3684280 flags DATA
> > >>> shared data backref parent 1079417503744 count 1
> > >>> item 3 key (93981593600 EXTENT_ITEM 4096) itemoff 16077 itemsize 53
> > >>> refs 1 gen 5689421 flags DATA
> > >>> extent data backref root 2368 objectid 12305 offset 15963054080 count 1
> > >>> item 4 key (93981597696 EXTENT_ITEM 65536) itemoff 16024 itemsize 53
> > >>> refs 1 gen 6349517 flags DATA
> > >>> extent data backref root 2368 objectid 261 offset 12687536128 count 1
> > >>> item 5 key (93981663232 EXTENT_ITEM 32768) itemoff 15987 itemsize 37
> > >>> refs 1 gen 6349520 flags DATA
> > >>> shared data backref parent 1609922379776 count 1
> > >>> item 6 key (93981696000 EXTENT_ITEM 20480) itemoff 15950 itemsize 37
> > >>> refs 1 gen 6375808 flags DATA
> > >>> shared data backref parent 1079170285568 count 1
> > >>> item 7 key (93981716480 EXTENT_ITEM 24576) itemoff 15913 itemsize 37
> > >>> refs 1 gen 6375808 flags DATA
> > >>> shared data backref parent 1079170285568 count 1
> > >>> item 8 key (93981749248 EXTENT_ITEM 4096) itemoff 15860 itemsize 53
> > >>> refs 1 gen 5224843 flags DATA
> > >>> extent data backref root 2368 objectid 262 offset 9913962496 count 1
> > >>> item 9 key (93981753344 EXTENT_ITEM 4096) itemoff 15807 itemsize 53
> > >>> refs 1 gen 5226775 flags DATA
> > >>> extent data backref root 2368 objectid 261 offset 5763231744 count 1
> > >>> item 10 key (93981757440 EXTENT_ITEM 4096) itemoff 15754 itemsize 53
> > >>> refs 1 gen 5689421 flags DATA
> > >>> extent data backref root 2368 objectid 12305 offset 15963062272 count 1
> > >>> item 11 key (93981761536 EXTENT_ITEM 8192) itemoff 15717 itemsize 37
> > >>> refs 1 gen 3692528 flags DATA
> > >>> shared data backref parent 1081437290496 count 1
> > >>> item 12 key (93981769728 EXTENT_ITEM 524288) itemoff 15680 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 13 key (93981769728 BLOCK_GROUP_ITEM 1073741824) itemoff 15656 itemsize 24
> > >>> block group used 1073639424 chunk_objectid 256 flags DATA
> > >>> item 14 key (93982294016 EXTENT_ITEM 524288) itemoff 15619 itemsize 37
> > >>> refs 1 gen 2108088 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 15 key (93982818304 EXTENT_ITEM 524288) itemoff 15582 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 16 key (93983342592 EXTENT_ITEM 524288) itemoff 15545 itemsize 37
> > >>> refs 1 gen 140287904167864 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 17 key (93983866880 EXTENT_ITEM 524288) itemoff 15508 itemsize 37
> > >>> refs 1 gen 16290361 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 18 key (93984391168 EXTENT_ITEM 524288) itemoff 15471 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 19 key (93984915456 EXTENT_ITEM 524288) itemoff 15434 itemsize 37
> > >>> refs 1 gen 1 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 20 key (93985439744 EXTENT_ITEM 524288) itemoff 15397 itemsize 37
> > >>> refs 1 gen 48 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 21 key (93985964032 EXTENT_ITEM 524288) itemoff 15360 itemsize 37
> > >>> refs 1 gen 2108088 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 22 key (93986488320 EXTENT_ITEM 524288) itemoff 15323 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 23 key (93987012608 EXTENT_ITEM 524288) itemoff 15286 itemsize 37
> > >>> refs 1 gen 140287904167864 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 24 key (93987536896 EXTENT_ITEM 524288) itemoff 15249 itemsize 37
> > >>> refs 1 gen 11882841 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 25 key (93988061184 EXTENT_ITEM 524288) itemoff 15212 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 26 key (93988585472 EXTENT_ITEM 524288) itemoff 15175 itemsize 37
> > >>> refs 1 gen 1 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 27 key (93989109760 EXTENT_ITEM 524288) itemoff 15138 itemsize 37
> > >>> refs 1 gen 48 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 28 key (93989634048 EXTENT_ITEM 524288) itemoff 15101 itemsize 37
> > >>> refs 1 gen 19201 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 29 key (93990158336 EXTENT_ITEM 524288) itemoff 15064 itemsize 37
> > >>> refs 1 gen 12693208 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 30 key (93990682624 EXTENT_ITEM 524288) itemoff 15027 itemsize 37
> > >>> refs 1 gen 75260329984 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 31 key (93991206912 EXTENT_ITEM 524288) itemoff 14990 itemsize 37
> > >>> refs 1 gen 16384 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 32 key (93991731200 EXTENT_ITEM 524288) itemoff 14953 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 33 key (93992255488 EXTENT_ITEM 524288) itemoff 14916 itemsize 37
> > >>> refs 1 gen 10 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 34 key (93992779776 EXTENT_ITEM 524288) itemoff 14879 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 35 key (93993304064 EXTENT_ITEM 524288) itemoff 14842 itemsize 37
> > >>> refs 1 gen 16290360 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 36 key (93993828352 EXTENT_ITEM 524288) itemoff 14805 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 37 key (93994352640 EXTENT_ITEM 524288) itemoff 14768 itemsize 37
> > >>> refs 1 gen 2108088 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 38 key (93994876928 EXTENT_ITEM 524288) itemoff 14731 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 39 key (93995401216 EXTENT_ITEM 524288) itemoff 14694 itemsize 37
> > >>> refs 1 gen 140287904167864 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 40 key (93995925504 EXTENT_ITEM 524288) itemoff 14657 itemsize 37
> > >>> refs 1 gen 11882841 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 41 key (93996449792 EXTENT_ITEM 524288) itemoff 14620 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 42 key (93996974080 EXTENT_ITEM 524288) itemoff 14583 itemsize 37
> > >>> refs 1 gen 1 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 43 key (93997498368 EXTENT_ITEM 524288) itemoff 14546 itemsize 37
> > >>> refs 1 gen 48 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 44 key (93998022656 EXTENT_ITEM 524288) itemoff 14509 itemsize 37
> > >>> refs 1 gen 14337 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 45 key (93998546944 EXTENT_ITEM 524288) itemoff 14472 itemsize 37
> > >>> refs 1 gen 12698072 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 46 key (93999071232 EXTENT_ITEM 524288) itemoff 14435 itemsize 37
> > >>> refs 1 gen 75260641280 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 47 key (93999595520 EXTENT_ITEM 524288) itemoff 14398 itemsize 37
> > >>> refs 1 gen 16384 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 48 key (94000119808 EXTENT_ITEM 524288) itemoff 14361 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 49 key (94000644096 EXTENT_ITEM 524288) itemoff 14324 itemsize 37
> > >>> refs 1 gen 10 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 50 key (94001168384 EXTENT_ITEM 524288) itemoff 14287 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 51 key (94001692672 EXTENT_ITEM 524288) itemoff 14250 itemsize 37
> > >>> refs 1 gen 16290360 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 52 key (94002216960 EXTENT_ITEM 524288) itemoff 14213 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 53 key (94002741248 EXTENT_ITEM 524288) itemoff 14176 itemsize 37
> > >>> refs 1 gen 2108088 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 54 key (94003265536 EXTENT_ITEM 524288) itemoff 14139 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 55 key (94003789824 EXTENT_ITEM 524288) itemoff 14102 itemsize 37
> > >>> refs 1 gen 140287904167864 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 56 key (94004314112 EXTENT_ITEM 524288) itemoff 14065 itemsize 37
> > >>> refs 1 gen 11882841 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 57 key (94004838400 EXTENT_ITEM 524288) itemoff 14028 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 58 key (94005362688 EXTENT_ITEM 524288) itemoff 13991 itemsize 37
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> > >>> refs 1 gen 75208720384 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 193 key (94073335808 EXTENT_ITEM 524288) itemoff 8996 itemsize 37
> > >>> refs 1 gen 16384 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 194 key (94073860096 EXTENT_ITEM 524288) itemoff 8959 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 195 key (94074384384 EXTENT_ITEM 524288) itemoff 8922 itemsize 37
> > >>> refs 1 gen 2108088 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 196 key (94074908672 EXTENT_ITEM 524288) itemoff 8885 itemsize 37
> > >>> refs 1 gen 0 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 197 key (94075432960 EXTENT_ITEM 524288) itemoff 8848 itemsize 37
> > >>> refs 1 gen 140287904167864 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 198 key (94075957248 EXTENT_ITEM 524288) itemoff 8811 itemsize 37
> > >>> refs 1 gen 13722329 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 199 key (94076481536 EXTENT_ITEM 524288) itemoff 8774 itemsize 37
> > >>> refs 1 gen 18446744073709551606 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 200 key (94077005824 EXTENT_ITEM 524288) itemoff 8737 itemsize 37
> > >>> refs 1 gen 1 flags DATA
> > >>> shared data backref parent 1079186604032 count 1
> > >>> item 201 key (94077530112 EXTENT_ITEM 524288) itemoff 8700 itemsize 37
> > >>> refs 1 gen 48 flags DATA
> > >>> shared data backref parent 1079186620416 count 1
> > >>> item 202 key (94078054400 EXTENT_ITEM 524288) itemoff 8663 itemsize 37
> > >>> refs 1 gen 6433 flags DATA
> > >>> shared data backref parent 1079186620416 count 1
> > >>> item 203 key (94078578688 EXTENT_ITEM 524288) itemoff 8626 itemsize 37
> > >>> refs 1 gen 13535032 flags DATA
> > >>> shared data backref parent 1079186620416 count 1
> > >>> item 204 key (94079102976 EXTENT_ITEM 524288) itemoff 8589 itemsize 37
> > >>> refs 1 gen 75207835648 flags DATA
> > >>> shared data backref parent 1079186620416 count 1
> > >>> item 205 key (94079627264 EXTENT_ITEM 364544) itemoff 8552 itemsize 37
> > >>> refs 1 gen 16384 flags DATA
> > >>> shared data backref parent 1079186620416 count 1
> > >>>
> > >>> I'm kindly asking for help to fix this FS.
> > >>> I also would like to know the way to prevent and fix such kind of
> > >>> issues (except to never forcefully power off OS during IO-intensive
> > >>> operations).
> > >>>
> > >>> Thanks everyone!
> > >>>
> > >>
> > >
> > >
> >
>
>
> --
> Kind regards,
> Vladimir.
--
Kind regards,
Vladimir.
