Hi,
My setup is that I use one file system for / and /home (on SSD) and a
larger raid 10 for /mnt/share (6 x 2TB).
Today I've discovered that 14 of files that are supposed to be over
2GB are in fact just 4096 bytes. I've checked the content of those 4KB
and it seems that it does contain information that were at the
beginnings of the files.
I've experienced this problem in the past (3 - 4 years ago ?) but
attributed it to different problem that I've spoke with you guys here
about (corruption due to non ECC ram). At that time I did deleted
files affected (56) and similar problem was discovered a year but not
more than 2 years ago and I believe I've deleted the files.
I periodically (once a month) run a scrub on my system to eliminate
any errors sneaking in. I believe I did a balance a half a year ago ?
to reclaim space after I deleted a large database.
root@noname_server:/mnt/share# btrfs fi show
Label: none uuid: 060c2345-5d2f-4965-b0a2-47ed2d1a5ba2
Total devices 1 FS bytes used 177.19GiB
devid 3 size 899.22GiB used 360.06GiB path /dev/sde2
Label: none uuid: d4cd1d5f-92c4-4b0f-8d45-1b378eff92a1
Total devices 6 FS bytes used 4.02TiB
devid 1 size 1.82TiB used 1.34TiB path /dev/sdg1
devid 2 size 1.82TiB used 1.34TiB path /dev/sdh1
devid 3 size 1.82TiB used 1.34TiB path /dev/sdi1
devid 4 size 1.82TiB used 1.34TiB path /dev/sdb1
devid 5 size 1.82TiB used 1.34TiB path /dev/sda1
devid 6 size 1.82TiB used 1.34TiB path /dev/sdf1
root@noname_server:/mnt/share# uname -a
Linux noname_server 4.4.0-28-generic #47-Ubuntu SMP Fri Jun 24
10:09:13 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
root@noname_server:/mnt/share# btrfs --version
btrfs-progs v4.4
root@noname_server:/mnt/share#
Problem is that stuff on this filesystem moves so slowly that it's
hard to remember historical events ... it's like AWS glacier. What I
can state with 100% certainty is that:
- files that are affected are 2GB and over (safe to assume 4GB and over)
- files affected were just read (and some not even read) never written
after putting into storage
- In the past I've assumed that files affected are due to size, but I
have quite few ISO files some backups of virtual machines ... no
problems there - seems like problem originates in one folder & size >
2GB & extension .mkv
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