Hello Walt,
That's a good news you manage to recover your backup.
ext4 has limitation that might be reached for a backup storage. Personally,
I would way ext4 file system is not a good choice for data storage. As you
found, it has limitation on number of subfolder, it's a journaling
filesystem, doesn't have copy on write, not snapshot, it doesn't have any
checksum either.
--
Patrik Dufresne Service Logiciel inc.
http://www.patrikdufresne.com <http://patrikdufresne.com/>/
514-971-6442
130 rue Doris
St-Colomban, QC J5K 1T9
On Thu, Sep 12, 2019 at 7:53 AM Walt Mankowski <address@hidden> wrote:
Update -- it took about 30 hours to do the regression, started doing
the backup, and then quickly crashed with another "No space left on
device" exception. In kern.log I found these messages:
Sep 11 21:53:47 scruffy kernel: [294433.260536] EXT4-fs warning (device
sde1): ext4_dx_add_entry:2190: Directory (ino: 30017692) index full, reach
max htree level :2
Sep 11 21:53:47 scruffy kernel: [294433.260540] EXT4-fs warning (device
sde1): ext4_dx_add_entry:2194: Large directory feature is not enabled on
this filesystem
It got the error while trying to write a file in
~/.cache/chromium/Default/Cache. Turns out that after running
rdiff-backup for years I'd accumulated over 6 million files in
/backup/scruffy/rdiff-backup-data/increments/home/waltman/.cache/chromium/Default/Cache
It's a bit fuzzy how many files you can add to an ext4 directory, but
it looks like I hit the limit.
I added ~/.cache/chromium to my exclude list and restarted the
backup. It looks a lot happier now.
Walt
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