search for: lifetime_write_kbyt

...B : : Note that this number isn't wholly accurate, but rather a guideline. IIRC it is not updated on disk all the time, so may lose writes. You can also get this information from /sys/fs/ext4 including data just for the current mount: # grep . /sys/fs/ext4/*/*_write_kbytes /sys/fs/ext4/dm-0/lifetime_write_kbytes:77632360 /sys/fs/ext4/dm-0/session_write_kbytes:7124948 /sys/fs/ext4/dm-19/lifetime_write_kbytes:28081448 /sys/fs/ext4/dm-19/session_write_kbytes:16520 /sys/fs/ext4/dm-2/lifetime_write_kbytes:60847858 /sys/fs/ext4/dm-2/session_write_kbytes:7739388 /sys/fs/ext4/dm-7/lifetime_write_kbytes:22385952...

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everyone, I been using CF cards for almost more then 7 years now with ext file-system without any major problems on ALIX boards. Last year I took 30 other systems in production with ext4 and the CF cards been dropping out pretty fast, it may have been a bad batch but I do want to look at it. I don't think the devices writes a lot of IO (is

...by mounting the file system now, unmounting it 24 hours from now and then taking the difference. Also the value is only available in granularity of 1 GB (plus minus 512MB) - at least in my case. So, in any case, I wouldn't trust that value for any purposes at all. I did test /sys/fs/ext4/sda/lifetime_write_kbytes now, that seems to be somewhat less bogus, so *that* might actuall be usable for the 24 hours test. But I wasn't talking about that when I said, that this lifetime thing is bogus. Regards, Bodo

...ytes_written + POW2(39)) >> 40); } What we are doing was deliberate, in an effort to display things in a user-friendly fashion that was hopefully still useful. If you'd like to propose something different, please send patches and I'll consider it. > I did test /sys/fs/ext4/sda/lifetime_write_kbytes now, that seems to be > somewhat less bogus, so *that* might actuall be usable for the 24 hours > test. But I wasn't talking about that when I said, that this lifetime > thing is bogus. Bogus is in the eye of the beholder. It's not perfect, and if your system is regularly crash...

On Oct 16, 2014, at 10:25 AM, Bodo Thiesen <bothie@gmx.de> wrote: > * Andreas Dilger <adilger@dilger.ca> hat geschrieben: > >> You can see in the ext4 superblock the amount of data that has been >> written to a filesystem over its lifetime: >> >> Note that this number isn't wholly accurate, but rather a guideline. > > Is is more like a

* Andreas Dilger <adilger@dilger.ca> hat geschrieben: > You can see in the ext4 superblock the amount of data that has been > written to a filesystem over its lifetime: > > Note that this number isn't wholly accurate, but rather a guideline. Is is more like a completely bogus value at best: # LANG=C df -h / | grep root /dev/root 3.7T 3.6T 73G 99% / # grep [0-9]