* Andreas Dilger <adilger@xxxxxxxxx> hat geschrieben: > The "lifetime writes" value has not been around forever, so if the > filesystem was originally created and populated on an older kernel > (e.g. using ext3) it would not contain a record of those writes. It was created as stable ext4 in the first place. So only if there was a stable ext4 release which didn't update the "lifetime writes" value this could be the case. > There is also some potential loss if the filesystem isn't unmounted > cleanly. Yea, that *might* be it - but that only supports my statement, that this value is mainly bogus. > It definitely _can_ be used to monitor the writes to a particular > filesystem over the past 24h, which is what the original poster was > asking about. Since it never get's updated unless the file system is unmounted, it can only be used for a 24 hours test 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 _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
