I'm using Ubuntu 12.04 with 2 x 2TB SATA3 harddisks in software RAID1. The filesystem is ext4 with
find . -maxdepth 1 -name '*' -delete to delete a large number of files in a directory, doing
df at intervals show that:
Initially a large number of files get deleted, and
iotop shows the
find operation taking most of the IO.
df shows that the number of files remain constant, and
iotop shows that IO usage is now dominated by
Few minutes later,
df shows the number of files dropping once more.
Can anyone explain this behavior? Is this normal or is there something wrong with my server? Also, how can 3 processes all have 99.99% IO usage at the same time?