On 4/11/18 6:39 pm, Berend De Schouwer wrote:
On Sun, 2018-11-04 at 17:32 +1100, Eyal Lebedinsky wrote:
On 4/11/18 4:44 pm, Samuel Sieb wrote:
On 11/3/18 10:19 PM, Eyal Lebedinsky wrote:
What is this io, and can it be stopped? I want to allow the disks
to enter
low power mode (not spin down) when idle.
I'm assuming since it's a new RAID that you haven't created files
on it yet, or at least not many. Try running "lsof +D /mnt/point"
to see if there is any process looking at it. Then try running
"inotifywait -rm /mnt/point" and let it run for a little while to
see if you can catch some process accessing the fs. You will need
to install "inotify-tools" to get that program.
Sure, should have said a bit more: The array was resync'ed, then
(much) data was copied in. This was a few days ago.
Did the sync finish? What is the kernel status of the array?
cat /proc/mdstat
Yes, as I mentioned, the sync finished (28/Oct), then the copy finished (30/Oct).
Acquired a new case and installed the array there (using an old mobo) testing how
the case ventilation performs. Waiting for a new mobo/CPU/mem.
It is during this quiet period that I noticed the io issue which got me wondering.
Since this happens only when the array is mounted, and I do not see any files being
touched, I wondered if this is some ext4 internal housekeeping. Can this be related
to the size of the fs?
Filesystem Size Used Avail Use% Mounted on
/dev/md127 55T 17T 38T 32% /new-raid
$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md127 : active raid6 sdc1[1] sdb1[0] sdf1[4] sdh1[6] sde1[3] sdd1[2] sdg1[5]
58593761280 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/7] [UUUUUUU]
bitmap: 1/88 pages [4KB], 65536KB chunk
unused devices: <none>
--
Eyal at Home (fedora@xxxxxxxxxxxxxx)
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