When mounted read-only, naturally, reading from an ext4 filesystem does
not cause any write operations. But if I mount it read-write and try to
read from it, then apparently some write operations are issued, because
my "write-mostly" drive in a RAID1 array spins up. Now, I understand
that apparently the mount operation itself does write something, and I
do mount it with a "relatime" option, but I'm just reading stuff over
and over again - it shouldn't be caused by atime updating. Also, a bug
with "write-mostly" finally got fixed, and I'm using a fixed kernel
(latest 3.16 from Debian Jessie-backports).
I just want someone to explain what's happening or direct me towards
some information about that, because I just want to understand. :) And I
don't know any means to find out myself... if there are any, those would
require much better understanding of filesystems than I have...
--
The Ghost
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