Den 05.02.2012 22:22, skrev Whit Blauvelt:
Not sure if you're asking your questions precisely enough. The clues may be
in your inclusions, but I'm not going to read all that to figure it out so
I'll ask directly:
Short description of my test
----------------------------
* 4 replicas on single machine
* glusterfs mounted locally
* Create file on glusterfs-mounted directory: date>data.txt
Did you write it through a gluster (or nfs) mount of the gluster file
system, or sneak around behind it with a direct local mount of the
partition?
This was of course done to the glusterfs-type mounted filesystem.
So that the glusterfs-client can save it out on all the bricks.
* Append to file on one of the bricks: hostname>>data.txt
Again, through a gluster/nfs mount, or a local mount?
This was done directly to a brick (local mount) to try to simulate some
disk-problems.
Appending to the file would keep the extended attributes. Gluster should
still handle the file
as its own.
* Trigger a self-heal with: stat data.txt
Again, stat'ing it on a gluster/nfs mount, or a local mount?
The stat was done to the glusterfs-type mount. As I understand it, the
healing is done by the glusterfs-client.
=> Modified file on the brick is still different from the three
other bricks.
Again ... well you know.
Q1: Is the modified file supposed to get corrected in my case?
Q2: Is my test-case invalid for what gluster is supposed to handle?
If you're writing to files through mounts which gluster isn't handling,
you'll get inconsistent stuff. Eventually gluster should catch up. But by
design you should do everything through gluster. (An exception may be if you
want a faster local file read ... anything that writes or touches the file
should be through gluster in any case.)
I know everything has to be done through an glusterfs-mounted filesystem
(lets keep the nfs-mounting away).
But my goal is to simulate something going wrong on a disk.
That is not predicted events done through a glusterfs-mounted filesystem
but rather happens directly to a brick.
I have tested if files are missing on a brick => It is copied from
another replica when healed.
There are however failures that fall in between the 100% working brick
and the one which is 100% disappeared.
These cases interests me.
Best,
Whit
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