[Gluster-users] [SPAM?] Re: single storage server
mangoo at wpkg.org
Fri May 6 16:39:47 UTC 2011
On 06.05.2011 18:17, Whit Blauvelt wrote:
> On Fri, May 06, 2011 at 06:06:02PM +0200, Tomasz Chmielewski wrote:
>> Read access should be fine though (with noatime mount), and
>> shouldn't break things?
> Nice question.
> Even if it is safe to only read (seems it should be), does mounting through
> fuse add enough system load to be worth not using? Or is this just about
> saving the moment of labor needed to do the mount?
It's not just "fuse add enough system load" - it's the extra work
I.e. when reading any file, it sends stat() to every gluster server I
think, for that file.
Try doing this experiment, with these assumptions:
/data - directory containing the files physically
/shared - mounted gluster volume
The directories should be big enough (i.e. so that ls -lR /data takes at
least 20 secs).
time ls -lR /data 1>/dev/null
time ls -lR /shared 1>/dev/null
You'll see how much overhead glusterfs is!
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