Doug,
have you ever tried to put a NFS-volume into the working-path of an
apache-server? I did, and I could messure a significant performance-loss
of the webserver by 1sec per page-load.
The NFS was mounted on a 1GBit dedicated connection between the
webserver and the nfs-server; I tried several TCP-options and
MTU-Settings without any important change on the performance-loss.
Compared to a dedicated mounted ISCSI-Volume this 1sec loss is a lot! I
think NFS is great for changing big amounts of data. But for short
read/write-access NFS does not seem to be the first choice.
Greetings,
Erik
--
My blog: http://blog.elitecoderz.net
Doug Poland wrote:
On Mon, March 1, 2010 12:11, Leinier Cruz Salfran wrote:
On Sun, Feb 28, 2010 at 6:09 AM, Erik Scholtz, ArgonSoft GmbH
<[email protected]> wrote:
I did some research the last two weeks on how to build a cluster
filesystem on FreeBSD.
My solution at the moment is, to rsync all filesystems once a
minute, which is rather to rare. So I tried to get a hook with
KQueue to rsync the filesystems on data-change. Unfortunatly I could
not find a working solution (had a try with IO::KQueue using perl).
i use rsync to make partial data backup .. ie: /etc, /usr/local/etc,
/usr/home, /var/logs ...
How do you guys solve this problem (of a shared filesystem with
rw-option)?
Any hints are welcome, since I'm getting very frustrated at the
moment.
there is a project named 'hast'[1] for a clustered filesystem .. it's
being developed by pawel .. the project has some completed milestones,
so you can get it from fbsd src svn tree .. hast can do clustered
filesystem right now but it's not complete, so there is no stable yet
other way is gmirror[2] + ggated .. with that you can get a raid1 over
net solution .. but i think it's not prepared to be used as
master-master soluction
Neither hast nor gmirror+ggatd are cluster filesystems, in that only
one "side" of the storage is available for writes at a point in time.
Filesystems like OCFS2 and GFS allow multiple, simultaneous read-write
access to block devices.
Given there is not true cluster filesystem available for FreeBSD at
this time, I wonder aloud why so many people are so quick to dismiss
NFS? NFS provides "most" of features of a cluster filesystem today.
If one were to choose NFS for shared storage, one could use tools
available today to make NFS highly available (hast, gmirror+ggated).
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