From: [EMAIL PROTECTED] on behalf of Mark Seger
Sent: Sat 08/07/2006 12:40
To: [email protected]
Subject: Re: [Sisuite-users] SystemImager and nfs-based image repositories?
>Message: 4
>Date: Sat, 8 Jul 2006 12:28:12
-0400
>From: Daniel Widyono <[EMAIL PROTECTED]>
>Subject:
Re: [Sisuite-users] SystemImager and nfs-based
image
> repositories?
>To:
[email protected]
>Message-ID:
<[EMAIL PROTECTED]>
>Content-Type:
text/plain; charset=us-ascii
>
>
>
>>point,
though you'd need an nfs client. but if you bypass rsync
you'd
>>lose the cability of only installing pieces that
changed.
>>
>>
>
>You wouldn't
need to, since whatever is changed is NFS mounted, so
>automatically seen
by all nodes already. This semi-diskless mode does not
>seem
reasonable, though; I would not use sisuite for diskless
management.
>
>
I'm not talking about diskless
management. The image server I use had
lots of disk space.
However, from a system management perspective, we
have an nfs server that
feeds a number of our systems and gets backed
up, etc. The question is
really based on whether we can use that nfs
server to maintain the
images. The rest of the SI data structures like
/etc/systemimager/
would stay local to the image server.
>For what you are saying, I'm
not sure I understand where the bottleneck is.
>It sounds like your NFS
implementation is not feeding fast enough to handle
>several rsync's
pulling data from the mount point. That would not be
>something
sisuite or any other application could help. You could
upgrade
>and/or tune the NFS connection.
>
The bottleneck seems
to be rsync! For example, do you know how in the
very beginning where
it gets a list of all the files? This takes almost
2 minutes when using
an nfs-mounted /var/lib/systemimager. I believe
the reason is that
rsync has to do zillions of meta-data operations to
check individual file
names, creation dates and sizes. nfs sucks at
doing this type of thing
and so I was hypothesizing that if one took
rsync out of the imaging equation
if things might not perform better.
It's really more of a thought
experiment to better understand what
really happens and possibly to generate
some new insights in how one
might improve the imaging
process.
-mark
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