Huangwei:
Could you post the man page here?
- peter -
huangwei wrote:
Peter Braam wrote:
CFS recently posted a C program that can scan the disks (even while
Lustre is mounted) and generate pathname lists. Our main purpose was
backups. This program should be usable for other purposes.
Huangwei, could you point out how this works?
yes, this program is named e2scan, which is a program using libext2fs
to find inodes with ctime or mtime newer than a given time and print
out their pathname. this program can be found in bug10929, i also
attached it here.
Simple usage example for e2scan:
e2scan -u -f filename dev
this will create a file named modified_pathnames include all modified
file's pathname.
more detail of e2scan can be found in their man page.
- peter -
Felix, Evan J wrote:
The problem becomes that it is very time consuming to run stat on every
file of the MDS. We have used a multi-threaded python program to walk
the entire filesystem fairly effectively on our two large Lustre
systems. I released one of them a while back to the mailing list, and
it should be in the archives somewhere. If you cant locate it send
me a
mail, and I'll send it on to you. The released version was designed to
expire files when they have been on the file system for a long time,
but
it doesn't have to, as it also collects usage data for files, and
directories.
I've heard rumors that someone in CFS is working on and MDS scanning
utility that should be more efficient, but until we see it I have no
idea how well it works..
Evan
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Kaizaad
Bilimorya
Sent: Thursday, January 11, 2007 7:31 AM
To: [email protected]
Subject: [Lustre-discuss] file stat in lustre
Hello,
We would like to build an informational page that will provide
users with stats (size, name, path, mod time,...) on files they
have in the lustre filesystem (and maybe store it in a db). I can
use "lfs" to get strip and OST info but not "stat" info. We could
build some perl tools (probably already out there) which would
traverse the filesystem and give us this information, but I would
like to know if there is a better or efficient way to do this.
Or maybe there is already a lustre utility that can give me the
stat info on a file just by querying the MDS server instead of
traversing the entire lustre filesystem? Or maybe this is not a
good approach? Something better?
thanks
-k
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