[Lustre-discuss] e2scan question

[Chad Kerner]

We have been trying to use e2scan to generate a list of files that were 
changed since a specific date.  We are seeing that it has been missing 
some of the modified files and was wondering if anyone else has seen 
this behavior.

I executed:
e2scan -N "Mar 27 08:00:00 2009" /dev/mapper/mdt_scratch > chad.out

[root at abe-mds04 projects_sync]# grep ILRocstar chad.out
./ROOT/.projects/roc/fnajjar/ILRocstar
[root at abe-mds04 projects_sync]#

The following list is a very small subset of files within this directory 
that were changed after the scan date:
[root at abe-bk1 ILRocstar]# pwd
/cfs/scratch/.projects/roc/fnajjar/ILRocstar
[root at abe-bk1 ILRocstar]# ls -lR | grep "Mar 28"
drwxr-x---  4 fnajjar gac    4096 Mar 28 00:56 RSRM105_3D_HG
drwxr-x--- 2 fnajjar gac  4096 Mar 28 00:56 Turb_LES
-rw------- 1 fnajjar gac      4424 Mar 28 01:05 IVHG_j01.o863001
-rw------- 1 fnajjar gac      4412 Mar 28 02:00 IVHG_j02.o863005
-rw------- 1 fnajjar gac      4427 Mar 28 05:53 IVHG_j03.o863017
-rw------- 1 fnajjar gac      5616 Mar 28 06:54 IVHG_j04.o863026
-rw------- 1 fnajjar gac      5084 Mar 28 11:47 IVHG_j05.o863591
-rw------- 1 fnajjar gac      4489 Mar 28 11:58 IVHG_j06.o863592
-rw------- 1 fnajjar gac      4428 Mar 28 20:55 IVHG_j07.o863637

[root at abe-bk1 ILRocstar]# ls -lR | grep "Mar 28" | wc -l
164
[root at abe-bk1 ILRocstar]#


We are wanting to use e2scan to generate a list of files to back up with 
tivoli, because it is much faster to pass tivoli a list than have it 
traverse the entire tree.  However, it looks like e2scan can't be 
trusted to generate a valid list.

The version of e2scan we are running is:
[root at abe-mds04 projects_sync]# rpm -qilf `which e2scan`
Name        : e2fsprogs                    Relocations: (not relocatable)
Version     : 1.40.11.sun1                      Vendor: (none)
Release     : 0redhat                       Build Date: Thu 10 Jul 2008 11:21:23 AM CDT
Install Date: Sat 20 Dec 2008 04:07:31 AM CST      Build Host: lts-build-x86-64-0.co.cfs
Group       : System Environment/Base       Source RPM: e2fsprogs-1.40.11.sun1-0redhat.src.rpm
Size        : 2085263                          License: GPLv2
Signature   : (none)
URL         : ftp://ftp.lustre.org/pub/lustre/other/e2fsprogs/
Summary     : Utilities for managing the second and third extended 
(ext2/ext3) filesystems
Description :


Any thoughts or suggestions would be greately appreciated.

Thanks,
Chad
--
Chad Kerner - ckerner at ncsa.uiuc.edu
Systems Engineer, Storage Enabling Technologies
National Center for Supercomputing Applications
http://www.ncsa.uiuc.edu/~ckerner