Dear Andreas, sorry for the delay, I work with Miguel, so i'll write for him.
We have one question, is it possible (safe) to use debugfs on a mounted Lustre filesystem? Thanks Andrea Andreas Dilger wrote: > On 2009-12-16, at 06:28, Miguel Molowny Lopez wrote: > >> we are running lustre 1.8.1.1 on our storage cluster based on IB. >> >> We are building a "bulldozer" for a scratch area and we have found an >> odd behaviour in the e2scan utility (maybe a bug or a ... "defined >> behaviour" we don't know about). >> >> We have reproduced this behavior several time and we are having these >> results: >> - we run e2scan on the MDT to have the files newer than 3 days ago: >> command line used was like: >> * e2scan -l -N '2009-12-13' /dev/mapper/mdt >> or: >> * e2scan -l -n /tmp/file.timestamp /dev/mapper/mdt >> where file.timestamp has been created with the date of >> 3 days ago using touch >> The result is sorted and saved in a file called: 3daysago.list >> - we then run another e2scan looking for files newer than 2 days ago >> using the same command line and the result is sorted and saved in >> a file called: 2daysago.list >> >> The problem is that there are files whose last modification time is >> before the date at which we run the two e2scan commands (they were not >> modified during the run of e2scan) _BUT_ they appear only in the list >> 3daysago.list. Here is an example: >> >> - first run of e2scan at: Dec 15 16:20 (produce list 3daysago.list) >> - second run of e2scan at: Dec 15: 16:50 (produce list 2daysago.list) >> - file: /scratch/foobar.txt has mtime=ctime = Dec 14 03:19 >> >> This file is still on filesystem after the run of the two e2scan cmd >> well, this file appears only in the 3daysago.list. And this happen for >> a _LONG_ list of files. >> > > > This is definitely odd. It is worthwhile to check what the timestamp > is on the MDS, via "debugfs -c -R 'stat foobar.txt'", in addition to > checking via "stat /scratch/foobar.txt" in the filesystem. > > Cheers, Andreas > -- > Andreas Dilger > Sr. Staff Engineer, Lustre Group > Sun Microsystems of Canada, Inc. > > _______________________________________________ > Lustre-discuss mailing list > [email protected] > http://lists.lustre.org/mailman/listinfo/lustre-discuss > -- +------------------------------------------------------- + Andrea Pieretti + C.A.S.P.U.R., + Via dei Tizii, 6b + 00185 Roma ITALY + tel: +39-06-44486712 + mob: +39-328-4280841 + fax: +39-06-4957083 + e-mail: [email protected] + http://www.caspur.it +------------------------------------------------------- + + "Nitwit! Blubber! Oddment! Tweak!" + + Albus Percival Wulfric Brian Dumbledore +------------------------------------------------------- _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
