[LU-3315] O_NOATIME: don't change access time after backup

• Type: Improvement
• Resolution: Fixed
• Priority: Major
• Affects Version/s: Lustre 1.8.7, Lustre 2.5.0
• Environment: redhat 5.7
• Assignee: Bruno Faccini (Inactive)
• Reporter: Supporto Lustre Jnet2000 (Inactive)

Description

hi,

i use bacula like software of backup,when i run job and start the backup, the job modifies the access time of the files.
In bacula there is the optin noatime that don't change the access time.

"
noatime=yesno
If enabled, and if your Operating System supports the O_NOATIME file open flag, Bacula will open all files to be backed up with this option. It makes it possible to read a file without updating the inode atime (and also without the inode ctime update which happens if you try to set the atime back to its previous value). It also prevents a race condition when two programs are reading the same file, but only one does not want to change the atime. It's most useful for backup programs and file integrity checkers (and bacula can fit on both categories).

This option is particularly useful for sites where users are sensitive to their MailBox file access time. It replaces both the keepatime option without the inconveniences of that option (see below).

If your Operating System does not support this option, it will be silently ignored by Bacula. "

But this function works with filesystem ext3 but not works in lustre filesystem.

Could you make something ?

Best regards

Augusto Casciola

Issue Links

• is duplicated by: LU-3831 ll_readdir() ignores O_NOATIME