1 .TH llsom_sync 8 "2018 Jan 10" Lustre "Lustre Filesystem utility"
3 llsom_sync \- Utility to sync file LSOM xattr.
6 .B llsom_sync --mdt|-m <mdt> --user|-u <user id>
8 .B\t\t\t [--daemonize|-d] [--verbose|-v] [--interval|-i]
10 .B\t\t\t [--min-age|-a] [--max-cache|-c] [--sync|-s] <lustre_mount_point>
15 is designed to sync file LSOM xattr in the Lustre Filesystem by
16 using Lustre MDT changelogs. A changelog user must be registered
17 (see lctl (8) changelog_register) before using this tool.
23 The metadata device which need to be synced the LSOM xattr of files.
24 A changelog user must be registered for this device.
28 The changelog user id for the above MDT device. See lctl(8) changelog_register.
32 Daemonize the program. In daemon mode, the utility will scan, process the
33 changelog records and sync the LSOM xattr for files periodically.
37 Produce a verbose output.
41 The time interval to scan the Lustre changelog and process the log record in
46 The time that llsom_sync tool will not try to sync the SOM data for any files
47 closed less than this many seconds old. The default min-age value is 600s
52 The total memory used for the FID cache which can be with a suffix [KkGgMm].
53 The default max-cache value is 256MB. For the parameter value < 100, it is
54 taken as the percentage of total memory size used for the FID cache instead
59 Sync file data to make the dirty data out of cache to ensure the blocks count
60 is correct when update the file LSOM xattr. This option could hurt server
61 performance significantly if thousands of fsync requests are sent.
66 Register a changelog consumer for MDT lustre-MDT0000
67 $ cl_user=$(ssh root@mds01 lctl --device lustre-MDT0000 changelog_register -n)
74 After perform some file operations on the Lustre Filesystem with
75 mount point '/mnt/lustre' and the filesystem undergoes some changes,
77 $ llsom_sync --mdt=lustre-MDT0000 --user=$cl_user \\
82 To deregister the changelog user (e.g. after this example, or if SOM
83 updates are no longer needed):
85 $ ssh root@mds01 lctl --device lustre-MDT0000 changelog_deregister $cl_user
88 The llsom_sync command is part of the Lustre filesystem.