[LUDOC-373] Add information about Lustre xattrs

• Type: Improvement
• Resolution: Unresolved
• Priority: Trivial
• Labels: easy
• Assignee: Lustre Manual Triage
• Reporter: Brett Lee (Inactive)

Description

Hello. The current manual does not seem to contain a introduction to the extended attributes. As Andreas provided a list of xattrs, along with information about each, please add this information to the manual. In considering where would be best, my suggestion would be to add a new section, "1.3.2. Lustre Extended Attributes", just after 1.3.1. Lustre File System and Striping. In doing so, a link could quickly be made between the striping policies of 1.3.1, and the trusted.lov xattr associated with retaining the file/directory striping files. At that point, "all" the xattrs could be introduced. Further, indicating in 1.3.2 that chapter 18 - backup and restore (and maybe other chapters later) discusses xattrs, also. Just a suggestion...

Provide by Andreas was:

"trusted.lov" - holds layout for a regular file, or the directory default layout (== lustre.lov)
"trusted.lma" - holds FID for current file, some flags
"trusted.lmv" - holds layout for a striped directory (DNE 2), not present otherwise
"trusted.link" - holds parent directory FID+filename for each link to a file (for lfs fid2path)

Thanks!

Issue Links

• is related to: LU-13031 store JobID of program that created file in inodes at create time

Comments

[Andreas Dilger]

It would be useful to include entries for some of the remaining xattrs:

• user.job holds jobid name that initially created the file (from LU-13031)
• trusted.dmv holds default directory layout inherited by new subdirectories
• filter.fid on OST objects and holds back-pointer to MDT FID that contains object and layout information specific to that object

[Gerrit Updater]

Andreas Dilger ([e-mail]) merged in patch https://review.whamcloud.com/42108/
Subject: LUDOC-373 manual: Add section on Lustre xattrs
Project: doc/manual
Branch: master
Current Patch Set:
Commit: 56db46d9a5fbb4dc2726b5723754a4afe7b5419d

[Gerrit Updater]

Arshad Hussain ([e-mail]) uploaded a new patch: https://review.whamcloud.com/42108
Subject: LUDOC-373 manual: Add section on Lustre xattrs
Project: doc/manual
Branch: master
Current Patch Set: 1
Commit: cd7faface0039579d175d5c4c4687d71db275dab

[Andreas Dilger]

Brett, is there some chance you could take a crack at adding this to the manual yourself? This is described at:

https://wiki.hpdd.intel.com/display/PUB/Making+changes+to+the+Lustre+Manual