[LU-10808] DoM: component end should align with dom_stripesize

• Type: Technical task
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Affects Version/s: Lustre 2.11.0
• Labels: DoM2
• Assignee: Mikhail Pershin
• Reporter: Andreas Dilger

Description

If the DoM component extent_end is set larger than the MDT dom_stripesize (via lfs setstripe -Eextent_end -L mdt ) then this currently generates an error.  Since users do not have any easy way to determine the dom_stripesize on the MDT, and it may in fact be different on a per-MDT basis (e.g. if MDT0000 sets dom_stripesize=0 because it was formatted before DoM, or it is adjusted automatically by the MDS when the MDT is nearly full).  This complicates DoM usage for users (imagine a striped directory that has different DoM size limits for the MDTs it is striped over).

The MDS should automatically adjust the component extent_end to match the MDT dom_stripesize, and if dom_stripesize=0 then the DoM component should be removed.

Issue Links

• is related to: LU-10786 sanity-flr test_45: Create /mnt/lustre/d45.sanity-flr/f45.sanity-flr failed
• is related to: LU-10917 If setstripe for DoM file fails, less/no information is given
• is related to: LU-11608 DoM2: inherited DoM component size is not limited
• is related to: LU-10070 PFL self-extending file layout
• is related to: LU-10465 increase default stripe size to 4MB