[LU-9392] lfs migrate -o and lfs setstripe -o should pick OST from ost_list

• Type: Improvement
• Resolution: Unresolved
• Priority: Minor
• Labels: easy utils
• Environment: lustre-client-2.7.15.3-3.10.0_229.20.1.el6.x86_64.knl2.x86_64
• Assignee: WC Triage
• Reporter: Michael Hebensteit (Inactive)

Description

It would be nice if "lfs setstripe" and "lfs migrate" could pick x out of y given OSTs (y>x). AKA you tell it to stripe across 8 OSTs, give a list of 25 and "lfs migrate" pick the 8 OSTs with most space available. Currently it breaks with x != y.

For files with overstriping, "lfs setstripe -o x,y,z -C N" should repeat the x,y,z pattern until all N OSTs are selected.

Issue Links

• is related to: LU-13363 unbalanced round-robin for object allocation in OST pool
• is related to: LU-11510 preserve PFL/FLR/DoM layout with lfs_migrate
• is related to: LU-14480 Setting specific OST's under pool failed with error message "invalid argument"
• is related to: LU-15494 DNE3: "lfs setdirstripe -D" for specific MDTs
• is related to: LU-8616 DNE3: enhance "lfs mkdir" to select specific MDTs
• is related to: LU-4665 utils: lfs setstripe to specify OSTs
• is related to: LU-9771 FLR1: Landing tickets for File Level Redundancy Phase 1
• is related to: LU-6135 improved support for selecting specific OSTs for files