[LU-3828] Default HSM Archive Identifier is not Persistent

• Type: Technical task
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.5.0
• Affects Version/s: Lustre 2.5.0
• Labels: HSM
• Assignee: John Hammond
• Reporter: Malcolm Cowe (Inactive)

Description

The procfs tuneable parameter that is used to define the default HSM archive ID is cannot be set persistently using lctl conf_param or lctl set_param -P. This is by design and is in part because the "hsm" procfs subtree is not created unless and until the HSM feature is itself activated.

The parameter variable is: mdt.<fsname>-MDT*.hsm.archive_id

Please consider a mechanism whereby the system-wide default for the archive ID is stored persistently by the MGS, as it simplifies administration overhead and makes other features such as server failover behave more predictably.

Comments

[Peter Jones]

Landed for 2.5.0

[jacques-charles lafoucriere]

Patch at http://review.whamcloud.com/7557

[jacques-charles lafoucriere]

It is not a "straightforward fix", but the simplest I see. I will work on a patch. Can you validate the other patch, so I will base this new one on the other one (will simplify the review)

[Malcolm Cowe (Inactive)]

I agree that the feature is useful and would like to see it implemented. If making the hsm procfs directory visible is a straightforward fix, then it has my support but someone else has to make the call.