[LU-10114] Feasibility of increasing upper limit of maximum HSM backends registered with MDT

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.0
• Labels: HSM
• Assignee: Teddy
• Reporter: Matt Rásó-Barnett (Inactive)

Description

Hello,
As mentioned in Xue Wei's LAD'17 talk: https://www.eofs.eu/_media/events/lad17/08_li_xi_lcoc_lad_2017.pdf (LCOC: Lustre Cache on Client based on SSD – Xue Wei, NSCC-Wuxi and Li Xi, DDN), there is currently an upper limit of 32 HSM archives that can be registered.

We also have a potential use-case for HSM that would greatly benefit from being able to increase this threshold, for example we would then be able to allocate a HSM archive for an individual customer's project, thus being able to colocate their HSM archived files more logically on our particular HSM backend (a tape filesystem), which would greatly improve our ability to restore large numbers of files.

My question is just is this upper limit something that is relatively simple to increase without impacting much else?

I've emailed Li Xi from DDN who was also listed in the talk (I haven't managed to find the email address of Xue Wei from NSCC-Wuxi) if he or Xue could comment on this too, so I'll update this if I hear back from them.

Thanks,
Matt

Issue Links

• is related to: LU-10092 PCC: Lustre Persistent Client Cache