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  1. Lustre
  2. LU-13353

quickly determine if a quota is exceeded



    • Type: Improvement
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Labels:
    • Epic/Theme:
    • Rank (Obsolete):


      We run a script that checks the quota status of users and informs them if they are over quota. Currently we run lfs for each user and it can take a long time for a large system with a lot of users.

      So far I've found that I can use llapi_quotactl() (which lfs also uses) to get the necessary information. However, to make llapi_quotactl() run faster, I set dqb_valid to non-zero per the man page for llapi_quotactl(). This seems to work correctly in that I don't cause communication between the QMT and QSDs, but I don't get some of the important information (dqb_curspace and dqb_curinodes) that's used to determine if a user is exceeding a quota (also as expected, per the man page).

      However, I believe the struct lquota_entry.lqe_edquot flag has the information I want. It may not be completely up to date at all times, but that's ok because it's not being used in real time for this script. I can get a hold of it by passing it back to the llapi_quotactl() call in unused space in the struct obd_quotactl which comes out in user space as a struct if_quotactl. I'm just putting all the flags in the struct lquota_entry into the unused flags portion of the struct if_quotactl.

      Is there an easier way to get this information (relatively) quickly?




            hongchao.zhang Hongchao Zhang
            defazio Gian-Carlo Defazio
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