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  1. Lustre
  2. LU-16

Allow objects larger than 2TB in size

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: Lustre 2.1.0
    • Labels:
      None
    • Bugzilla ID:
      20,128
    • Rank (Obsolete):
      4824

      Description

      quote Andreas in bug 20128:

      Current ext3 code limits the size of individual objects to 2TB. This assumption
      has been hard-coded into the client by use of LUSTRE_STRIPE_MAXBYTES in
      lov_alloc_memmd(). For ext4- and DMU-based OSTs this assumption is incorrect.

      We need to be able to convey the maximum object size from the OST to the client
      via obd_connect_data. This can be extracted from the OST superblock
      sb->s_maxbytes and sent to clients that send a new OBD_CONNECT_MAXBYTES flag to
      fill in an ocd_maxbytes field at connect time. The minimum of the per-OSC
      maxbytes values should be used to determine the lov_maxbytes and lli_maxbytes.

      Make sure not to conflict with any fields/flags in the obd_connect_data or
      OBD_CONNECT between branches...

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              • Assignee:
                bobijam Zhenyu Xu
                Reporter:
                bobijam Zhenyu Xu
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                Dates

                • Created:
                  Updated:
                  Resolved: