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  1. Lustre
  2. LU-4865

osd-zfs: increase object block size dynamically as object grows

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    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: Lustre 2.9.0
    • Labels:
    • Rank (Obsolete):
      13423

      Description

      The ZFS VFS code does change blocksize as file grows, e.g. in zfs_write()->zfs_grow_blocksize(). But the osd-zfs just opens the objset and manipulate it directly by the DMU API, shortcutting ZFS VFS layers, so the zfs_grow_blocksize() logic will not work for us.

      Currently the osd-zfs set blocksize to 0 on MDS (then ZFS converts it to the default 512 byte block size), and to 128K on OSS. Neither is optimal setting. We may need to duplicate the ZPL functionality to grow block size dynamically as well.

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          Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. LU-7404 ZFS OSS - Numerous timeouts - SWL

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-8591 allow specifying ZFS blocksize via ladvise

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. LU-7226 improve osd-zfs blocksize heuristics

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          is related to

          Improvement - An improvement or enhancement to an existing feature or task. LU-6152 zfs large block support

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

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              People

              Assignee:
              jay Jinshan Xiong (Inactive)
              Reporter:
              isaac Isaac Huang (Inactive)
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                Dates

                Created:
                Updated:
                Resolved: