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  1. Lustre
  2. LU-16921

CSDC: ensure that DoM and CSDC work together

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    • Task
    • Resolution: Done
    • Minor
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    • 3
    • 9223372036854775807

    Description

      As part of the CSDC testing, we should ensure that both CSDC and DoM work together properly

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          is related to

          New Feature - A new feature of the product, which has yet to be developed. LU-5603 Enable inline_data feature for Lustre

          • Major - Major loss of function.
          • Open

          Activity

            [LU-16921] CSDC: ensure that DoM and CSDC work together
            sarah Sarah Liu added a comment -

            EX-7806 has not landed yet, close the ticket and verify when it lands

            sarah Sarah Liu added a comment - EX-7806 has not landed yet, close the ticket and verify when it lands
            adilger Andreas Dilger added a comment - - edited

            With compressed data being written by the client, it potentially becomes possible to pack a considerable amount of data directly into the MDT inode with DoM together with the ext4 inline_data feature.

            Currently, the inline_data feature might allow ~512 bytes of data to be stored directly in the 1024-byte MDT inode (after layout and other xattrs are added), but with compression this might be 1-2KiB depending on the file contents.

            Note however, that there is some development work needed for inline_data to work together with the dir_data feature.

            adilger Andreas Dilger added a comment - - edited With compressed data being written by the client, it potentially becomes possible to pack a considerable amount of data directly into the MDT inode with DoM together with the ext4 inline_data feature. Currently, the inline_data feature might allow ~512 bytes of data to be stored directly in the 1024-byte MDT inode (after layout and other xattrs are added), but with compression this might be 1-2KiB depending on the file contents. Note however, that there is some development work needed for inline_data to work together with the dir_data feature.

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              sarah Sarah Liu
              cfaber Colin Faber
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