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  1. Lustre
  2. LU-10360

use Imperative Recovery logs for client->MDT/OST connections

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Details

    • New Feature
    • Resolution: Unresolved
    • Minor
    • None
    • None
    • None
    • 9223372036854775807

    Description

      The Imperative Recovery (IR) feature landed in LU-19 created a dynamic list of active server NIDs on the MGS for purposes of speeding up client recovery when a target failed over to another server node. A server failure triggered a notification from the MGS to the client to update its target NIDs to reconnect to the recovered server more quickly.

      It would be possible to extend this mechanism to also use the MGS IR log to do initial client mount, so that the MGS did not need to store the OST/MDT NIDs statically in the config log, but rather get the current NIDs directly from the dynamic MGS log. This would facilitate Lustre running in configurations where the server NIDs are not static (e.g. cloud, DHCP, etc). The initial connection to the MGS node(s) can already be done using the MGS hostname, since mount.lustre will do DNS name resolution.

      Some care would be needed when OSTs are being registered with the MGS, especially in testing environments where OSTs are reformatted regularly and often use the same fsname, since this may allow OSTs to register with the MGS that do not actually belong to the same filesystem.

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        Issue Links

          is related to

          Bug - A problem which impairs or prevents the functions of the product. LU-14090 lctl replace_nids and starting target with local copy of logs

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-10359 remove NIDs from config llogs

          • 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-11077 Client-specific tunable parameter configuration

          • 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-16086 add generic LNet network number support

          • 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-16722 MGS config log restructuring and redundancy

          • 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-13306 allow clients to accept mgs_nidtbl_entry with IPv6 NIDs

          • Major - Major loss of function.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-13340 add LCFG_ADD_UUIDv6 and related commands

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

          Improvement - An improvement or enhancement to an existing feature or task. LU-14668 LNet: do discovery in the background

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

          Question/Request - A product question or request LU-14608 Adding second network to filesystem

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

          New Feature - A new feature of the product, which has yet to be developed. LU-10391 LNET: Support IPv6

          • Major - Major loss of function.
          • Reopened

          New Feature - A new feature of the product, which has yet to be developed. LU-19 imperative recovery

          • Blocker - Blocks development and/or testing work, production could not run.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. LU-5881 Allow hostnames in NID

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

          Web Link RED-1552 depends on LU-10360

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              wc-triage WC Triage
              adilger Andreas Dilger
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              Dates

                Created:
                Updated: