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RFC 5663, "Parallel NFS (pNFS) Block/Volume Layout", January 2010

Source of RFC: nfsv4 (tsv)

Errata ID: 4142
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT

Reported By: Christoph Hellwig
Date Reported: 2014-10-23
Held for Document Update by: Martin Stiemerling
Date Held: 2016-02-02

Section 2.8 says:

<section does not exist yet>

It should say:

2.8.  Device-ID-to-device-address

   A pNFS block volume layout server MAY signal
   device-ID-to-device-address changes to the client using the
   CB_NOTIFY_DEVICEID callback operation.

   If the change is compatible and does not require outstanding layouts
   to be recalled the server can issue a notification of type
   NOTIFY_DEVICEID4_CHANGE.

   A device-ID-to-device-address mapping change signaled by
   NOTIFY_DEVICEID4_CHANGE must not change the storage system specific
   addressing of the volume, and can only add new storage to the
   existing device.  In particular the following changes are allowed:

     o increasing the size of the underlying block device of a
       PNFS_BLOCK_VOLUME_SIMPLE volume.
     o increasing the size of a PNFS_BLOCK_VOLUME_SLICE volume if the
       underlying block device of the PNFS_BLOCK_VOLUME_SIMPLE volume
       it refers to is big enough to fit the new size.
     o increasing the size of each volume in a bsv_volumes of a
       PNFS_BLOCK_VOLUME_SLICE volume by the same amount.
     o increasing the size of the last volume in bcv_volumes of a
       PNFS_BLOCK_VOLUME_CONCAT volume.
     o adding new members to the end of bcv_volumes of a
       PNFS_BLOCK_VOLUME_CONCAT volume.

Notes:

Specify what device configuration changes can be supported without recalling layouts.

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