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[Brian Vargyas <brianv@xxxxxxxxxxx>]

1st Night Backups Ran okay, with no strange SCSI errors.  The following
was logged into syslog:

May 28 00:01:22 test Hyper-V VSS: VSS: op=FREEZE: succeeded
May 28 00:01:21 test kernel: [22188.912452] sd 0:0:0:0: [storvsc] Sense Key : Unit Attention [current]
May 28 00:01:21 test kernel: [22188.912465] sd 0:0:0:0: [storvsc] Add. Sense: Changed operating definition
May 28 00:01:21 test kernel: [22188.912596] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
May 28 00:01:21 test Hyper-V VSS: VSS: op=THAW: succeeded
May 28 00:17:01 test CRON[1323]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
May 28 01:17:01 test CRON[1329]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
May 28 01:36:17 test kernel: [27884.812212] sd 0:0:0:0: [storvsc] Sense Key : Unit Attention [current]
May 28 01:36:17 test kernel: [27884.812229] sd 0:0:0:0: [storvsc] Add. Sense: Changed operating definition
May 28 01:36:17 test kernel: [27884.812361] sd 0:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.

So we're still getting the messages about, hey, something changed on the
Disk, but I can live with that for the price of a proper VSS snapshot.

Again, this is with the 3.19 -39 kernel on 14.04.2 LTS.   I'll keep an
eye on it.   I guess I'll wait for production changes, but it's so
tempting :-)

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https://bugs.launchpad.net/bugs/1445195

Title:
  [Hyper-V] Kernel patches for storvsc

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Precise:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged
Status in linux source package in Vivid:
  Triaged
Status in linux source package in Wily:
  Triaged

Bug description:
  Storage driver performance updates for vivid

  K. Y. Srinivasan (7):
    scsi: storvsc: Increase the ring buffer size
    scsi: storvsc: Size the queue depth based on the ringbuffer size
    scsi: storvsc: Always send on the selected outgoing channel
    scsi: storvsc: Retrieve information about the capability of the target
    scsi: storvsc: Fix a bug in copy_from_bounce_buffer()
    scsi: storvsc: Don't assume that the scatterlist is not chained
    scsi: storvsc: Set the tablesize based on the information given by the host

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