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[Frederik Bosch <f.bosch@xxxxxxxxx>]

Very unfortunate but the bug has been triggered again.

[154272.293488] sd 2:0:0:0: [storvsc] Sense Key : Unit Attention [current]
[154272.293508] sd 2:0:0:0: [storvsc] Add. Sense: Changed operating definition
[154272.293665] sd 2:0:0:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automatically adjust these parameters.
[154272.293671] blk_update_request: I/O error, dev sda, sector 201805560
[154272.293718] Aborting journal on device sda1-8.
[154272.314119] EXT4-fs error (device sda1): ext4_journal_check_start:56: Detected aborted journal
[154272.314154] EXT4-fs (sda1): Remounting filesystem read-only

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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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