[Bug 1830731] Comment bridged from LTC Bugzilla

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------- Comment From hannsj_uhl at de.ibm.com 2019-10-01 08:40 EDT-------
Comment from  Jan Hoeppner 2019-09-24 07:16:57 CDT

The thin provisioning feature introduces an IOCTL and the discard
support to allow userspace tools and filesystems to release unused and
previously allocated space respectively.

During some internal performance improvements and further tests, the
release of allocated space revealed some issues that may lead to data
corruption in some configurations when filesystems are mounted with
discard support enabled.

As we're working on a fix and trying to clarify the situation, it is highly recommended at this point to _not_ enable discard for any filesystem
when working with ESE DASDs.
mkfs should also be called with discard disabled for ESE DASDs
(e.g. mkfs.ext4 -E nodiscard /dev/dasdX).

Fixes and clarifications will be provided as soon as possible.

Regards,
Jan

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https://bugs.launchpad.net/bugs/1830731

Title:
  [19.10 FEAT] Thin provisioning base support (kernel+390tools)

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in s390-tools package in Ubuntu:
  Fix Released

Bug description:
  Enable use of thin provisioned ECKD volumes.
  Efficient use of storage resources and reduced deployment time for ECKD volumes .

  Tentative Target is kernel 5.3 + s390tools
  Assumption from crystal balls
  merge window closes on Sunday, 2019-07-28 and release on Sunday, 2019-09-15

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