In certain storage setups the Release Allocated Space (RAS) command to
free up space on the storage server previously allocated for an ESE DASD
might not work. At the moment dasdfmt will error out if RAS is failing.
This however is not ideal for the default case when a user is expecting
dasdfmt to simply format the disk.
One workaround would be to specify --no-discard to disable RAS
completely. However, a sane default handling that tries to work every
time is more reasonable.
Change the default handling as follows: If an ESE is detected default to
QUICK mode and try RAS. If RAS fails, fall back to the FULL format mode
and display a warning accordingly.
If -M (--mode) QUICK is specified explicitly dasdfmt will still error
out on a failing RAS. A combination with --no-discard will still allow
for a QUICK format on an ESE DASD in that case, if desired.
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Make dasdfmt aware of thinly provisioned (Extent Space Efficient (ESE))
DASD volumes.
If an ESE volume is recognised a QUICK format is performed, formatting
only the first two tracks. The mode can always be overwritten by --mode.
Previously allocated space is always released before formatting, if not
specified otherwise. The option --no-discard (-D) is provided to omit
the space release.
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is based on the s390-tools-1.39.0 version.
Changes on top of s390-tools-1.39.0:
- Add MIT license to all source files
- Add LICENSE file
- Transform REAMDE to README.md (markdown)
- Add AUTHORS.md file
- Add CONTRIBUTING.md file
- Move changelog from README to CHANGELOG.md file
Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Jan Höppner