[LU-14413] interop: sanity test 27M fails with '(1) stripe count 1, should be 4'

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.12.8, Lustre 2.15.0
• Affects Version/s: Lustre 2.14.0
• Labels: interop
• Severity: 3
• Assignee: James A Simmons
• Reporter: James Nunez (Inactive)

Description

sanity test_27M fails for interop testing between 2.12.x, for x >= 4, clients and Lustre servers with version >= 2.13.51.81.

Looking at the suite_log for a recent failure at https://testing.whamcloud.com/test_sets/6027d1c8-86b2-4ebc-97a4-6f10f337bdbf, we can see that the test fails because lfs doesn’t recognize the ‘-C’ flag

== sanity test 27M: test O_APPEND striping =========================================================== 00:04:37 (1612829077)
CMD: trevis-203vm4 /usr/sbin/lctl get_param -n version 2>/dev/null ||
				/usr/sbin/lctl lustre_build_version 2>/dev/null ||
				/usr/sbin/lctl --version 2>/dev/null | cut -d' ' -f2
lfs setstripe setstripe: unrecognized option '-C'
To create a file with specified striping/composite layout, or
create/replace the default layout on an existing directory:
usage: setstripe [--component-end|-E <comp_end>]
                 [--stripe-count|-c <stripe_count>]
                 [--stripe-index|-i <start_ost_idx>]
                 [--stripe-size|-S <stripe_size>]
                 [--layout|-L <pattern>]
                 [--pool|-p <pool_name>]
                 [--ost|-o <ost_indices>]
                 [--yaml|-y <yaml_template_file>]
                 [--copy=<lustre_src>]
                 <directory|filename>
 or
…

The overstriping feature was landed to b2_13 with patch https://review.whamcloud.com/#/c/28425/ which added the ‘-C’ flag to lfs. We did not backport the overstriping feature to b2_12.

We backported the patch “LU-9341: Add special O_APPEND striping” https://review.whamcloud.com/#/c/37007/ to b2_12 that adds sanity test 27M that uses ‘lfs -C’ .

As suggested by Andreas D., the test should work with using ‘lfs -c 4’, or max OSTs if there aren’t four OSTs configured, instead of ‘lfs -C 4’ . As an additional improvement, we should use "save_layout_restore_at_exit $MOUNT" to restore the root directory layout instead of "save_layout_restore_at_exit $MOUNT" .