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Added another missed case to arc_summary3

Description

Added another missed case to arc_summary3

It turns out that sometimes, evidently only when run inside the
ZTS handler, arc_summary3 | head > /dev/null will die with ENOTCONN,
and ruin the test run.

Added handling for that.

Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Rich Ercolani <rincebrain@gmail.com>
Closes #12160

Details

Provenance
rincebrain_gmail.comAuthored on Jun 1 2021, 9:20 PM
Brian Behlendorf <behlendorf1@llnl.gov>Committed on Jun 9 2021, 8:05 PM
Parents
rG1fb18c4bdea7: FreeBSD boot code reminder after zpool upgrade
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