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Clarify zinject(8) explanation of -e 

Error injection of EIO or ENXIO simply sets the zio's io_error value,
rather than preventing the read or write from occurring.  This is
important information as it affects how the probes must be used.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #7172
This commit is contained in:
Olaf Faaland 2018-02-15 09:50:06 -08:00 committed by Tony Hutter
parent 07ce5d7390
commit 26941ce90b
1 changed files with 3 additions and 0 deletions
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man/man8/zinject.8
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@ -111,6 +111,9 @@ Specify
.BR "dtl" " for an ECHILD error," .BR "dtl" " for an ECHILD error,"
.BR "io" " for an EIO error where reopening the device will succeed, or" .BR "io" " for an EIO error where reopening the device will succeed, or"
.BR "nxio" " for an ENXIO error where reopening the device will fail." .BR "nxio" " for an ENXIO error where reopening the device will fail."
For EIO and ENXIO, the "failed" reads or writes still occur. The probe simply
sets the error value reported by the I/O pipeline so it appears the read or
write failed.
.TP .TP
.BI "\-f" " frequency" .BI "\-f" " frequency"
Only inject errors a fraction of the time. Expressed as a real number Only inject errors a fraction of the time. Expressed as a real number