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Man zpool-scrub.8: describe sequential scrub

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Describe sequential scrub and add examples of scrub status.

Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: George Melikov <mail@gmelikov.ru>
Closes #12429
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man/man8/zpool-scrub.8
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@ -22,11 +22,11 @@
.\" Copyright (c) 2012, 2018 by Delphix. All rights reserved.
.\" Copyright (c) 2012 Cyril Plisko. All Rights Reserved.
.\" Copyright (c) 2017 Datto Inc.
.\" Copyright (c) 2018 George Melikov. All Rights Reserved.
.\" Copyright (c) 2018, 2021 George Melikov. All Rights Reserved.
.\" Copyright 2017 Nexenta Systems, Inc.
.\" Copyright (c) 2017 Open-E, Inc. All Rights Reserved.
.\"
.Dd May 27, 2021
.Dd July 25, 2021
.Dt ZPOOL-SCRUB 8
.Os
.
@ -64,6 +64,11 @@ faults or disk failure.
.Pp
Because scrubbing and resilvering are I/O-intensive operations, ZFS only allows
one at a time.
.Pp
A scrub is split into two parts: metadata scanning and block scrubbing.
The metadata scanning sorts blocks into large sequential ranges which can then
be read much more efficiently from disk when issuing the scrub I/O.
.Pp
If a scrub is paused, the
.Nm zpool Cm scrub
resumes it.
@ -91,6 +96,26 @@ again.
.It Fl w
Wait until scrub has completed before returning.
.El
.Sh EXAMPLES
.Bl -tag -width "Exam"
.It Sy Example 1 : Status of pool with ongoing scrub:
Output:
.Bd -literal -compact -offset Ds
.No # Nm zpool Cm status
...
scan: scrub in progress since Sun Jul 25 16:07:49 2021
403M scanned at 100M/s, 68.4M issued at 10.0M/s, 405M total
0B repaired, 16.91% done, 00:00:04 to go
...
.Ed
Where:
.Bl -dash -offset indent
.It
Metadata which references 403M of file data has been
scanned at 100M/s, and 68.4M of that file data has been
scrubbed sequentially at 10.0M/s.
.El
.El
.
.Sh SEE ALSO
.Xr zpool-iostat 8 ,