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zpool import progress indicator #8646

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wants to merge 2 commits into from
Closed

zpool import progress indicator #8646

wants to merge 2 commits into from

Commits on Oct 24, 2021

  1. Add kstat_read() for linux and freebsd 

    On linux, kstats are fetched with open(),read(),close() or similar.
On freebsd, they are fetched with sysctl.

Create compat functions that do the right thing for the platform.
Currently handles only kstats which are directly below "zfs".

Signed-off-by: Olaf Faaland <[email protected]>
    @ofaaland
    ofaaland committed Oct 24, 2021
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  2. zpool import progress reports for long imports 

    When an import requires a long MMP activity check, or when the user
requests pool recovery, the import make take a long time.  The user may
not know why, or be able to tell whether the import is progressing or is
hung.

Add a new option to "zpool import", "-v" (for verbose).

When the -v option is used, create an additional thread which
periodically checks the contents of kstat/zfs/import_progress.  If the
import does not finish quickly, it reports the following on stdout:
* Name and guid of pool being imported
* User-friendly version of spa_load_state
* Expected time import will complete
* the max txg if recovering the pool

If one or more of these values change, the thread prints a new record.

A new record will be printed to stdout with a maximum frequency of one
per second so as not to spam the user.  As a result the printed output
may reflect only some of the import states transitioned through.

Use import kstat to check for Multihost activity check in relevant
tests, instead of using import duration, which works poorly when testing
on a slow machine.

Sample output:

	Pool tank1 (guid 4591991398949870326):
	Checking for a remote import.
	Check will complete by Tue Apr 16 08:43:58 2019

	Pool tank1 (guid 4591991398949870326):
	Checking for a remote import.
	Check will complete by Tue Apr 16 08:44:43 2019
	Recovering Pool max txg 745

Signed-off-by: Olaf Faaland <[email protected]>
    @ofaaland
    ofaaland committed Oct 24, 2021
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