Date: Sun, 8 Mar 2020 19:34:44 +0100 From: Peter Eriksson <pen@lysator.liu.se> To: freebsd-fs <freebsd-fs@freebsd.org> Subject: Ways to "pause" ZFS resilver? Message-ID: <BDFFC0E8-9D5A-4E45-835F-9D00CDAE8829@lysator.liu.se>
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I=E2=80=99m looking for ideas on how to pause a running ZFS resilver on =
a FreeBSD 11.3-RELEASE-p6 system.
The reason is we have a system where a running such causes severe NFS =
=E2=80=9Chiccups=E2=80=9D for our users (like 5-20s delays more or less =
often) and thus I=E2=80=99d like to figure out some way to =E2=80=9Cpause=E2=
=80=9D it during office hours until either we=E2=80=99ve found and fixed =
the problem or the resilver is done (1D15H to go)...
Since there isn=E2=80=99t any =E2=80=9Czfs=E2=80=9D command to pause a =
running resilver I=E2=80=99m pondering alternative more =E2=80=9Ccreative=E2=
=80=9D ways.
/usr/src/cddl/contrib/opensolaris/uts/common/fs/zfs:
> if (zio_flags & ZIO_FLAG_RESILVER)
> scan_delay =3D zfs_resilver_delay;
> else {
> ASSERT(zio_flags & ZIO_FLAG_SCRUB);
> scan_delay =3D zfs_scrub_delay;
> }
>
> if (scan_delay && (ddi_get_lbolt64() - spa->spa_last_io <=3D =
zfs_scan_idle))
> delay(MAX((int)scan_delay, 0));
Settings vfs.zfs.scan_idle to something high and then =
vfs.zfs.resilver_delay to 10*60*60*kern.hz (10 hours) and hoping the =
=E2=80=9Cif" statement will trigger? But that assumes nothing can/will =
interrupt delay(). Hmmm...
Any other suggestions?
(I don=E2=80=99t want to abort the resilver).
- Peter
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