ZFS hot spares
Ivan Voras
ivoras at freebsd.org
Tue Mar 9 17:15:51 UTC 2010
On 03/08/10 19:06, Steve Polyack wrote:
> ZFS in FreeBSD lacks at least one major feature from the Solaris
> version: hot spares. There is a PR open at
> http://www.freebsd.org/cgi/query-pr.cgi?pr=134491, but there hasn't been
> any motion/thoughts posted on it since its creation almost one year ago.
>
> I'm aware that on Solaris, hot spare replacement is handled by a few
> Solaris-specific daemons, zfs-retire and zfs-diagnose, which both plug
> into the Solaris FMA (Fault Management Architecture). Have there been
> any thoughts on porting these over or getting something similar running
> within FreeBSD? With all of the recent SATA/SAS CAM hotplug work now
> committed, it would be nice to have automatic replacement of hot spares
> with a future hot-replacement of the failed drive.
>
> On the other side, I'd be interested in hearing if anyone has had
> success in rolling their own scripted solution: i.e. something which
> polls 'zpool status' looking for failed drives and performing hot-spare
> replacements automatically.
You don't have to exactly poll it. See /etc/devd.conf:
# Sample ZFS problem reports handling.
notify 10 {
match "system" "ZFS";
match "type" "zpool";
action "logger -p kern.err 'ZFS: failed to load zpool $pool'";
};
notify 10 {
match "system" "ZFS";
match "type" "vdev";
action "logger -p kern.err 'ZFS: vdev failure, zpool=$pool
type=$type'";
};
notify 10 {
match "system" "ZFS";
match "type" "data";
action "logger -p kern.warn 'ZFS: zpool I/O failure,
zpool=$pool error=$zio_err'";
};
notify 10 {
match "system" "ZFS";
match "type" "io";
action "logger -p kern.warn 'ZFS: vdev I/O failure, zpool=$pool
path=$vdev_path offset=$zio_offset size=$zio_size error=$zio_err'";
};
notify 10 {
match "system" "ZFS";
match "type" "checksum";
action "logger -p kern.warn 'ZFS: checksum mismatch,
zpool=$pool path=$vdev_path offset=$zio_offset size=$zio_size'";
};
I don't really know if these notifications actually work since I don't
have hot-plug test machines, but if they do, this looks like a decent
starting point.
More information about the freebsd-fs
mailing list