FreeBSD rc.script for activating ZFS pool over iSCSI

iscsi-zfs

#!/bin/sh

# PROVIDE: iscsi-zfs
# REQUIRE: iscsid iscsictl mountcritlocal var

. /etc/rc.subr

name="iscsi_zfs"
start_cmd="iscsi_zfs_start"
stop_cmd="iscsi_zfs_stop"
rcvar="iscsi_zfs_enable"

iscsi_zfs_enable=${iscsi_zfs_enable:-"NO"}
iscsi_zfs_wait_iqn=${iscsi_zfs_wait_iqn:-""}
iscsi_zfs_wait_pool=${iscsi_zfs_wait_pool:-""}
iscsi_zfs_wait_retry=${iscsi_zfs_wait_retry:-"30"}

iscsi_zfs_start()
{
    retry=0
    while [ "$retry" -lt "${iscsi_zfs_wait_retry}" ]
    do
        if iscsictl | fgrep "${iscsi_zfs_wait_iqn}" | fgrep "Connected: " >/dev/null; then
            break
        fi
        retry=`expr ${retry} + 1`
        sleep 1
    done
    while [ "$retry" -lt "${iscsi_zfs_wait_retry}" ]
    do
        if zpool status "${iscsi_zfs_wait_pool}" >/dev/null 2>&1; then
            break
        fi
        retry=`expr ${retry} + 1`
        sleep 1
    done
    while [ "$retry" -lt "${iscsi_zfs_wait_retry}" ]
    do
        zfs mount -a
        if mount | fgrep "${iscsi_zfs_wait_pool}" >/dev/null 2>&1; then
            break
        fi
        retry=`expr ${retry} + 1`
        sleep 1
    done
}

load_rc_config $name
run_rc_command "$1"

Yes, this script expects target pools to be imported already (and imported state persists over reboots).

I'm not sure whether imported pools persists over reboot, but adding zpool import "${iscsi_zfs_wait_pool}" in retry-loop may help.

     while [ "$retry" -lt "${iscsi_zfs_wait_retry}" ]
     do
         if zpool status "${iscsi_zfs_wait_pool}" >/dev/null 2>&1; then
             break
         fi
+        zpool import "${iscsi_zfs_wait_pool}"
         retry=`expr ${retry} + 1`
         sleep 1

It can be even more simple. 'zpool import -a' mounts all imported pools.

Thanks!