Synchronise the disklayout<\/p>\n
gpart backup ada0 > \/tmp\/ada0.gpt\r\ngpart restore -F \/dev\/ada1 < \/tmp\/ada0.gpt<\/code><\/pre>\nCheck that everything went as expected.<\/p>\n
gpart show<\/code><\/pre>\nAdd the geom kernel module as loaded on startup<\/p>\n
echo 'geom_mirror_load=\"YES\"' >> \/boot\/loader.conf<\/code><\/pre>\nAdd bootcode to the second disk<\/p>\n
gpart bootcode -b \/boot\/pmbr -p \/boot\/gptboot -i 1 \/dev\/ada1<\/code><\/pre>\nReboot into single-user mode. Then load the geom kernel module<\/p>\n
gmirror load<\/code><\/pre>\nSet up the mirror<\/p>\n
gmirror label -vb round-robin p1 \/dev\/ada0p1\r\ngmirror label -vb round-robin p2 \/dev\/ada0p2\r\ngmirror label -vb round-robin p3 \/dev\/ada0p3<\/code><\/pre>\nAdd the mirrored disk<\/p>\n
gmirror insert p1 \/dev\/ada1p1\r\ngmirror insert p2 \/dev\/ada1p2\r\ngmirror insert p3 \/dev\/ada1p3<\/code><\/pre>\nWait for the disks to synchronise<\/p>\n
gmirror status<\/code><\/pre>\nModify the fstab on the new device<\/p>\n
mount \/dev\/mirror\/p2 \/mnt\r\ncp \/mnt\/etc\/fstab \/mnt\/etc\/fstab.old\r\nee \/mnt\/etc\/fstab<\/code><\/pre>\nReboot into multi-user mode<\/p>\n
To backout from this, using the second disk as main disk do the following with the assumption that first disk is disconnected, thus there’s only one physical disk left now named ada0:<\/p>\n
Boot into single-user mode. Then load the geom kernel module<\/p>\n
gmirror load<\/code><\/pre>\nDeactivate the now degraded mirror<\/p>\n
gmirror deactivate p1 \/dev\/ada0p1\r\ngmirror deactivate p2 \/dev\/ada0p2\r\ngmirror deactivate p3 \/dev\/ada0p3<\/code><\/pre>\nClear metadata from the disks<\/p>\n
gmirror clear \/dev\/ada0p1\r\ngmirror clear \/dev\/ada0p2\r\ngmirror clear \/dev\/ada0p3<\/code><\/pre>\nfsck the the disk in order to be able to mount it<\/p>\n
fsck \/dev\/ada0<\/code><\/pre>\nEdit the fstab. ee can be run without having to mount \/usr<\/p>\n
mount \/dev\/ada0p2 \/mnt\r\ncp \/mnt\/etc\/fstab \/mnt\/etc\/fstab.mirrored\r\nee \/mnt\/etc\/fstab<\/code><\/pre>\nReboot into multi-user mode<\/p>\n","protected":false},"excerpt":{"rendered":"
Synchronise the disklayout gpart backup ada0 > \/tmp\/ada0.gpt gpart restore -F \/dev\/ada1 < \/tmp\/ada0.gpt Check that everything went as expected. gpart show Add the geom kernel module as loaded on startup echo ‘geom_mirror_load=”YES”‘ >> \/boot\/loader.conf Add bootcode to the second disk gpart bootcode -b \/boot\/pmbr -p \/boot\/gptboot -i 1 \/dev\/ada1 Reboot into single-user mode. Then …<\/span> Read More →<\/span><\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[31,19,7,8],"_links":{"self":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts\/35"}],"collection":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/comments?post=35"}],"version-history":[{"count":3,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts\/35\/revisions"}],"predecessor-version":[{"id":102,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/posts\/35\/revisions\/102"}],"wp:attachment":[{"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/media?parent=35"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/categories?post=35"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.strahlert.net\/wordpress\/wp-json\/wp\/v2\/tags?post=35"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}