Yesterday I went through the process of creating a ZFS storage pool with a single device :-<\/p>\n
zpool create zt1 cXXXXX<\/pre>\nNext adding an additional device to mirror the first :-<\/p>\n
zpool attach zt1 cXXXXX cYYYYY<\/pre>\nWatched it resilver, and then detached the first replica reducing the number of replicas to one :-<\/p>\n
zpool detach zt1 cXXXXX<\/pre>\nThis is one of the nicest ways possible to migrate a large dataset from one set of devices to another (say replacing a SAN). However the documentation on Sun’s manual page for zpool<\/em> is just a little vague in the relevant area and does not explicitly say that a single replica is a perfectly valid configuration.<\/p>\n
This might all seem a little obvious, but removing a replica to reduce a storage pool to an pool without a mirror (no redundancy) is something that some volume managers don’t allow.<\/p>\n","protected":false},"excerpt":{"rendered":"
Yesterday I went through the process of creating a ZFS storage pool with a single device :- zpool create zt1 cXXXXX Next adding an additional device to mirror the first :- zpool attach zt1 cXXXXX cYYYYY Watched it resilver, and then detached the first replica reducing the number of replicas to one :- zpool detach […]<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_share_on_mastodon":"0"},"categories":[4],"tags":[133,33,88],"class_list":["post-565","post","type-post","status-publish","format-standard","hentry","category-it","tag-mirrors","tag-solaris","tag-zfs","category-4-id","post-seq-1","post-parity-odd","meta-position-corners","fix"],"share_on_mastodon":{"url":"","error":""},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p1f2KI-97","_links":{"self":[{"href":"https:\/\/really.zonky.org\/index.php?rest_route=\/wp\/v2\/posts\/565","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/really.zonky.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/really.zonky.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/really.zonky.org\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/really.zonky.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=565"}],"version-history":[{"count":4,"href":"https:\/\/really.zonky.org\/index.php?rest_route=\/wp\/v2\/posts\/565\/revisions"}],"predecessor-version":[{"id":807,"href":"https:\/\/really.zonky.org\/index.php?rest_route=\/wp\/v2\/posts\/565\/revisions\/807"}],"wp:attachment":[{"href":"https:\/\/really.zonky.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=565"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/really.zonky.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=565"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/really.zonky.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}