In testing out various ways to achieve disk compression on our PostgreSQL servers, I ended up with a server build with a version of ZFS newer that the package distribution. Which means I needed to recreate the pool to use an older version of ZFS that would be updated as part of the routine patching. Beyond backing up and restoring the data … <\/p>\n\n\n\n
zpool export pgpool
zpool destroy pgpool
zpool list # this still shows a pool on sdb<\/p>\n\n\n\n
zpool labelclear \/dev\/sdb<\/p>\n\n\n\n
dd if=\/dev\/zero of=\/dev\/sdb bs=1M count=10
wipefs -a \/dev\/sdb<\/p>\n\n\n\n
cd \/root\/zfs
make uninstall<\/p>\n\n\n\n
yum install https:\/\/dl.fedoraproject.org\/pub\/epel\/epel-release-latest-8.noarch.rpm
yum install kernel-devel<\/p>\n\n\n\n
yum install https:\/\/zfsonlinux.org\/epel\/zfs-release-2-3$(rpm –eval “%{dist}”).noarch.rpm
dnf config-manager –disable zfs
dnf config-manager –enable zfs-kmod
yum install zfs<\/p>\n\n\n\n
\/usr\/src\/kernels\/$(uname -r)\/scripts\/sign-file sha256 \/root\/signing\/MOK.priv \/root\/signing\/MOK.der \/lib\/modules\/$(uname -r)\/extras\/zfs\/avl\/zavl.ko
…
\/usr\/src\/kernels\/$(uname -r)\/scripts\/sign-file sha256 \/root\/signing\/MOK.priv \/root\/signing\/MOK.der \/lib\/modules\/$(uname -r)\/extras\/zfs\/zfs\/zfs.ko<\/p>\n\n\n\n
init 6<\/p>\n\n\n\n
zpool create pgpool sdb
zfs create pgpool\/pgdata
zfs set compression=lz4 pgpool\/pgdata
df -h \/pgpool\/pgdata\/
<\/p>\n","protected":false},"excerpt":{"rendered":"
In testing out various ways to achieve disk compression on our PostgreSQL servers, I ended up with a server build with a version of ZFS newer that the package distribution. Which means I needed to recreate the pool to use an older version of ZFS that would be updated as part of the routine patching. …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[30],"tags":[2019,1944],"class_list":["post-11161","post","type-post","status-publish","format-standard","hentry","category-system-administration","tag-openzfs","tag-zfs"],"_links":{"self":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts\/11161","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11161"}],"version-history":[{"count":1,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts\/11161\/revisions"}],"predecessor-version":[{"id":11162,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=\/wp\/v2\/posts\/11161\/revisions\/11162"}],"wp:attachment":[{"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rushworth.us\/lisa\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}