{"id":311,"date":"2021-12-21T11:26:43","date_gmt":"2021-12-21T08:26:43","guid":{"rendered":"https:\/\/fewit.ru\/?p=311"},"modified":"2022-03-26T19:34:27","modified_gmt":"2022-03-26T16:34:27","slug":"lvm-cache","status":"publish","type":"post","link":"https:\/\/fewit.ru\/?p=311","title":{"rendered":"LVM Cache"},"content":{"rendered":"<p>\u0414\u043b\u044f \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0449\u0435\u0433\u043e SSD \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u0435 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b:<\/p>\n<pre># pvcreate \/dev\/sdb\n# vgextend vg_root \/dev\/sdb\n# lvcreate -L 16G -n cache_meta vg_root \/dev\/sdb\n# lvcreate -l 90%FREE -n cache_data vg_root \/dev\/sdb\n# lvconvert --type cache-pool --poolmetadata vg_root\/cache_meta vg_root\/cache_data\n# lvconvert --type cache --cachemode writeback --cachepool vg_root\/cache_data vg_root\/lv_root<\/pre>\n<p>\u0427\u0442\u043e\u0431\u044b \u0443\u0437\u043d\u0430\u0442\u044c \u0442\u0435\u043a\u0443\u0449\u0438\u0439 \u0440\u0435\u0436\u0438\u043c \u0440\u0430\u0431\u043e\u0442\u044b SSD \u043a\u044d\u0448\u0430, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0439\u0442\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u0443:<\/p>\n<pre># lvs -o+cache_mode vg_root<\/pre>\n<p>\u0414\u043b\u044f \u0441\u043c\u0435\u043d\u044b \u0440\u0435\u0436\u0438\u043c\u0430, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u043a\u043e\u043c\u0430\u043d\u0434\u044b:<\/p>\n<pre># lvchange --cachemode writeback root\n# lvchange --cachemode writethrough root<\/pre>\n<p>\u0415\u0441\u043b\u0438 \u0432\u0430\u043c \u043d\u0443\u0436\u043d\u043e \u0437\u0430\u043c\u0435\u043d\u0438\u0442\u044c SSD \u0434\u0438\u0441\u043a, \u043e\u0431\u044f\u0437\u0430\u0442\u0435\u043b\u044c\u043d\u043e \u043d\u0443\u0436\u043d\u043e \u0443\u0434\u0430\u043b\u0438\u0442\u044c \u043a\u044d\u0448:<\/p>\n<pre># lvconvert --uncache \/dev\/vg_root\/lv_root\n# lvremove \/dev\/vg_root\/cache_meta\n# vgreduce vg_root \/dev\/sdb\n# pvremove \/dev\/sdb<\/pre>\n<p>\u0415\u0441\u043b\u0438 \u0434\u0438\u0441\u043a \u0441\u043e\u0432\u0441\u0435\u043c \u043e\u0442\u0432\u0430\u043b\u0438\u043b\u0441\u044f \u0442\u043e<\/p>\n<pre># vgreduce vg_root --removemissing\n# lvchange -a y \/dev\/vg_root\/lv_root<\/pre>\n<p>\u041f\u0440\u043e\u0441\u043c\u043e\u0442\u0440 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438 \u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438:<\/p>\n<pre># lvs -a -o +devices,cache_total_blocks,cache_used_blocks,cache_dirty_blocks,cache_read_hits,cache_read_misses,cache_write_hits,cache_write_misses,segtype<\/pre>\n<p>\u041c\u043e\u0436\u043d\u043e \u0434\u043e\u0431\u0430\u0432\u0438\u0442\u044c \u0430\u043b\u0438\u0430\u0441<\/p>\n<pre># echo \"alias lvs-cache='lvs -a -o +devices,cache_total_blocks,cache_used_blocks,cache_dirty_blocks,cache_read_hits,cache_read_misses,cache_write_hits,cache_write_misses,segtype'\" &gt;&gt; ~\/.bashrc<\/pre>\n<p>\u0421\u043a\u0440\u0438\u043f\u0442 \u0441\u0442\u0430\u0442\u0438\u0441\u0442\u0438\u043a\u0438:<br \/>\nhttps:\/\/github.com\/standard-error\/lvmcache-statistics\/blob\/master\/lvmcache-statistics.sh<\/p>\n<pre>.\/lvmcache-statistics.sh \/dev\/vg_root\/lv_root<\/pre>\n<p>\u0414\u043b\u044f RHEL based \u043d\u0435 \u0437\u0430\u0431\u044b\u0432\u0430\u0435\u043c:<\/p>\n<pre>dracut -v -f<\/pre>\n<p>\u0438\u043b\u0438<\/p>\n<pre>dracut -v -f --regenerate-all<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u0414\u043b\u044f \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043a\u044d\u0448\u0438\u0440\u0443\u044e\u0449\u0435\u0433\u043e SSD \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \u0432\u044b\u043f\u043e\u043b\u043d\u0438\u0442\u0435 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0435 \u043a\u043e\u043c\u0430\u043d\u0434\u044b: # pvcreate \/dev\/sdb # vgextend vg_root \/dev\/sdb # lvcreate -L 16G -n<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,103],"tags":[116,10,52],"class_list":["post-311","post","type-post","status-publish","format-standard","hentry","category-linux","category-lvm","tag-cache","tag-linux","tag-lvm"],"_links":{"self":[{"href":"https:\/\/fewit.ru\/index.php?rest_route=\/wp\/v2\/posts\/311","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fewit.ru\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fewit.ru\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fewit.ru\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fewit.ru\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=311"}],"version-history":[{"count":4,"href":"https:\/\/fewit.ru\/index.php?rest_route=\/wp\/v2\/posts\/311\/revisions"}],"predecessor-version":[{"id":328,"href":"https:\/\/fewit.ru\/index.php?rest_route=\/wp\/v2\/posts\/311\/revisions\/328"}],"wp:attachment":[{"href":"https:\/\/fewit.ru\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fewit.ru\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fewit.ru\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}