recently we needed to expand storage space available on one of our servers. originally it was using RAID10 on 4 4TBSSD drives handled by Dell’s PERC h730p controller, we wanted to add 2 more 4TB drives and go from 8 to 12TB array. we’ve decided to be brave and use RAID10 -> RAID10 array expansion. and – surprisingly – we did not lose any data!<\/p>\n
<\/p>\n
first – make sure you take a backup of all data on such array. you should regularly backup your data anyway, especially when you plan to make risky operation like this. <\/p>\n
adding more disks to the raid10 is shown in this video – https:\/\/www.youtube.com\/watch?v=Rh_ZqE7foy8 ; it took few minutes of clicking in bios, most likely can be done with MegaCli command line tool, without a reboot. <\/p>\n
the expansion was quite slow, took over 24h. after that linux kernel happily reported:<\/p>\n
\r\nsd 0:2:2:0: [sdb] 23437636224 512-byte logical blocks: (12.0 TB\/10.9 TiB)\r\nsdb: detected capacity change from 8000046497792 to 12000069746688\r\n<\/pre>\nstructure of the block devices once raid expansion has finished shows new size for sdb, but not for the underlying partition, luks container and file system mounted from it – output from lsblk<\/i>:<\/p>\n
\r\nsdb 8:16 0 10.9T 0 disk\r\n\u2514\u2500sdb1 8:17 0 6.9T 0 part\r\n \u2514\u2500data 254:0 0 6.9T 0 crypt \/mnt\/data\r\n<\/pre>\n\/mnt\/data is btrfs partition<\/p>\n
we needed to expand sdb1, then luks sitting on top of it and – at the end extend btrfs:<\/p>\n
\r\napt-get install cloud-guest-utils\r\ngrowpart \/dev\/sdb 1\r\nCHANGED: partition=xxx start=xxx old: size=xxx end=xxxnew: size=xxxx,end=xxx\r\n<\/pre>\nat this point lsblk<\/i> will show:<\/p>\n
\r\nsdb 8:16 0 10.9T 0 disk\r\n\u2514\u2500sdb1 8:17 0 10.9T 0 part\r\n \u2514\u2500data 254:0 0 10.9T 0 crypt \/mnt\/data\r\n<\/pre>\nbtrfs that sits on top of luks’s \/dev\/mapper\/data still is not aware of the additional 4TB of space available ; btrfs filesystem show \/mnt\/data\/<\/i> reports still 6.9TB. the last step needed is:<\/p>\n
\r\nbtrfs filesystem resize max \/mnt\/online\/\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"recently we needed to expand storage space available on one of our servers. originally it was using RAID10 on 4 4TBSSD drives handled by Dell’s PERC h730p controller, we wanted to add 2 more 4TB drives and go from 8 to 12TB array. we’ve decided to be brave and use RAID10 -> RAID10 array expansion. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"class_list":["post-3082","post","type-post","status-publish","format-standard","hentry","category-tech"],"_links":{"self":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts\/3082","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/comments?post=3082"}],"version-history":[{"count":3,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts\/3082\/revisions"}],"predecessor-version":[{"id":3085,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/posts\/3082\/revisions\/3085"}],"wp:attachment":[{"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/media?parent=3082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/categories?post=3082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kudzia.eu\/b\/wp-json\/wp\/v2\/tags?post=3082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}