{"id":123,"date":"2012-12-21T14:30:22","date_gmt":"2012-12-21T20:30:22","guid":{"rendered":"http:\/\/lucasmanual.com\/blog\/?p=123"},"modified":"2012-12-21T14:30:22","modified_gmt":"2012-12-21T20:30:22","slug":"mdadm-raid5-how-to-replace-failed-drive-gpt-partition","status":"publish","type":"post","link":"https:\/\/lucasmanual.com\/blog\/mdadm-raid5-how-to-replace-failed-drive-gpt-partition\/","title":{"rendered":"mdadm Raid5 – How to replace failed drive GPT partition"},"content":{"rendered":"

Install gdisk. On debian squeeze you need to add main backports <\/strong>
\nvi \/etc\/apt\/source.list
\n#Add below<\/strong>
\ndeb http:\/\/backports.debian.org\/debian-backports squeeze-backports main contrib non-free
\n<\/code>
\nInstall gdisk <\/strong>
\naptitude install gdisk
\n<\/code>
\nDrive sdb1 failed? Show details of partition md0
\nmdadm --detail \/dev\/md0<\/code><\/p>\n

cat \/proc\/mdstat
\nPersonalities : [raid6] [raid5] [raid4]
\nmd0 : active raid5 sdc1[1] sdd1[2]
\n 3907028864 blocks level 5, 64k chunk, algorithm 2 [3\/2] [_UU]<\/p>\n

<\/code>
\nDrive sdb1 is already removed. but if you need to remove it manually you can: <\/p>\n

mdadm \/dev\/mmdadm \/dev\/md0 -r \/dev\/sdb1
\n<\/code>
\n SHUT DOWN IF YOU NEED TO REPALCE DRIVE. MAKE SURE NEW DRIVE IS STILL sdb.<\/strong>
\nLook how disk is structured and what partition type it has <\/strong>
\nsgdisk -p \/dev\/sdb
\nDisk \/dev\/sdb: 3907029168 sectors, 1.8 TiB
\nLogical sector size: 512 bytes
\nDisk identifier (GUID): 0ED13F81-6EEA-4E12-9F27-DD806CF1F09C
\nPartition table holds up to 128 entries
\nFirst usable sector is 34, last usable sector is 3907029134
\nPartitions will be aligned on 8-sector boundaries
\nTotal free space is 0 sectors (0 bytes)<\/p>\n

Number Start (sector) End (sector) Size Code Name
\n 1 34 3907029134 1.8 TiB FD00
\n<\/code>
\nNow copy partition A structure into partition B <\/strong><\/p>\n

#sgdisk -R=\/dev\/TO_THIS_DISK \/dev\/FROM_THIS_DISK<\/strong>
\nsgdisk -R=\/dev\/sdb \/dev\/sda
\n#Give new GUID since above options clones the disk including GUID<\/strong>
\nsgdisk -G \/dev\/sdb<\/code><\/p>\n

Now readd the drive to md0 <\/strong>
\n
\nmdadm \/dev\/md0 -a \/dev\/sdb1
\n<\/code>
\nCheck the status <\/strong>
\n
\ncat \/proc\/mdstat
\nPersonalities : [raid6] [raid5] [raid4]
\nmd0 : active raid5 sdb1[3] sda1[1] sdc1[2]
\n 3907028864 blocks level 5, 64k chunk, algorithm 2 [3\/2] [_UU]
\n [>....................] recovery = 0.0% (124204\/1953514432) finish=786.3min speed=41401K\/sec<\/code>
\nDone. Check back in few hours to see if it finished.<\/strong>
\nKeywords: fdisk,sdisk, sgdisk, gdisk,parted,gpt, mbr,raid5,mdadm,linux,debian,<\/p>\n","protected":false},"excerpt":{"rendered":"

Install gdisk. On debian squeeze you need to add main backports vi \/etc\/apt\/source.list #Add below deb http:\/\/backports.debian.org\/debian-backports squeeze-backports main contrib non-free Install gdisk aptitude install gdisk Drive sdb1 failed? Show details of partition md0 mdadm –detail \/dev\/md0 cat \/proc\/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid5 sdc1[1] sdd1[2] 3907028864 blocks level 5, 64k… Continue reading mdadm Raid5 – How to replace failed drive GPT partition<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,3,4],"tags":[],"class_list":["post-123","post","type-post","status-publish","format-standard","hentry","category-corporate","category-debian","category-linux","entry"],"_links":{"self":[{"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/posts\/123","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/comments?post=123"}],"version-history":[{"count":9,"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/posts\/123\/revisions"}],"predecessor-version":[{"id":657,"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/posts\/123\/revisions\/657"}],"wp:attachment":[{"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/media?parent=123"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/categories?post=123"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lucasmanual.com\/blog\/wp-json\/wp\/v2\/tags?post=123"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}