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computing:storage:linux_software_raid
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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computing:storage:linux_software_raid [2011/11/27 10:34] gcooper |
computing:storage:linux_software_raid [2019/10/25 10:42] (current) gcooper |
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| Line 16: | Line 16: | ||
| < | < | ||
| - | mdadm --detail --scan | + | mdadm --detail --scan |
| </ | </ | ||
| Line 22: | Line 22: | ||
| < | < | ||
| - | fdisk /dev/sda | + | fdisk -l /dev/sda |
| </ | </ | ||
| + | |||
| + | or | ||
| + | |||
| + | < | ||
| + | sgdisk -p /dev/sda | ||
| + | </ | ||
| + | |||
| + | **Copy Patition Scheme**: https:// | ||
| + | |||
| + | :!: Verify '' | ||
| Using fdisk, create matching partitions on various drives (block devices) of type **fd Linux raid autodetect** that will be assembled into arrays. | Using fdisk, create matching partitions on various drives (block devices) of type **fd Linux raid autodetect** that will be assembled into arrays. | ||
| Line 39: | Line 49: | ||
| </ | </ | ||
| - | Once you partition the first drive, use sfdisk to duplicate | + | :!: Be careful not to write to the **wrong disk** or you will have a **very bad day**! |
| + | |||
| + | Once you partition the first drive, use '' | ||
| + | |||
| + | < | ||
| + | sfdisk -d /dev/sda | sfdisk /dev/sdb | ||
| + | </ | ||
| + | |||
| + | or | ||
| < | < | ||
| - | sfdisk -d / | + | sgdisk |
| + | sgdisk -G /dev/sdb | ||
| </ | </ | ||
| Line 55: | Line 74: | ||
| </ | </ | ||
| - | Here is a four-drive RAID5 example where one drive is a hot spare. | + | Here is a four-drive |
| < | < | ||
| mdadm --create /dev/md0 --level=5 --raid-devices=3 --spare-devices=1 --spare-group=groupname /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 | mdadm --create /dev/md0 --level=5 --raid-devices=3 --spare-devices=1 --spare-group=groupname /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 | ||
| </ | </ | ||
| - | |||
| - | http:// | ||
| ===== Add a Drive ===== | ===== Add a Drive ===== | ||
| + | |||
| + | http:// | ||
| < | < | ||
| - | mdadm --detail --scan | + | mdadm --detail --scan |
| mdadm --add /dev/md0 /dev/sdb1 | mdadm --add /dev/md0 /dev/sdb1 | ||
| Line 86: | Line 105: | ||
| mdadm --detail --scan --verbose > / | mdadm --detail --scan --verbose > / | ||
| </ | </ | ||
| + | |||
| + | ===== MBR and GRUB ===== | ||
| + | |||
| + | ==== MBR ==== | ||
| + | |||
| + | http:// | ||
| + | |||
| + | Assuming you have identical disks with identical partitioning, | ||
| + | |||
| + | < | ||
| + | dd if=/dev/sda of=/dev/sdb bs=512 count=1 | ||
| + | </ | ||
| + | |||
| + | ==== GRUB ==== | ||
| + | |||
| + | http:// | ||
| + | |||
| + | < | ||
| + | grub | ||
| + | </ | ||
| + | |||
| + | If you have a separate /boot partition: | ||
| + | |||
| + | < | ||
| + | grub> find / | ||
| + | </ | ||
| + | |||
| + | If you don't: | ||
| + | |||
| + | < | ||
| + | grub> find / | ||
| + | </ | ||
| + | |||
| + | Then, based on the output of the find command: | ||
| + | |||
| + | < | ||
| + | grub> root (hd0,0) | ||
| + | grub> setup (hd2) | ||
| + | </ | ||
| + | |||
| + | |||
computing/storage/linux_software_raid.1322415296.txt.gz · Last modified: 2011/11/27 10:34 by gcooper
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