1. Add five new disks to the Virtual Machine
2. fdisk/dev/SDB, add three 1g partitions and set the type to FD (Linux raid autodetect)
3. dd If =/dev/SDB of =/dev/sdx BS = 1024 COUNT = 1 (copy the Partition Table of SDB to another disk)
Fdisk/dev/sdx and save it by W (otherwise, the device files in the/dev/sdxx partitions do not exist)
4. Create a raid0
Mdadm-C/dev/md0-l0-N2/dev/sdb1/dev/sdc1
Disable md0
Mdadm-S/dev/md0
Enable md0
Mdadm-A/dev/md0/dev/sdb1/dev/sdc1
5. Create raid1
Mdadm-C/dev/md1-L1-N2/dev/sdb2/dev/sdc2
CAT/proc/mdstat
Personalities: [raid0] [raid1]
Md1: Active raid1 sdc2 [1] sdb2 [0]
987904 blocks [2/2] [UU] md0: Active raid0 sdb1 [0] sdc1 [1]
1975680 blocks 64 K chunks
Unused devices: <none>
Format and mount. If/dev/md1 is mounted, change the disk.
Mdadm/dev/md0-F/dev/sdb2 (set sdb2 to fail)
Mdadm/dev/md0-r/dev/sdb2 (remove sdb2)
Mdadm/dev/md0-A/dev/sdb3 (add sdb3)
CAT/proc/mdstat
6. Create RAID5
Mdadm-C/dev/MD5-L5-N3/dev/sdd1/dev/sde1/dev/sdf1-x1/dev/sdc3
Mdadm/dev/MD5-F/dev/sdd1
Mdadm/dev/MD5-r/dev/sdd1
CAT/proc/mdstat (automatically add sdc3 to RAID5)
Mdadm/dev/MD5-A/dev/sdd1 (sdd1 becomes a hot backup disk)
7. Save all configurations
Echo device/dev/SD * [1-9]>/dev/mdadm. conf
Mdadm-d-s>/dev/mdadm. conf mdadm usage reference (to) mdadm is a tool for managing software raid in Linux. The following content comes from the manpage: basic syntax: mdadm [mode] [Options] [mode] There are 7 types: assemble: adds an array previously defined to an existing array. Build: Build a legacy array, each device has no superblockscreate: Create a new array, each device has a superblocksmanage: Management array, such as add or removemisc: an operation can be performed on a device in the array, for example, removing superblocks or terminating an array in use. Follow or monitor: monitor the statuses of RAID, and multipath grow: Change the raid capacity or the number of devices in the array. Available [Options]:-A, -- assemble: add a previously defined array-B, -- Build: Build a legacy array without superblocks. -C, -- create: Create a new array-Q, -- Query: view a device and determine whether it is a MD device or a part of an MD array-D, -- detail: print the details of one or more MD devices-E, -- examine: print the content of the MD superblock on the device-F, -- follow, -- monitor: select the monitor mode-G, -- grow: change the size or form of the array in use-h, -- help: Help Information. After the preceding options are used, the options -- Help-options-V, -- version-V, -- verbose: Show Details-B, -- Brief: less details are displayed. Used for -- detail and -- Examine options-F, -- force-C, -- Config =: Specify the configuration file. The default value is/etc/mdadm. conf-S, -- Scan: scan the configuration file or/proc/mdstat to search for lost information. Configuration file/etc/mdadm. confcreate or build options:-C, -- chunk =: Specify chunk size of kibibytes. the default value is 64. -- rounding =: Specify rounding factor for Linear Array (= chunk size)-L, -- level =: Set the raid level. -- create available: linear, raid0, 0, stripe, raid1, 1, mirror, raid4, 4, RAID5, 5, raid6, 6, multipath, MP. -- Build available: linear, raid0, 0, stripe. -P,
-- Parity =: Set the RAID 5 parity rules: eft-asypolicric, left-semi Ric,
Right-asypolicric, right-connected Ric, La, Ra, ls, Rs. the default value is left-connected Ric -- layout =: similar to -- parity-N, -- raid-devices =: specify the number of available devices in the array. The value can only be changed to-X by -- grow, -- spare-devices =: specify the number of surplus devices in the initial array-Z, -- size =: total space obtained from each device after raid1/0/6 is set up -- assume-clean: currently, it is only used for -- Build option-R, -- run: when a part of the array appears in another array or file system, mdadm confirms the array. This option is not confirmed. -F, -- force: Generally, mdadm does not allow creating arrays with only one device, and a device is used as missing drive when creating RAID 5. This option is the opposite.
-A, -- Auto {= No, yes, MD, MDP, part, p} {NN }:
