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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| linux:cmd:fclun [2016/02/23 15:53] – js | linux:cmd:fclun [2022/07/29 13:05] (current) – [multipath] js | ||
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| === multipathd === | === multipathd === | ||
| - first install multipathd <code bash>yum install device-mapper-multipath</ | - first install multipathd <code bash>yum install device-mapper-multipath</ | ||
| - | - copy multipath.conf in /etc | + | - copy multipath.conf in /etc or use multipath -t >/ |
| - restart multipathd <code bash> | - restart multipathd <code bash> | ||
| - alias in multipath.conf < | - alias in multipath.conf < | ||
| Line 28: | Line 28: | ||
| |- 1:0:0:1 sdc 8:32 active ready running | |- 1:0:0:1 sdc 8:32 active ready running | ||
| `- 2:0:0:1 sde 8:64 active ready running</ | `- 2:0:0:1 sde 8:64 active ready running</ | ||
| + | | ||
| + | <WRAP center round box 90%> | ||
| + | Example: | ||
| + | | ||
| + | A server node with 2 * fibre channel HBAs attached to a storage controller with 2 ports sees 4 devices: | ||
| + | /dev/sda, /dev/sdb, dev/sdc, and /dev/sdd. | ||
| + | |||
| + | Device Mapper (DM) Multipath creates a single device with a unique World Wide Identifier (WWID) that reroutes I/O to those four underlying devices according to the multipath configuration. | ||
| + | |||
| + | </ | ||
| + | |||
| === device mapper === | === device mapper === | ||
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| Physical volume "/ | Physical volume "/ | ||
| * show volume group <code bash> | * show volume group <code bash> | ||
| - | - create logical volume (-L <size in PE see above) <code bash> | + | - create logical volume (-L <size in PE see above) <code bash> |
| Logical volume " | Logical volume " | ||
| * show logical volume <code bash> | * show logical volume <code bash> | ||