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| author | Jasper Ras <jras@hostnet.nl> | 2025-01-13 13:16:06 +0100 |
|---|---|---|
| committer | Jasper Ras <jras@hostnet.nl> | 2025-01-13 13:16:06 +0100 |
| commit | 9232b8d817d4cd4122947375156fa2fa1e9fba14 (patch) | |
| tree | e4feb77f2e508f008b78f722e91488bb9a3f3806 /3 resources/linux/device-mapper.md | |
| parent | ed0753ad224f0c65133bd7a63180257eecd9f5e3 (diff) | |
vault backup: 2025-01-13 13:16:06
Diffstat (limited to '3 resources/linux/device-mapper.md')
| -rw-r--r-- | 3 resources/linux/device-mapper.md | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/3 resources/linux/device-mapper.md b/3 resources/linux/device-mapper.md deleted file mode 100644 index f862496..0000000 --- a/3 resources/linux/device-mapper.md +++ /dev/null @@ -1,25 +0,0 @@ -Device mapper is a kernel driver to map physical block devices to virtual ones; this means that for example we can have many physical devices be represented by a single virtual one (linear mapping). - -How does it work? -[[TODO]] -What is its function in relation to multipath? - -Logical devices using device-mapper can be managed using `man 8 dmsetup` -``` -[jasras@n04.compute.vps2-lej1 ~]$ sudo dmsetup info 3600a098038314d736724566a67346538 -Name: 3600a098038314d736724566a67346538 -State: ACTIVE -Read Ahead: 256 -Tables present: LIVE -Open count: 1 -Event number: 3 -Major, minor: 253, 12 -Number of targets: 1 -UUID: mpath-3600a098038314d736724566a67346538 -``` - -If dmsetup cannot remove a device because a process still has it open, but lsof does not show any processes that open it, use `-f` which replaces the device with a fake that rejects all I/O. - ---- -[device-mapper](https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/device_mapper#device_mapper) -[dmsetup](https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/7/html/logical_volume_manager_administration/dmsetup#dmsetup)
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