|VDEV_ID.CONF(5)||File Formats Manual||VDEV_ID.CONF(5)|
configuration file for vdev_id(8)
vdev_id.conf file uses a simple format
consisting of a keyword followed by one or more values on a single line. Any
line not beginning with a recognized keyword is ignored. Comments may
optionally begin with a hash character.
The following keywords and values are used.
- alias name devlink
- Maps a device link in the /dev directory hierarchy
to a new device name. The udev rule defining the device link must have run
prior to vdev_id(8). A defined alias takes precedence
over a topology-derived name, but the two naming methods can otherwise
coexist. For example, one might name drives in a JBOD with the
sas_direct topology while naming an internal L2ARC
device with an alias.
name is the name of the link to the device that will by created under /dev/disk/by-vdev.
devlink is the name of the device link that has already been defined by udev. This may be an absolute path or the base filename.
- channel [pci_slot] port name
- Maps a physical path to a channel name (typically representing a single disk enclosure).
- Additionally create /dev/by-enclosure symlinks to the disk enclosure sg devices using the naming scheme from vdev_id.conf. enclosure_symlinks is only allowed for sas_direct mode.
- Specify the prefix for the enclosure symlinks in the form
Defaults to “enc”.
- slot prefix new [channel]
- Maps a disk slot number as reported by the operating system to an alternative slot number. If the channel parameter is specified then the mapping is only applied to slots in the named channel, otherwise the mapping is applied to all channels. The first-specified slot rule that can match a slot takes precedence. Therefore a channel-specific mapping for a given slot should generally appear before a generic mapping for the same slot. In this way a custom mapping may be applied to a particular channel and a default mapping applied to the others.
- multipath yes|no
- Specifies whether vdev_id(8) will handle only dm-multipath devices. If set to yes then vdev_id(8) will examine the first running component disk of a dm-multipath device as provided by the driver command to determine the physical path.
- topology sas_direct|sas_switch|scsi
- Identifies a physical topology that governs how physical paths are mapped to channels:
- phys_per_port num
- Specifies the number of PHY devices associated with a SAS HBA port or SAS switch port. vdev_id(8) internally uses this value to determine which HBA or switch port a device is connected to. The default is 4.
- slot bay|phy|port|id|lun|ses
- Specifies from which element of a SAS identifier the slot number is taken.
The default is bay:
- read the slot number from the bay identifier.
- read the slot number from the phy identifier.
- use the SAS port as the slot number.
- use the scsi id as the slot number.
- use the scsi lun as the slot number.
- use the SCSI Enclosure Services (SES) enclosure device slot number, as reported by sg_ses(8). Intended for use only on systems where bay is unsupported, noting that port and id may be unstable across disk replacement.
- The configuration file for vdev_id(8).
A non-multipath configuration with direct-attached SAS enclosures and an arbitrary slot re-mapping:
multipath no topology sas_direct phys_per_port 4 slot bay # PCI_SLOT HBA PORT CHANNEL NAME channel 85:00.0 1 A channel 85:00.0 0 B channel 86:00.0 1 C channel 86:00.0 0 D # Custom mapping for Channel A # Linux Mapped # Slot Slot Channel slot 1 7 A slot 2 10 A slot 3 3 A slot 4 6 A # Default mapping for B, C, and D slot 1 4 slot 2 2 slot 3 1 slot 4 3
A SAS-switch topology. Note, that the channel keyword takes only two arguments in this example:
topology sas_switch # SWITCH PORT CHANNEL NAME channel 1 A channel 2 B channel 3 C channel 4 D
A multipath configuration. Note that channel names have multiple definitions - one per physical path:
multipath yes # PCI_SLOT HBA PORT CHANNEL NAME channel 85:00.0 1 A channel 85:00.0 0 B channel 86:00.0 1 A channel 86:00.0 0 B
A configuration with enclosure_symlinks enabled:
multipath yes enclosure_symlinks yes # PCI_ID HBA PORT CHANNEL NAME channel 05:00.0 1 U channel 05:00.0 0 L channel 06:00.0 1 U channel 06:00.0 0 L
/dev/by-enclosure/enc-L0 /dev/by-enclosure/enc-L1 /dev/by-enclosure/enc-U0 /dev/by-enclosure/enc-U1
A configuration using device link aliases:
# by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e
|May 26, 2021||Debian|