Red Hat DEVICE-MAPPER MULTIPATH 5.2 Uživatelský manuál stáhnout pdf (Strana 12)

DotHill – Linux Device Mapper Multipath “How To” for Storage Revision 4

defaults {

udev_dir /dev

polling_interval 10

path_selector "round-robin 0"

path_grouping_policy multibus

getuid_callout "/sbin/scsi_id -g -u -s /block/%n"

prio_callout /bin/true

path_checker readsector0

rr_min_io 100

rr_weight priorities

failback immediate

no_path_retry fail

user_friendly_names yes

}

6.3.2 Blacklisted devices (devnode_blacklist)

The blacklisted devices section provides various options for specifying devices that are to be

exempt from Device Mapper Multipath control. Devices can specified by either their device

node name (devnode) or their WWID (wwid). The following lines exclude from a SCSI disk with

the specified WWID and all IDE devices Two other commented lines are shown as examples.

blacklist {

wwid SSEAGATE_ST318406LC_____3FE0QZN20000222895FJ

devnode "^hd[a-z]"

# devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"

# devnode "^cciss!c[0-9]d[0-9]*"

}

Using devnode names of the form sdx should be avoided since the devices to which the refer

can change as storage is reconfigured.

6.3.3 Per-storage-array (devices)

Settings in the per-storage-array section are used for all multipath devices presented by storage

arrays whose SCSI VENDOR ID and PRODUCT ID match entries in one of the device sections.

In the following example we set different attributes for devices presented by two different

models of Dot Hill storage arrays:

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Red Hat DEVICE-MAPPER MULTIPATH 5.2 Uživatelský manuál Strana 12