Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Guia de Instalação descarregar pdf (Página 25)

Blacklisting By Device Type

}

You can use a devnode entry in the blacklist section of the configuration file to specify individual

devices to blacklist rather than all devices of specific type; this is not recommended, however. Unless

it is statically mapped by udev rules, there is no guarantee that a specific device will have the same

name on reboot. For example, a device name could change from /dev/sda to /dev/sdb on reboot.

By default, the following devnode entries are compiled in the default blacklist; the devices that these

entries blacklist do not generally support DM-Multipath. To enable multipathing on any of these

devices, you would need to specify them in the blacklist_exceptions section of the configuration

file, as described in Section 4.2.4, “Blacklist Exceptions”.

blacklist {

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

devnode "^hd[a-z]"

}

4.2.3. Blacklisting By Device Type

You can specify specific device types in the blacklist section of the configuration file with a device

section. The following example blacklists all IBM DS4200 device and all HP devices.

blacklist {

device {

vendor "IBM"

product "3S42" #DS4200 Product 10

}

device {

vendor "HP"

product "*"

}

4.2.4. Blacklist Exceptions

You can use the blacklist_exceptions section of the configuration file to enable multipathing on

devices that have been blacklisted by default. For example, by default, devices with vendor = "IBM"

and product = "S/390.*" are blacklisted since usually DASD devices are used for local storage. If you

do need to enable multipathing on these devices, uncomment the following lines in the configuration

file:

blacklist_exceptions {

device {

vendor "IBM"

product "S/390.*"

}

When specifying devices in the blacklist_exceptions section of the configuration file, you must

specify the exceptions in the same way they were specified in the blacklist. For example, a WWID

exception will not apply to devices specified by a devnode blacklist entry, even if the blacklisted

device is associated with that WWID. Similarly, devnode exceptions apply only to devnode entries,

and device exceptions apply only to device entries.

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Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Guia de Instalação Página 25