Vvc: Persistent device name

2010-05-16T22:55:04Z

Persistent device name

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===Persistent device name in Linux===

Sometimes it's necessary to have a persistent device name, in case block device name changes, for [[DRBD]] for instance.

Lets say we need always be able to refer to a particular partition of a particular ATA disk. <br>
Since it can be /dev/hda, /dev/sda or /dev/sdb we can't rely on this name to stay permanent.<br>
To solve this create a following udev rule in
'''/etc/udev/rules.d/local.rules'''
KERNEL=="sd*[0-9]", PROGRAM=="/lib/udev/ata_id /dev/%b", RESULT=="ST3750640AS_3QD13TE9", SYMLINK+="diskB%n"

RESULT is a unique string returned by /lib/udev/ata_id /dev/sdb, for example

<pre>
# start_udev
# ls -l /dev/diskB*
lrwxrwxrwx 1 root root 4 May 16 22:31 /dev/diskB1 -> sdb1
lrwxrwxrwx 1 root root 4 May 16 22:31 /dev/diskB2 -> sdb2
</pre>

Now you can use '''/dev/diskB1''' in drbd.conf reliably.

[[Category:Linux]]

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Vvc: Persistent device name