January 2006
Intermediate to advanced
226 pages
6h 11m
English
book
Linux for IBM System z9 and IBM zSeries
by Gregory Geiselhart, Robert Brenneman, Eli Dow, Klaus Egeler, Torsten Gutenberger, Bruce Hayden, Livio Sousa
Content preview from Linux for IBM System z9 and IBM zSeries
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Chapter 5. FCP-attached SCSI disks 165
This can lead to a unpredictable situation when new SCSI disks are added to the
system. For example, consider a Linux server with SCSI disks accessed using
an FCP device at address 0x0010 and mapped to device node /dev/sda. Adding
additional SCSI disks accessed by an FCP device at address 0x000A causes
this device to be mapped to /dev/sda on system reboot (the device at address
0x0010 is then mapped to /dev/sdb).
In the Linux 2.6 kernel, udev provides a predictable mechanism to map SCSI
disks to their respective device nodes. This improves system reliability; after
system reboot (or in the event of channel path failure and recovery), SCSI device
node assignments remain unchanged. Both RHEL4 and SLES9 ...
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