On Wed, Mar 31, 2004 at 07:54:19AM +0200, Arnd Vehling wrote:
does anyone know how to fix the device name on a debian linux system? For example. If i have two IDE hardisks, the devices will be named like this.
/dev/hda /dev/hdb
If i now must remove the first harddisk (/dev/hda) the second (/dev/hdb) will be renamed to (/dev/hda) after the reboot. As i want /dev/hdb to be a mirror of /dev/hda and used as failover disk _without_ opening the case and tampering with the IDE bus setup, i want linux to keep the name /dev/hdb for the drive no matter what happens.
huh?
that's EXACTLY what linux does for IDE drives. the slave drive on the primary IDE controller will *always* be /dev/hdb, regardless of whether there is a master drive or not.
/dev/hda - master drive on primary IDE controller /dev/hdb - slave drive on primary IDE controller /dev/hdc - master drive on secondary IDE controller /dev/hdd - slave drive on secondary IDE controller
Is this possible?
it's standard.
Another question. How can i copy two identical discs _including_ the boot
block? "dd if=/dev/hda of=/dev/hdb" doesnt do it
don't use dd for that. set up a raid-1 mirror instead. it's easy to do, only about 5 minutes work.
also, for performance and safety, put your second drive on a separate IDE controller. that way it will still work even if one IDE controller fails. e.g. have /dev/hda (primary IDE master) and /dev/hdc (secondary IDE master) rather than /dev/hda & /dev/hdb.
and there are no raw devices on linux AFAIK.
/dev/hd? ARE the raw devices.
craig
In the bsdish slang, raw devices are character devices, so /dev/hd? are not exactly raw devices, but block devices.
There's support for accessing harddisks as character devices, see: http://www.linuxdocs.org/HOWTOs/SCSI-2.4-HOWTO/rawdev.html
José
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