SATA Harddisk order in debian squeeze
Hello list,
i have a really annoying problem with my small NAS system. I used a Kontron 986 Board with ULV-Celeron CPU, running 3 SATA-drives in Raid 5 for a couple of years. I used kernel 2.6.23 since, 3 or 4 months ago, because this was the latest kernel at the time i installed the system. The OS (debian lenny-beta i think) was running from CF-Card, mounted as /dev/hda. The md-raid was assembled from /dev/sda, sdb, sdc and workes fine.
3 or 4 months ago i want to upgrade the raid with more disk space and installed sata disk 4 as spare drive. Doing maintainance on the box, i upgraded to latest bios-firmware und does an dist-upgrade to lenny with kernel 2.6.32. All was running fine, but cf-card was mounted as /dev/sda! That was no problem i thought, while all sata-drives are available as /dev/sdb, etc...
Now i rebooted the box and the raid was degraded!? Waht happended? The CF-Card is available as /dev/sde and all disks are counted from /dev/sda! At every reboot the order is changing and i dont know why!
In Bios, the SATA-Ports are set to AHCI and the Init-Order ist PATA before SATA. That seems right, but the behavior changes at every reboot.
-> I dont know if this is a BIOS-problem (I created a support request at Kontron, but not still any answer from there) or causes the linux kernel this problem?
-> Is it possible to organize the /dev/sd* order by udev or so on? Can i create a rule to use the cf-card ALWAYS as /dev/sda?
Do you have any ideas?
Kind regards,
Markus
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Markus Neviadomski
Mail: mn@dieitexperten.de
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