Thank you for your answer.
I look your document and using "udev" to create "mydevXXX". This device is work, but NOT what I want.
The reason are:
1. what I want is my device sequence must:
boot and root on /dev/sda
swap on /dev/sdb
2. udev ONLT create a "link" from "mydevXXX" back to original. It did NOT official change device name.
e.g.:
lrwxrwxrwx 1 root root 3 Jul 1 11:19 mysda -> sdc
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysda1 -> sdc1
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysda2 -> sdc2
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysda3 -> sdc3
lrwxrwxrwx 1 root root 3 Jul 1 11:19 mysdb -> sdd
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysdb1 -> sdd1
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysdb2 -> sdd2
lrwxrwxrwx 1 root root 3 Jul 1 11:19 mysdc -> sde
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysdc1 -> sde1
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysdc2 -> sde2
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysdc3 -> sde3
lrwxrwxrwx 1 root root 3 Jul 1 11:19 mysdd -> sda
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysdd1 -> sda1
lrwxrwxrwx 1 root root 3 Jul 1 11:19 mysde -> sdb
lrwxrwxrwx 1 root root 4 Jul 1 11:19 mysde1 -> sdb1
--- 09/6/30 (二)，Thomas Fess <dfezz1@xxxxxxxxx> 寫道：
> 寄件者: Thomas Fess <dfezz1@xxxxxxxxx>
> 主旨: Re: How to change disk sequence on DELL R900 with LINUX
> 收件者: "General Red Hat Linux discussion list" <redhat-list@xxxxxxxxxx>
> 日期: 2009年6月30日,二,下午1:16
> Linux defines the devices as they
> come up or become available so depending on what your doing
> that this, it causes an issue. Such as san
> disks(multipathing) and mounts or ASM in oracle or whatever,
> you have to use another method to define a persistant name
> to the LUN/disk etc.
>
> http://dims.ncsa.uiuc.edu/set/san/src/linux-mpio.pdf
>
>
>
>
> ________________________________
> From: mcclnx mcc <mcclnx@xxxxxxxxxxxx>
> To: redhat-list@xxxxxxxxxx
> Sent: Tuesday, June 30, 2009 8:51:18 AM
> Subject: How to change disk sequence on DELL R900 with
> LINUX
>
>
> we have DELL R900 with REDHAT 5.3 in it. This DELL R900
> come with one integrate PERC6/I and two PERC6/E cards.
> DELL PERC 6/I control 5 internal disks. The original disk
> sequence are:
>
> /dev/sda1 /boot
> /dev/sda2 /
> /dev/sdb1 swap
> ...
>
> after I configured PERC 6/E disks and reboot, /dev/sda
> change to RAID disk and original /boot and / change to
> /dev/sde1 and /dev/sde2.
>
> My modprobe.conf is:
>
> alias scsi_hostadapter megaraid_sas
> alias scsi_hostadapter1 ata_piix
> alias eth0 bnx2
> alias eth1 bnx2
>
> how to change sequence back?
>
> Thanks.
>
>
>
>
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