Hardware :: Adding / Removing Drive Names Changed
Sep 29, 2010
After a couple of years, I decided this weekend to replace my old slackware 10.2 with the latest stable version 13.1 64 bit. The change log tells me that with the new kernel 2.6, the old IDE/ATA system has been removed and the libata is used instead. That /dev/hda become /dev/sda and so on. No problem sofar, however ...
My FIRST hardware configuration was:
One SATA drives connected to the onboard SATA controller [A]
Two PATA drive connected to PCI IDE controller 1 [B & C]
Two PATA drive connected to PCI IDE controller 2 [D & E]
One PATA drive connected to the onboard IDE controller [F]
So initially the system had 6 disk drives. Booting from the Slackware install dvd, I found out that the drives are detected in the following order.
Onboard SATA controller
PCI IDE Controllers
Onboard IDE Controller
And the drives are get names in the following order:
/dev/sda : SATA disk @ Onboard SATA controller
/dev/sdb : first PATA disk @ PCI IDE controller 1
/dev/sdc : seconde PATA disk @ PCI IDE controller 1
/dev/sdd : first PATA disk @ PCI IDE controller 2
/dev/sde : seconde PATA disk @ PCI IDE controller 2
/dev/sdf : PATA disk @ Onboard IDE controller 1
sda upto sde are configured to us with LVM, so 4 disks are added to the volume group.
sdf is where Slackware is installed (sdf1 = swap; sdf5 = /boot; sdf6 /; sdf7 = /usr; sdf8 = /home; sdf9 = /var; sdf10 = /tmp)
Here is the problem:
When a 7th disk is added (another SATA drive @ Onboard SATA controller) then all names are changed like:
sda remains the same
sdb new added SATA drive
sdb -> sdc
sdc -> sdd
sdd -> sdf
sdf -> sdg
Obviously booting without LILO parameters results in a kernel panic, so I booted with: Linux boot=/dev/sdg root=/dev/sdg6. This does not give the kernel panic, but results in an option to check a drive and gives an option ctrl+d to boot normally. However it reboots and I get stuck at the same again.
How does LVM handle the naming shift of the drives? The 4 drives that are part of the volume group contain critical data!!! If needed, I can reinstall Slackware again from dvd with all 7 drives attached (to avoid naming shift), but how do I recover my volume group? What if one of the drives dies or is removed, then naming shift happens again.
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Mar 6, 2010
Server (LVM):
500GB
320GB
I want to install a new 500GB and remove the 320GB, of course moving the data on the 320GB to the new 500GB. I have an external 1TB in enclosure that I can plug in to move the data over, but how do I move only the data on the 320GB to it?? I found this [URL]. But that is only to move the data to a new replacement disk, but my external is only temporary to move the data from the 320GB until I remove it+install 500GB, then move the data back. Not enough space on the 500GB already on server to move everything from 320GB to it, just in case that seemed the obvious thing to do.
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Whether I need to partition the drive to 8e (Linux LVM) before doing? Which one is better? Below are my steps and please let me know if this the correct one.
Here's my steps:
1.) dmesg | grep sd (to check the newly added disks)
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as installed, my drives look like this:
When I add the extra hard drive, it looks like this:
I know there is a way to make an initrid and to use the uuid identifications for the drives, and even use labels instead of the long uuid's, but I'm unfamiliar with this process, so I was hoping somebody that's done this before might point me in the right direction.
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[code]....
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[code]....
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[code]....
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Just in case someone wants this, I'll post it. To use: first boot to some type of DOS environment in which you have the program "debug".
debug
-F 200 L1000 0
-A CS:100
xxxx:0100 MOV AX,301
xxxx:0103 MOV BX,200
xxxx:0106 MOV CX,1
xxxx:0109 MOV DX,80
NOTE: Type 80 for the primary hard drive - HD 0,
or type 81 for the secondary hard drive - HD 1.
In most cases, the primary hard drive is required 80.
xxxx:010C INT 13
xxxx:010E INT 20
xxxx:0110 (Leave this line blank. Press the <Enter> key to continue.)
-G
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Code:
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