Hi,
i have a FC SAN and just recognized that i can't extend it anymore due to MBR's limit of 2,2 TB.
So i need to change it to GPT.
This is the current layout:

Code:
ha-idg-2:~ # parted /dev/mapper/3600c0ff00012824b04af7a5201000000
GNU Parted 3.1
Using /dev/mapper/3600c0ff00012824b04af7a5201000000
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/3600c0ff00012824b04af7a5201000000: 2398GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  1081GB  1081GB  primary               lvm, type=8e
 2      1081GB  1593GB  512GB   primary               lvm, type=8e
 3      1593GB  1914GB  321GB   primary               lvm, type=8e

(parted) unit s
(parted) p
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/3600c0ff00012824b04af7a5201000000: 4683674624s
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start        End          Size         Type     File system  Flags
 1      2048s        2111327999s  2111325952s  primary               lvm, type=8e
 2      2111328256s  3111327999s  999999744s   primary               lvm, type=8e
 3      3111329792s  3738281087s  626951296s   primary               lvm, type=8e
When i understand it correctly, GPT needs 34 sectors. In the beginning of the disk i have 2048 sectors free, so this
should be no proplem. I just extended the disk, so also at the end there should be enough free sectors for the
secondary GPT. I have gdisk. Is that the respective tool ?
Does anyone have experiences in converting, some "best practise" ?
Of course i will copy the first sector and also the first 2048 sectors (You never know) with dd before.

Bernd