|
||||
[DEPRECATED] FreeBSD [GUID] GPT howto
The next hot thing after 7.1R is GPT
old limit of 4 partitions is finally history with GUID Partition table you can have up to 128 partitions. Should i also say, that GPT will easily handle partitions over 2TB MBR had problems with that As soon as i heard [thanks to nsayers post]that it's possible to boot FreeBSD from GPT i had to test it I have encountered some problems that i resolved on my own. That's why i'm making this howto, so you don't have to spend few hours, just because something went wrong. OK, here we go: ================================= Preparing: You'll need (or other media): usb-flash FreeBSD 7.1R DVD or FreeBSD-7.1R fixit cd Backup data During process we will delete all data on HDD, so backup your valuable data and system, if you already have 7.1R on your PC If you don't you need to upgrade your system to 7.1 [dunno if GPT works with 6.4] before and after upgrading backup all data I suggest you use GENERIC kernel, if you won't have right option, you can create system on GPT, but you can't boot it [another my fallback] Copy necessary data You need to make copy of /boot/pmbr and /boot/gptboot because they are not on disks and this was my fallback nr1 You will need these files later. I will copy them to my usb-flash Once you have copied these files to some where, where you can get them, reboot in fixit mode [use cd] Creating GUID partition tables 1) Erase MBR and write GPT table Code:
$ gpt create -f ad0 2) Mount flash to /mnt 3) Create gpt boot partition Code:
$ gpt boot -b /mnt/pmbr -g /mnt/gptboot ad0 value behind argument -s must be size in sectors 1 sector is 512B I suggest no changing it, who know if in 7.2 size might change Also don't improvise to much, make sure boot partition is Nr 1 and root partition is Nr 2, otherwise you can't boot at all [another my fallback] Note that when i say boot partition it doesn't mean /boot, it's different. /boot is in same partition as root 4) Create root partition (i'll make 256MB) Code:
$ gpt add -t ufs -s 268435456 ad0 Code:
$ gpt show ad0 Code:
fixit# gpt show ad0 start size index content 0 1 PMBR 1 1 Pri GPT header 2 32 Pri GPT table 34 128 1 GPT part - FreeBSD boot 162 1048576 2 GPT part - FreeBSD UFS/UFS2 1048738 2097152 3 GPT part - FreeBSD UFS/UFS2 3145890 2097152 5 GPT part - FreeBSD UFS/UFS2 5243042 1048576 6 GPT part - FreeBSD UFS/UFS2 16777378 6291456 7 GPT part - FreeBSD UFS/UFS2 23068834 168926701 11 GPT part - FreeBSD UFS/UFS2 191995535 10485760 10 GPT part - FreeBSD UFS/UFS2 202401295 109051904 9 GPT part - FreeBSD UFS/UFS2 311533199 1048576 8 GPT part - FreeBSD swap 312581775 32 Sec GPT table 312581807 1 Sec GPT header Partitions that you already have created are accessible as /dev/ad0p1 and /dev/ad0p2 6) Create more partitions /usr (4GB) and /var (512MB) and /tmp (512MB) Code:
$ gpt add -t ufs -s 10485760 ad0 $ gpt add -t ufs -s 1048576 ad0 $ gpt add -t ufs -s 1048576 ad0 Code:
$ gpt add -t swap -s 1048576 ad0 Code:
$ gpt add -t ufs ad0 Code:
$ newfs -nL root /dev/ad0p2 $ newfs -nUL usr /dev/ad0p3 $ newfs -nUL var /dev/ad0p4 $ newfs -nUL tmp /dev/ad0p5 It's also easier to track partitions if you got many of them 10) Mount root and run restore, then mount and restore usr, var and home. After you're done, if you didn't use labels edit /etc/fstab remember labels are placed in /dev/ufs/ directory so for root it would look something like Code:
/dev/ufs/root / ufs rw 1 1 when you create partition without using -i key, which is used to change partition NR, GPT will start with 1 and increment automatically. so in this example swap will be /dev/ad0p5 and /home will be /dev/ad0p6 After you're done you can unmount partitions and reboot system. It should boot with GENERIC. If not, post here, I can resolve problems... like i did when i had to on my PC Note also that you don't need to create bsdlabels anymore TIP: it's also very easy to set up swap on most outer tracks of HDD if you're interested in this look at -b parameter in manual kernel options [make sure you have this in kernel config Code:
options GEOM_PART_GPT # GUID Partition Tables. common partition size cheat sheet for megabytes: sector count = 1024^2/512*MB_count for gigabytes: sector count = 1024^3/512*GB_count ========== 8KB = 16 sectors 32KB = 64 sect 64KB = 128 sect 256MB = 524288 sect 512MB = 1048576 sect 1GB = 2097152 sect 2GB = 4194304 sect 5GB = 10485760 sect 10GB = 20971520 sect If there's anything unclear please ask, i will answer and explain resources: man gpt EDIT: made few inaccuracy fixes Original thread https://forums.freebsd.org/showthread.php?t=1305 Last edited by graudeejs; 19th December 2010 at 07:14 PM. |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
HOWTO: FreeBSD CPU Scaling with cpufreq.ko | vermaden | Guides | 10 | 27th October 2010 07:58 AM |
HOWTO: Enemy Territory on FreeBSD | tangram | Guides | 0 | 9th June 2009 03:31 PM |
HOWTO: QEMU on FreeBSD | vermaden | Guides | 10 | 9th March 2009 07:10 PM |
FreeBSD howto: burning and ripping cd's | graudeejs | Guides | 9 | 31st December 2008 06:39 AM |
HOWTO: FreeBSD with CCACHE | vermaden | Guides | 10 | 9th July 2008 06:14 PM |