On Mon, 19 Nov 2012, Snow Mountains wrote:
2012/11/18 Shane Ambler <free...@shaneware.biz>:
On 18/11/2012 06:49, Snow Mountains wrote:
Could you recommend a reliable document on how to do a correct block
alignment for new FreeBSD 9 install? FreeBSD Handbook doesn't
mention this at all, although I can find a lot of (not quite
consistent) advises on the net on how to do it with gpart/newfs.
Over the last week there has been a discussion with the subject
"Advanced Format Drive ?" on this list that has been discussing that.
If you only just signed up then you can search for it in the mail archives.
There is a lot of useful info there, and I also found a lot of useful
tips from Warren Block on how to create swap as a file, how to use
tmpfs, about noatime etc.
I didn't say anything about noatime, and personally have not done that
on SSDs.
However, nowhere I can found anything that
could explain me for sure how to do this BEFORE that:
I've got 240G Kingston SSD. I want this:
win7:
ada2s1 ~ 30G empty (probably for experimental little win7 install in
the future)
freebsd9:
ada2s2a ~3G for /
ada2s2d ~80G the for /usr (separated for easier backup)
ada2s2f ~ the rest for storage
How to do this with gpart, respecting 4g alignment etc? Can anybody
share the exact commands to achieve this?
That's "4K".
Most of the following is shown in the new Handbook gmirror section:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-mirror.html
Create the MBR partitioning scheme:
# gpart create -s mbr ada2
Add MBR bootcode:
# gpart bootcode -b /boot/mbr ada2
Add the Windows 7 partition, forcing it to start at block 2048 because
"-a" is not going to do what is expected for slices because of
decades-old CHS stuff:
# gpart add -t ntfs -b 2048 -s 30g ada2
Create the FreeBSD slice:
# gpart create -s bsd ada2s1
Set this slice active and add FreeBSD bootcode:
# gpart set -a active -i 1 ada2s1
# gpart bootcode -b /boot/boot ada2s1
Add the FreeBSD partitions. -a will work here, aligning the partitions.
# gpart add -t freebsd-ufs -a 4k -l dxrootfs -s 3g ada2s1
# gpart add -t freebsd-ufs -a 4k -l dxvarfs -s 1g ada2s1
# gpart add -t freebsd-ufs -a 4k -l dxusrfs ada2s1
Note the use of GPT labels. The "dx" is just random go-fast letters
added because I believe it is a mistake to have duplicate labels and try
to keep them all unique. Pick your own.
/etc/fstab entries are /dev/gpt/dxrootfs, /dev/gpt/dxvarfs,
/dev/gpt/dxusrfs.
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