Date: Fri, 17 Mar 2017 16:25:28 +0100 From: Matthias Apitz <guru@unixarea.de> To: freebsd-questions@freebsd.org Subject: Re: bootable ext. USB SSD for backup Message-ID: <20170317152528.GA3072@c720-r314251> In-Reply-To: <alpine.BSF.2.20.1703162320170.74703@wonkity.com> References: <20170316194612.GA1748@c720-r314251> <alpine.BSF.2.20.1703162320170.74703@wonkity.com>
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El día jueves, marzo 16, 2017 a las 11:32:14p. m. -0600, Warren Block escribió:
> It works. I've used USB 3 memory sticks of 16GB and larger with
> success. In some versions of FreeBSD, the boot loader is really slow on
> USB. Once you get past the really... slow... spinner... it is very
> usable. USB 2 is not as good, but can be tolerable and might be
> good enough with the write speeds of an SSD.
>
> However, some USB 3 memory sticks run really hot when connected to a USB
> controller. For example, the Lexar 128GB JDS55 gets so hot that people
> have reported melting of the plastic case. I can verify that level of
> heat, but have not left it in use long enough for melting. My Lexar
> 32GB JDS75 has similar transfer speeds but does not get meltingly hot.
I had not much interest in participate in the discussion about GiB, etc.
Meanwhile I did the following (all based on FreeBSD 12.0-CURRENT r314251 (amd64):
# gpart create -s gpt da0
gpart: geom 'da0': File exists
# gpart destroy -F da0
da0 destroyed
# gpart create -s gpt da0
da0 created
# gpart add -t freebsd-boot -s 512k -a4k -l ssdboot da0
da0p1 added
# gpart bootcode -b /boot/pmbr -p /boot/gptboot -i1 da0
partcode written to da0p1
bootcode written to da0
# gpart add -t freebsd-ufs -l ssdrootfs -b 1m -s 16g da0
da0p2 added
# gpart add -t freebsd-swap -l ssdswap -a 1m -s 2g da0
da0p3 added
# gpart add -t freebsd-ufs -l ssdbackupfs -a 1m da0
da0p4 added
# newfs -U -t /dev/gpt/ssdrootfs
# newfs -U -t /dev/gpt/ssdbackupfs
(re/ -t see below)
# gpart set -a active da0
active set on da0
# gpart show -l da0
=> 40 1953525088 da0 GPT (932G)
40 1024 1 ssdboot (512K)
1064 984 - free - (492K)
2048 33554432 2 ssdrootfs (16G)
33556480 4194304 3 ssdswap (2.0G)
37750784 1915772928 4 ssdbackupfs (914G)
1953523712 1416 - free - (708K)
# mount /dev/gpt/ssdrootfs /mnt
# cd /usr/src
# make installworld DESTDIR=/mnt
# make installkernel DESTDIR=/mnt
# make distrib-dirs DESTDIR=/mnt
# make distribution DESTDIR=/mnt
# cp /etc/rc.conf /mnt/etc
# cp -p /etc/c720.kbd /mnt/etc
# cp -p /etc/sysctl.conf /mnt/etc
# cp -p /boot/loader.conf /mnt/boot/
# cp -p /boot/device.hints /mnt/boot/
# cat > /mnt/etc/fstab <<EOF
/dev/gpt/ssdrootfs / ufs rw,noatime 1 1
/dev/gpt/ssdswap none swap sw 0 0
EOF
# chroot /mnt passwd root
Changing local password for root
New Password:
the SSD now boots fine ...
I had to switch off TRIM because the SSD does not support it:
# tunefs -t disable /dev/gpt/ssdrootfs
tunefs: issue TRIM to the disk cleared
# tunefs -t disable /dev/gpt/ssdbackupfs
tunefs: issue TRIM to the disk cleared
HIH someone (as well to understand that Linux is not FreeBSD and how the
things are organized in FreeBSD).
matthias
--
Matthias Apitz, ✉ guru@unixarea.de, ⌂ http://www.unixarea.de/ ☎ +49-176-38902045
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