Automount and autounmount of usb sticks / discs 
Wednesday, September 30, 2009, 16:45 - System
Posted by Administrator
Each partition of plugged in usb stick's should be accessible with automount.

My mountpoints will be /media/usb/part0, /media/usb/part1, ...

Example:

The fist plugged stick has two partitions. The second only one.

/media/usb/part0 ... first stick partition one
/media/usb/part1 ... first stick partition two
/media/usb/part2 ... second stick partition one

If the second stick is plugged in first:

/media/usb/part0 ... first stick partition one
/media/usb/part1 ... second stick partition one
/media/usb/part2 ... second stick partition two

/etc/udev/rules.d/90-local.rules
ACTION=="add", BUS=="usb", SUBSYSTEM=="block", KERNEL=="sd?[0-9]*", \
NAME="%k", PROGRAM="get_usbdisc_symlink", SYMLINK+="%c", OPTIONS+="nowatch"
OPTIONS+="nowatch" avoids removal by udev of the symlink after unmounting

/lib/udev/get_usbdisc_symlink
#!/bin/sh -e

. /lib/udev/rule_generator.functions

[ -h /dev/usbpart0 ] && \
echo usbpart$(raw_find_next_available $(ls /dev/usbpart[0-9]*)) || \
echo "usbpart0"

exit 0
#> apt-get install autofs5

/etc/auto.master
#+auto.master
/media/usb /etc/auto.usb --timeout=5 --ghost

My usb sticks will be unmounted after 5 seconds not being in use.
With "--ghost" /media/usb/partX will automatically created.

/etc/auto.usb
part0 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart0
part1 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart1
part2 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart2
part3 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart3
part4 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart4
part5 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart5
part6 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart6
part7 -fstype=auto,noexec,nodev,nodiratime,noatime,nosuid :/dev/usbpart7
To have readwrite access for users add ",uid=$UID,gid=$GID"

For more partitions extend the lines.



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ssd optimizations 
Saturday, July 18, 2009, 21:07 - System
Posted by Administrator
* do partition alignment

Check if aligned at http://www.techpowerup.com/articles/other/157

Theodore Ts'o's blog post is somewhat misleading, as even that manufacturer's MLC SSDs have an erase block size of 512KiB (PDF), like OCZ's drives - not 128KiB. You're better off running fdisk -H 32 -S 32 /dev/sda, which will align partitions to 512KiB, and mke2fs -b 4096 -E stride=128,stripe-width=128 -t ext4 (128 * 4096B = 512KiB).

for partitioning see http://www.ocztechnologyforum.com/forum ... sing-fdisk

But without ATA TRIM your drive writes will decrease (depending on write usage)

The only solution seams to secure erase the whole drive and do a reinstall

* add "elevator=noop" to /boot/grub/menu.lst


Some tips i found but think this came from a myth:

* use a tempdir for logs

/etc/fstab
tmpfs /var/log tmpfs defaults,noatime,mode=0755 0 0
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/tmp tmpfs defaults,noatime,mode=1777 0 0

/etc/rc.local
for dir in apparmor apt ConsoleKit cups dist-upgrade fsck installer news samba unattended-upgrades; do
mkdir -p /var/log/$dir
done

* Set Firefox Cache to RAM
in about:config set browser.cache.disk.enable to false

* change the file system mount options on SSDs to "noatime"

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ubuntu 8.10 (intrepid ibex) troubles with an old Acer Travelmate 630 
Thursday, November 6, 2008, 15:29 - System
Posted by Administrator
I could not run the ubuntu live installcd and also the alternate hang sometimes. After a successful install X freezes. I tried to boot with various boot options. Only with acpi=off my system seams to working but with fan running and no battery info. An older knoppix was running, so i decided to install older ubuntu kernels and saw my system running with a gutsy kernel (2.6.22) but not with a hardy kernel (2.6.24).

What changed inside the kernel?

After searching a lot i found pci=nommconf.

It seams that something in the way pci is configured has changed.

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script to rescue/backup a raid1 system and restore from a cd with initramfs 
Tuesday, October 28, 2008, 10:05 - System
Posted by Administrator
Searching for a rescue system that creates a bootable CD to restore my system i found mkcdrec. Because sometimes things (mkcdrec/debian/ubuntu) changes and i had to test and patch for new mkcdrec versions, so i droped it.

Then i started to make a live CD with debian-live and make my install script by myself. I also dropped it (long boottime and had too much to hack to let it work like i wanted).

Now i had the idea to build my own script that tar's my system and builds a bootable cd. I liked the idea of initramfs to extend it like i will and it boots much faster. The only drawback is that all things are hardcoded and have to be changed for every system i backup. But its only a single script: Read More...

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script to rescue/backup a system and restore from a cd with initramfs 
Friday, September 5, 2008, 13:35 - System
Posted by Administrator
Searching for a rescue system that creates a bootable CD to restore my system i found mkcdrec. Because sometimes things (mkcdrec/debian/ubuntu) changes and i had to test and patch for new mkcdrec versions, so i droped it.

Then i started to make a live CD with debian-live and make my install script by myself. I also dropped it (long boottime and had too much to hack to let it work like i wanted).

Now i had the idea to build my own script that tar's my system and builds a bootable cd. I liked the idea of initramfs to extend it like i will and it boots much faster. The only drawback is that all things are hardcoded and have to be changed for every system i backup. But its only a single script: Read More...

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