ssd optimizations 
* 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"

[ view entry ] ( 2176 views )   |  print article
ubuntu 8.10 (intrepid ibex) troubles with an old Acer Travelmate 630 
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.

[ view entry ] ( 881 views )   |  print article
script to rescue/backup a raid1 system and restore from a cd with initramfs 
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...

[ view entry ] ( 935 views )   |  print article
script to rescue/backup a system and restore from a cd with initramfs 
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...

[ view entry ] ( 1054 views )   |  print article
qemu 
#> sudo apt-get install kqemu-source kqemu-common build-essential
#> sudo module-assistant prepare kqemu
#> sudo module-assistant auto-install kqemu

/etc/udev/rules.d/60-kqemu.rules:
KERNEL=="kqemu", NAME="%k", MODE="0660", GROUP="kqemu"

#> sudo addgroup --system kqemu
#> sudo adduser USERNAME kqemu
#> modprobe kqemu

create a qemu image:
#> qemu-img create -f qcow2 root.qcow2 20G

install with a cd:
#> qemu -hda root.qcow2 -cdrom cd.iso -boot d

boot installed system:
#> qemu -hda root.qcow2


[ view entry ] ( 686 views )   |  print article

<<First <Back | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | Next> Last>>