QCOW2:
/dev/vda:
Timing cached reads: 9836 MB in 2.00 seconds = 4923.22 MB/sec
Timing buffered disk reads: 1050 MB in 3.00 seconds = 349.92 MB/sec

RAW:
/dev/vda:
Timing cached reads: 10118 MB in 2.00 seconds = 5064.57 MB/sec
Timing buffered disk reads: 1054 MB in 3.00 seconds = 351.32 MB/sec

LVM
/dev/vda:
Timing cached reads: 9328 MB in 2.00 seconds = 4668.90 MB/sec
Timing buffered disk reads: 202 MB in 3.00 seconds = 67.26 MB/sec

qcow2,488M,61454,88,288839,43,61540,14,45880,57,445361,57,13550.6,99,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
raw ,488M,54972,86,54393,16,60636,17,68490,84,442091,43,6685.1,97,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
lvm ,488M,58248,90,62764,17,58271,19,64677,83,455263,38,7912.3,96,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++

QCOW2
Version 1.03c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
vm2 488M 61454 88 288839 43 61540 14 45880 57 445361 57 13551 99
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
vm2,488M,61454,88,288839,43,61540,14,45880,57,445361,57,13550.6,99,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++

LVM
Version 1.03c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
vm2 488M 58248 90 62764 17 58271 19 64677 83 455263 38 7912 96
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
vm2,488M,58248,90,62764,17,58271,19,64677,83,455263,38,7912.3,96,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++


Then a spreadsheet with a large set of test using Ubuntu x64 9.04 host  with two ES SATA disks and LVM over raid1/md.

I tried several methods last night including Unetbootin, and this is the one that worked best.

• Using Windows to prepare USB install of Ubuntu 8.10
• Preparing Files for USB Memory Stick Booting

Basically copy the ISO on the USB root directory, add vmlinuz and initrd.gz from main/installer-i386/current/images/hd-media/. Then add syslinux.cfg with:

default vmlinuz
append initrd=initrd.gz

If you have boot problems you might also need to run install-mbr /dev/sda from the mbr package.

• Tinydns / DJBDNS on Ubuntu Hardy Heron
• upstart breaks inittab

Before install touch /etc/inittab and afterwards add this to /etc/event.d/svscan:

start on runlevel 3
start on runlevel 4
start on runlevel 5

stop on runlevel 0
stop on runlevel 1
stop on runlevel 6

respawn
exec /usr/bin/svscanboot

We have compared the performance of Windows* and Linux*-based CIFS* (Samba*) servers for digital media applications and found that the ext3*-based Linux server’s throughput was up to 53% lower than the Windows server’s–although both used identical hardware (Figure 1). An XFS*-based Linux server had roughly the same performance as the Windows server. Our investigation shows that the difference lies in the filesystem allocation and handling of sparse files. In particular, the Windows client makes an assumption that the CIFS fileserver uses NTFS*, a filesystem that assumes files will be data-full (not sparse). This contradicts a fundamental assumption of ext3–that files are sparse–and leads to fragmentation of files and degraded performance on ext3. Further, we’ve seen this behavior manifested for a broad range of media applications including iTunes*.

• Concise and clear explaination of linux load averages.
• Bug fix suggestion for VMware server which can hang on installation. Remove the floppy device. I’ve got another issue where a linux vm on vmware server hangs on startup and I’ll have to try this.

A solution to fix this issue is to use Linux source/policy routing. For example, for node with IP 192.168.10.1 and VPN server IP 172.29.148.1, route to subnet 192.168.9.0/24 out 172.29.148.1 via 172.29.148.2 with src (source) IP 192.168.10.1:


sudo ip route add to 192.168.9.0/24 src 192.168.10.1 via 172.29.148.2



kernel: XFS: Filesystem lvm(58,2) has duplicate UUID - can't mount


Using the following:


mount -o ro,nouuid /dev/vg/lvsnap /mnt/


Thanks too.