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What you have done is a read speed test. if you are actually copying blocks to another device you have pauses in the reading while the other device is accepting the data you want to write, when this happens you can hit rotational latency issues on the read device (if it's a hard disk) and so it's often significantly faster to read 1M chunks off the HDD as ...


You need to have yum version 3.2.26 or above and if you don't have it install yum-utils package which comes with the yumdb script. Using yumdb you can set a certain package to be kept from being removed on updates. yum update yum yum install yum-utils yumdb set installonly keep kernel-2.6.32-279.2.1.el6.x86_64


Create the directory /etc/default/grub.d if it doesn't exist already. Create a file /etc/default/grub.d/myextraoption.cfg adding to the variable you want (Append to it only, with an extra space. You want to be careful to not clobber or mangle any existing data there.): GRUB_CMDLINE_LINUX_DEFAULT="${GRUB_CMDLINE_LINUX_DEFAULT} extra-option" Run ...


Check your /boot partition to see if its full. A frequent problem with Debian/Ubuntu systems is a full boot partition preventing apt from installing kernels, causing cryptic failures like this. This is what debian admins call "job security." I believe that for your OS you should be running a 3.2.00* kernel. Do a uname -a to see what kernel you are running, ...


grub 2.02 appears to source files matching /etc/default/grub.d/*.cfg in addition to /etc/default/grub. Maybe this works on whatever version your Ubuntu has, too.


Disclaimer: This isn't answering why your kernel crash, but about another measure against mail bot. For the defense against misbehaving bot, postfix 2.8 introduce one feature called postscreen. You can view the presentation from Postfix author about this feature. In short, it will add new layer of defence for your smtp server. Keeping kernel and postfix ...

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