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Closed 8 years ago.
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We know Linux LV has active and inactive status. What's the difference between these two status?
Well...I google-d a lot these days and also referred to some books and documents,
1. If a LV is in active state, but not in a mount state, it can be seen by the Kernel, or
Kernel processes/threads can still use this LV.
2. If a LV is in inactive state, it cannot be available by the Kernel.
Hope that helps. Thanks.
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Closed 2 years ago.
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Hard links cannot span physical devices. Exactly this statement I read while understanding the concept of hard link in Linux. Can anyone help me to understand this ?
A filename, is a pointer to an inode.
So if you're not on the same drive, it's impossible to link a file, because the inodes belongs to a specific disk
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Closed 3 years ago.
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One of the data elements produced by the finger command gives information on how long a logged in session has been idle. Where does finger get that information from on RedHat? I've looked in /proc/<pid>/ but did not find anything useful, and the documentation doesn't go into the commands implementation.
So, where in the system is finger (or w) pulling this information from?
The finger program get's this information from utmp file located at /var/run/utmp.
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Closed 6 years ago.
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i found something on my linux systems i don't understand.
The files /var/spool/mail/root and /var/mail/root point to the same inode but the link count is 1. This is the same on a ubuntu and a centos server.
When i create hardlinks to a file the hardlink count increases with every new file.
Why is the link count just one?
That is because /var/mail is a symbolic link to /var/spool/mail.
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Closed 8 years ago.
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I want to modify sched.h to add in some scheduling algorithm. I use find / -name sched.h command finding a lot of results.But which one should I really modify ?
And in /usr/src,there are a lot of relating folders whose names are similiar. I'm using ubuntu14.04. Where are my real source code?
use uname -a to see which kernel you are currently running. After that, i would edit the /include/linux/sched.h for that kernel.
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Closed 9 years ago.
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I wanted to know what exactly does happen to a packet by the time it goes to a linux kernel, until it comes out of kernel and goes as application layer.
There is a nice paper PATH OF A PACKET IN THE LINUX
KERNEL STACK(pdf), with examples and links to the kernel source code.