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31 views

Why does first inode of the `/` mounted partition and inode of `/` is different?

[~]$ stat -c %i / 2 As you can see in above, the inode for / is 2. But the First inode of /dev/sda2 is 11. [~]$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 ...
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1answer
33 views

What is kernel memory and user memory? (question about the term kernel page and the page cache)

Today, I have read through some documents about file system (http://tekrants.me/2014/07/14/linux-file-system-write/). And the term kernel page is mentioned several times in this article. I am now ...
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1answer
33 views

Reading ELF file after dropping caches

I have an eMMC backed Linux 3.10 development device (Android) and I am trying to better understand when Linux is actually reading from the eMMC as opposed to the page cache. Specifically, I am ...
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0answers
48 views

Linux - is it possible to limit VFS cache usage on a per-process basis

I'm trying to investigate performance degradations while running background copy operations (using dd to write or read large disk-images). Is it possible to limit VFS cache usage for a single ...
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1answer
318 views

Docker in Crouton - VFS consuming astronomical amounts of space

I'm attempting to help out a roommate who has installed Kubuntu on his Chromebook using Crouton (it's basically just a fancy chroot run within ChromeOS). I helped him get the Docker daemon running, ...
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1answer
33 views

How do I merge (without copying) two directories? [duplicate]

I have: $ find 1 2 -printf '%i %p\n' 40011805 1 40011450 1/t 40011923 1/a 40014006 1/a/e 40011217 1/a/q 40011806 2 40011458 2/y 40011924 2/a 40013989 2/a/e 40013945 2/a/w I want: <inode> ...
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0answers
38 views

What is dcache disconnected dentry?

I am trying to understand how NFS works in Linux. As I understand, a disconnected dentry is such a dentry that does not have a proper prefix in Dcache, i.e. there is dentry dir/file in dcache, but no ...
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1answer
70 views

Is there a way to achieve context-dependent path names (CDPN) on NFS?

In my GFS clusters I use the CDPN feature to have separate chrooted /dev/log directories on separate cluster nodes: /home/ftpuser/foo: lrwxrwxrwx 1 root root 18 Sep 26 2010 dev -> ...
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1answer
130 views

How do I temporarily extract a flash drive or HDD in Linux?

Suppose I mounted a disk in this way: mount /dev/sdb /mnt/tmp I have some files opened on this filesystem and don't want to unmount it. However I want to temporarily extract the device, then ...
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0answers
51 views

Tool for dumping Linux VFS superblock

From the dumpe2fs man page: dumpe2fs prints the super block and blocks group information for the filesystem present on device. So dumpe2fs will dump the filesystem superblock. Is there any such ...
0
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1answer
790 views

Centos VFS cannot open root device

Yesterday I did a kernel update on a virtual machine. When I restarted the machine unfortunately I got the error Kernel panic - not syncing VFS After some searching I found out I should go to GRUB ...
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0answers
190 views

Limiting the total size of samba's vfs_recycle by pruning oldest deleted files first

Running SerNet Samba 4.0.9 on CentOS 6.4 serving as an AD DC and fileshare for XP clients. Added recycler per the example here. My concern is that the recycle dir will eventually grow large. ...
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2answers
523 views

Linux cache evictions

Looking at how the VFS cache on my Linux machine behaves, I can see that even when effectively idle (crond and most other daemons stopped, interfaces down) the amount of free memory gradually ...