Archive for December, 2011

tune2fs - adjust tunable filesystem parameters on ext2/ext3/ext4 filesystems

tune2fs allows the system administrator to adjust various tunable filesystem parameters on Linux ext2, ext3, or ext4 filesystems.

The current values of these options can be displayed by using the -l option to tune2fs(8) program, or by using the dumpe2fs(8) program.

-c max-mount-counts

Adjust the number of mounts after which the filesystem will be checked by e2fsck(8). If max-mount-counts is 0 or -1, the number of times the filesystem is mounted will be disregarded by e2fsck(8) and the kernel.Staggering the mount-counts at which filesystems are forcibly checked will avoid all filesystems being checked at one time when using journaled filesystems.

-C mount-count

Set the number of times the filesystem has been mounted. If set to a greater value than the max-mount-counts parameter set by the -c option, e2fsck(8) will check the filesystem at the next reboot.

Getting the current Values:

[root@proxy ~]# tune2fs -l /dev/sdb1 |grep count
Inode count: 655360
Block count: 2620595
Reserved block count: 131029
Mount count: 12
Maximum mount count: 26
[root@proxy ~]#

Example:

So for a system that contains 5 partitions and is booted approximately once a month you could do the following to stagger the mount counts:

tune2fs -c 5 -C 0 partition1
tune2fs -c 5 -C 1 partition2
tune2fs -c 5 -C 2 partition3
tune2fs -c 5 -C 3 partition4
tune2fs -c 5 -C 4 partition5

SBDavid

KVM Architecture

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In the KVM architecture the virtual machine is implemented as regular Linux process, schedule by the
standard Linux scheduler. In fact each virtual CPU appears as a regular Linux process. This allows KVM to
benefit from all the features of the Linux kernel.

Device emulation is handle by a modified version of QEMU that provides an emulated BIOS, PCI bus, USB bus and a standard set of devices such as IDE and SCSI disk controllers, network cards, etc.

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Multi-domain SSL

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A multi domain certificate is best for organizations that have multiple unique domains hosted on a single server. This saves time and money while providing a high level of trust and security. Compare the cost of purchasing many individual certificates to purchasing a single multi-domain certificate (which can consolidate as many as 100 domain names)

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