hi all,
anyone knows how to test ssd using iozon, I am currently running iozone and I don't know if it is testing the ssd or just the RAM...
anyone knows a good tutorial (like a step-by-step)?
cannot find any in google..
Thanks! (3 Replies)
Hello,
I have few HDD and SSD installed in my RHEL 5 server. I want to know which disk are SDD and which are HDD. What command should I use?
Thanks (3 Replies)
Hello All Gr8 Linux Developers Out There,
Background
=========
I have created a ncurses application that is suppose to run only on the Linux's virtual console. This application will heavily utilize the ncurses windows to show window-based UI to the user. I am using CentOS5.x. The terminal for... (7 Replies)
Hi,
Recently I faced with need of analyze root disk. I figured out two possible ways to do it:
1. Practical. Boot from CD and run format
2. Theoretical. Create live upgrade boot environment on another disk, activate it, reboot, unmont all root disk partitions and run format.
I've already... (3 Replies)
Hello experts.
I am using Solaris 10(2005) on intel machine. I have installed Veritas Volume manager 5.0. I am unable to bring a disk error to online state. I would like to bring that disk to CDS format.
Commands i used and output are....
#vxdisk list
DEVICE TYPE ... (11 Replies)
ZEROFREE(8) System Manager's Manual ZEROFREE(8)NAME
zerofree -- zero free blocks from ext2, ext3 and ext4 file-systems
SYNOPSIS
zerofree [-n] [-v] [-f fillval] filesystem
DESCRIPTION
zerofree finds the unallocated, blocks with non-zero value content in an ext2, ext3 or ext4 filesystem (e.g. /dev/hda1) and fills them with
zeroes (or another octet of your choice).
Filling unused areas with zeroes is useful if the device on which this file-system resides is a disk image. In this case, depending on the
type of disk image, a secondary utility may be able to reduce the size of the disk image after zerofree has been run.
Filling unused areas may also be useful with solid-state drives (SSDs). On some SSDs, filling blocks with ones (0xFF) is reported to trig-
ger Flash block erasure by the firmware, possibly giving a write performance increase.
The usual way to achieve the same result (zeroing the unallocated blocks) is to run dd (1) to create a file full of zeroes that takes up
the entire free space on the drive, and then delete this file. This has many disadvantages, which zerofree alleviates:
o it is slow;
o it makes the disk image (temporarily) grow to its maximal extent;
o it (temporarily) uses all free space on the disk, so other concurrent write actions may fail.
filesystem has to be unmounted or mounted read-only for zerofree to work. It will exit with an error message if the filesystem is mounted
writable. To remount the root file-system readonly, you can first switch to single user runlevel (telinit 1) then use mount -o remount,ro
filesystem.
zerofree has been written to be run from GNU/Linux systems installed as guest OSes inside a virtual machine. In this case, it is typically
run from within the guest system, and a utility is then run from the host system to shrink disk image (VBoxManage modifyhd --compact, pro-
vided with virtualbox, is able to do that for some disk image formats).
It may however be useful in other situations: for instance it can be used to make it more difficult to retrieve deleted data. Beware that
securely deleting sensitive data is not in general an easy task and usually requires writing several times on the deleted blocks.
OPTIONS -n Perform a dry run (do not modify the file-system);
-v Be verbose;
-f value Specify the octet value to fill empty blocks with (defaults to 0). Argument must be within the range 0 to 255.
SEE ALSO
dd (1).
AUTHOR
This manual page was written by Thibaut Paumard <paumard@users.sourceforge.net> for the Debian system (but may be used by others). Permis-
sion is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or any later
version published by the Free Software Foundation.
On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2.
ZEROFREE(8)