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Hard Disk Performance issues Suse 11 SP1

 
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Old 08-21-2013
Hard Disk Performance issues Suse 11 SP1
hi guys

right now I have 6 Virtual Machines (VMs) running on Vmware ESXi 5.1 and attached to Storage SAN.
All these run Suse Linux 11 SP1 x64.

All of a sudden 1 of these VMs is running very slow making high CPU usage and I see al wait % kinda high 40-50%. Apparently since I don't own this virtual server the server was running fine and last change made was increasing memory

so I found out that test hard disk performance must be the issue
VM having issues. It so slow that I cancel the command but it's running at 2.7 MB

Code:
dd if=/dev/zero of=test bs=1048576 count=2048
781+0 records out
818937856 bytes (819 MB) copied, 298.699 s, 2.7 MB/s

running dd command on any of the other VMs linux server is about 280MB - 310 MB/s

Code:
dd if=/dev/zero of=test3 bs=1048576 count=2048
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 7.64361 s, 281 MB/s

any idea what could be causing this issue or how to fix it?

thanks a lot
 
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LEARN ABOUT SUSE

grub-install.unsupported

GRUB-INSTALL(8) 							FSF							   GRUB-INSTALL(8)

NAME

       grub-install - install GRUB on your drive

SYNOPSIS

       grub-install [OPTION] install_device

DESCRIPTION

       Install GRUB on your drive.

       -h, --help
	      print this message and exit

       -v, --version
	      print the version information and exit

       --root-directory=DIR
	      install GRUB images under the directory DIR instead of the root directory

       --grub-shell=FILE
	      use FILE as the grub shell

       --no-floppy
	      do not probe any floppy drive

       --force-lba
	      force GRUB to use LBA mode even for a buggy BIOS

       --recheck
	      probe a device map even if it already exists

       INSTALL_DEVICE can be a GRUB device name or a system device filename.

       grub-install  copies GRUB images into the DIR/boot directory specfied by --root-directory, and uses the grub shell to install grub into the
       boot sector.

       The grub source distribution carries this script to ease the installation of grub as a boot loader. In Suse Linux however,  grub  installa-
       tion  is  much  better handled by Yast; use of this script is generally discouraged and therefore unsupported. Consequently, the script has
       been renamed to grub-install.unsupported.

       In order to (re-)install grub for the currently running system, simply use Yast. For an installation aiming  at	a  differing  system,  the
       crafting  of an appropriate device.map and grub shell script is strongly advised, e.g.  "grub --batch --device-map=target-device.map < tar-
       get-grub.conf"

SEE ALSO

       The full documentation for grub-install is maintained as a Texinfo manual.  If the info and grub-install programs are properly installed at
       your site, the command

	      info grub-install

       should give you access to the complete manual.

grub-install (GNU GRUB 0.97)					     May 2005							   GRUB-INSTALL(8)