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Full Discussion: Help in monitoring performance problem in Linux
Operating Systems Linux Help in monitoring performance problem in Linux Post 302394942 by levic on Saturday 13th of February 2010 02:01:58 PM
Old 02-13-2010
Hi,

first of all i would likw to thank you a lot for all your help! i'm very appriciate it, so thanks a lot!

sda is my root filesystem. sdb is a disk which has LVM partition so i cant see it on mount command.
i have a rootvg with 3 filesystem which resides on both sdb and additional partition of sda.
i guess md-0 is the LVM as a total. (not sure).

anyway, so we can see the problem is in our disks, this why i have a high i/o wait and load.
in order to change the RAID, or even add more drives to the RAID 5 i need to break the raid, and currenlty its the wrost option, cause its a production machine.
what else can i do in oredr to increase performance?
addidng more cpu is not an option, cause i will still get the i.o wait. the processor will process the requerst much faster and still wait(and much more) to the disks.
i have a 8G RAM. perhaps i need to add more RAM for caching? i'm not sure how do i do that.

i'm not exactly sure i can say loud and clear, the disks are the problem

thanks.
 

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LEARN ABOUT PHP

pvck

PVCK(8) 						      System Manager's Manual							   PVCK(8)

NAME

       pvck - check physical volume metadata

SYNOPSIS

       pvck [-d|--debug] [-h|--help] [-v|--verbose] [--labelsector] PhysicalVolume [PhysicalVolume...]

DESCRIPTION

       pvck checks physical volume LVM metadata for consistency.

OPTIONS

       See lvm for common options.

       --labelsector sector
	      By  default, 4 sectors of PhysicalVolume are scanned for an LVM label, starting at sector 0.  This parameter allows you to specify a
	      different starting sector for the scan and is useful for recovery situations.  For example, suppose the partition table is corrupted
	      or  lost	on  /dev/sda, but you suspect there was an LVM partition at approximately 100 MB.  This area of the disk may be scanned by
	      using the --labelsector parameter with a value of 204800 (100 * 1024 * 1024 / 512 = 204800):

	      pvck --labelsector 204800 /dev/sda

	      Note that a script can be used with --labelsector to automate the process of finding LVM labels.

SEE ALSO

       lvm(8), pvcreate(8), pvscan(8) vgck(8)

Sistina Software UK					 LVM TOOLS 2.02.95(2) (2012-03-06)						   PVCK(8)
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