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UNIX for Dummies Questions & Answers
Dual CPU's and 'top'
Post 38510 by davidg on Thursday 17th of July 2003 01:15:40 PM
07-17-2003
Hi,
Sorry to hook in this late, I hope we are still in time.
This is something you never want to see !!
Especialy with internal disks. Please make sure you have the latest top-patch installed ! If so take a closer look as top is not realy a good advisor on systemload, but of cours should still be a bit more accurate.
WIO is Waiting for IO and means that your disks are so bussy that another request for IO had to be put into wait. Your system will take it of waiting after a while again and will retry in a moment.
WIO is slowing down your server a lot. This can be caused by swap as well (running out of memory).
Anyway, for a good check you should do the following :
sar -u 2 20 # This will tell you the actual cpu usage
sar -d 2 20 # If wio keeps high, check the disk and see which one it is
You'dd better check the disk if this is just a single disk. ES should replace the disk/fibre channel or whatever if it's realy staying at such a load.
Most of all a "format" --> specify the bussy disk --> analyze --> read , should come up with timout errors. keep a "tail -f /var/adm/messages" open !
I think this is more than enough food for you now
Let me know if I was in time, or if you need some extra help.
Regs David
Sorry to hook in this late, I hope we are still in time.
This is something you never want to see !!
Especialy with internal disks. Please make sure you have the latest top-patch installed ! If so take a closer look as top is not realy a good advisor on systemload, but of cours should still be a bit more accurate.
WIO is Waiting for IO and means that your disks are so bussy that another request for IO had to be put into wait. Your system will take it of waiting after a while again and will retry in a moment.
WIO is slowing down your server a lot. This can be caused by swap as well (running out of memory).
Anyway, for a good check you should do the following :
sar -u 2 20 # This will tell you the actual cpu usage
sar -d 2 20 # If wio keeps high, check the disk and see which one it is
You'dd better check the disk if this is just a single disk. ES should replace the disk/fibre channel or whatever if it's realy staying at such a load.
Most of all a "format" --> specify the bussy disk --> analyze --> read , should come up with timout errors. keep a "tail -f /var/adm/messages" open !
I think this is more than enough food for you now
Let me know if I was in time, or if you need some extra help.
Regs David
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LEARN ABOUT HPUX
vximportdg
vximportdg(1M) vximportdg(1M) NAME
vximportdg - import a disk group into the Veritas Volume Manager configuration SYNOPSIS
vximportdg daname new_dgname DESCRIPTION
The vximportdg utility performs a temporary import of the disk group contained on the disk device specified by daname to the disk group specified by new_dgname. As the persistent disk group information is not changed within the private partition of the affected disk, the import is only valid for the duration of the bootload or until a vxdg deport is performed. ARGUMENTS
daname Specifies the device name (disk access name) of one of the member disks of the disk group to be imported. The other members are imported automatically. new_dgname Specifies the disk group to be imported. USAGE
One reason to use the vximportdg utility is to import a second generation of the rootdg disk group so that its objects are available for use while a system is running on a different rootdg. To prevent volumes on the second generation rootdg from having the same device minor numbers as volumes (such as rootvol) on the active rootdg, the importation assigns temporary non-conflicting device minor numbers. If this occurs, vximportdg outputs warning messages detailing the mapping of the minor numbers. SEE ALSO
vxdg(1M) VxVM 5.0.31.1 24 Mar 2008 vximportdg(1M)