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Full Discussion: AIX Disk 'O' problem
Top Forums UNIX for Advanced & Expert Users AIX Disk 'O' problem Post 33430 by pjtalbot on Monday 6th of January 2003 06:09:09 AM
Old 01-06-2003
AIX Disk 'O' problem
Hello,

I'm running AIX 4.3 on an IBM RS6000 Machine with 9 SCSI drives and 4 processors.

The machine seems to cope fine when data is being written to it but slows down considerably when outputting data.

For example when I FTP a 1Gb file to the machine from an NT box, it goes on no problem in about 2 minutes. However, when I transfer the file back, it takes longer and the AIX machine grinds to a halt for all processes during the transfer.

When using Oracle SQL Loader to load a flat file to the database, it is faster to load the file from another machine over the network into the AIX Oracle instance that it is from the AIX machine to its own oracle instance.

We've used different machines to try and send data to the AIX machine and get the same results.

It appears to be an I/O bottleneck without the input bottleneck - (having used iostat to check the processor usage we found it was 86% idle) does anyone have any clues as to what might be wrong?
 

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LEARN ABOUT DEBIAN

vpo

VPO(4)							   BSD Kernel Interfaces Manual 						    VPO(4)

NAME

     vpo -- parallel to SCSI interface driver

SYNOPSIS

     device vpo

     For one or more SCSI busses:
     device scbus

DESCRIPTION

     The vpo driver provide access to parallel port Iomega Zip and Jaz drives.

HARDWARE

     The vpo driver supports the following parallel to SCSI interfaces:

     o	 Adaptec AIC-7110 Parallel to SCSI interface (built-in to Iomega ZIP drives)
     o	 Iomega Jaz Traveller interface
     o	 Iomega MatchMaker SCSI interface (built-in to Iomega ZIP+ drives)

USAGE

     The driver should let you use a printer connected to the drive while transferring data.

     DOS and FreeBSD file systems are supported.  When mounting a DOS file system or formating a FreeBSD file system, check the slice of the disk
     with the fdisk(8) utility.

     In order to unixify a ZIP disk, put the following in /etc/disktab:

     zip|zip 100:
	     :ty=removable:se#512:nc#96:nt#64:ns#32:
	     :pa#196608:oa#0:ba#4096:fa#512:
	     :pb#196608:ob#0:bb#4096:fb#512:
	     :pc#196608:oc#0:bc#4096:fc#512:

     and use bsdlabel(8).

     If you have trouble with your driver, your parallel chipset may not run properly at the detected mode (NIBBLE, PS2 or EPP).  Tune the ppc(4)
     bootflags to force other modes.

SEE ALSO

     da(4), lpt(4), ppbus(4), ppc(4), scsi(4)

HISTORY

     The vpo manual page first appeared in FreeBSD 3.0.

AUTHORS

     This manual page was written by Nicolas Souchu.

BUGS

     During boot, the driver first tries to detect a classic ZIP, then a ZIP+.	The ZIP+ detection is intrusive and may send erroneous characters
     to your printer if the drive is not connected to your parallel port.

BSD
								 December 14, 2004							       BSD
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