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тАО09-25-2001 08:15 PM
тАО09-25-2001 08:15 PM
async_config I/O error - device files problem?
we are seeing "Ioctl async_config, errno=1" errors in an Oracle trace file once for every sqlplus session.
In /dev we have two device files with the same minor and major numbers (async and asyncdsk) - is this normal or can it cause problems? - both are 101 0x0.
There is apparently a fix for this using 'setprivgrp' but I need to assure myself that the device files are not linked to this problem.
All help/advice appreciated.
Regards,
PK
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тАО09-25-2001 09:31 PM
тАО09-25-2001 09:31 PM
Re: async_config I/O error - device files problem?
In our server it is like this.
crw-r--r-- 1 root sys 101 0x000001 Jan 27 2000 async
crw-rw-rw- 1 bin bin 101 0x000000 Jan 26 2000 asyncdsk
They are not same
Regards
Animesh
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тАО09-26-2001 12:47 AM
тАО09-26-2001 12:47 AM
Re: async_config I/O error - device files problem?
Are you using raw logical volumes?If you are using raw logical volumes , consider implementing asynchronous IO.
The difference between the async i/o and the synchronous i/o is that async does
not wait for confirmation of the write before moving on to the next task. This
does increase the speed of the disk performance at the expense of robustness.
Synchronous I/O waits for acknowledgement of the write (or fail) before
continuing on. The write can have physically taken place or could be in the
buffer cache but in either case, acknowledgement has been sent. In the case of
async, no waiting.
To implement asynchronous IO on HP-UX
* add the asyncdisk Driver (Asynchronous Disk Pseudo Driver)
to the HP-UX Kernel (using SAM),
* create the device file:
# mknod /dev/async c 101 0x00000#
#=the minor number can be one of the following values:
0x000000 default
0x000001 enable immediate reporting
0x000002 flush the CPU cache after reads
0x000004 allow disks to timeout
0x000005 is a combination of 1 and 4
0x000007 is a combination of 1, 2 and 4
Note: Contact your database vendor or product vendor to determine the
correct minor number for your application.
Hope this helps
Animesh
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тАО09-26-2001 02:06 AM
тАО09-26-2001 02:06 AM
Re: async_config I/O error - device files problem?
Create /etc/privgrp
MLOCK dba
run setprivgrp.
See /sbin/init.d/setpr* for correct filename.
See oracle docs also.
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тАО01-18-2007 05:37 AM
тАО01-18-2007 05:37 AM
Re: async_config I/O error - device files problem?
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тАО01-18-2007 10:06 AM
тАО01-18-2007 10:06 AM