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Full Discussion: DB2 high CPU
Operating Systems AIX DB2 high CPU Post 302445555 by zaxxon on Monday 16th of August 2010 08:41:23 AM
Old 08-16-2010
Code:
54484 client filesystem I/Os blocked with no fsbuf

This is not pretty and could be tried to be tuned.

You can try:
Code:
ioo -p -o j2_dynamicBufferPreallocation=32

Default is 16. This is dynamic so remount is needed. If the counter still increases rather quick, you can do additionally:

Code:
ioo -p -o j2_nBufferPerPagerDevice=1024

Default is 512; you can also start with 2048. For this one you will have to remount the filesystems.

It could be that you do not notice this in terms of performance when using the application on top.
 

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LEARN ABOUT HPUX

systemd-remount-fs.service

SYSTEMD-REMOUNT-FS.SERVICE(8)				    systemd-remount-fs.service				     SYSTEMD-REMOUNT-FS.SERVICE(8)

NAME

       systemd-remount-fs.service, systemd-remount-fs - Remount root and kernel file systems

SYNOPSIS

       systemd-remount-fs.service

       /lib/systemd/systemd-remount-fs

DESCRIPTION

       systemd-remount-fs.service is an early boot service that applies mount options listed in fstab(5) to the root file system, the /usr file
       system, and the kernel API file systems. This is required so that the mount options of these file systems -- which are pre-mounted by the
       kernel, the initial RAM disk, container environments or system manager code -- are updated to those listed in /etc/fstab. This service
       ignores normal file systems and only changes the root file system (i.e.	/), /usr and the virtual kernel API file systems such as /proc,
       /sys or /dev. This service executes no operation if /etc/fstab does not exist or lists no entries for the mentioned file systems.

       For a longer discussion of kernel API file systems see API File Systems[1].

SEE ALSO

       systemd(1), fstab(5), mount(8)

NOTES

	1. API File Systems
	   https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems

systemd 237													     SYSTEMD-REMOUNT-FS.SERVICE(8)
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