The immortal aioserver Post: 302958331

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Operating Systems AIX The immortal aioserver Post 302958331 by bakunin on Wednesday 21st of October 2015 10:29:56 AM

10-21-2015

Registered User

Quote:

Originally Posted by agent.kgb

if you want to see them dead, try to change some parameters in the system ;-)

While this is very true - in fact, the "aio" stands for "Asynchronous I/O" and the processes are controlled by tuning parameters - it is most probably a bad idea to do so on a database system. If memory serves correctly Oracle always requested to have asynchronous I/o switched on during the installation and the performance of the db-writer process greatly suffered when it was switched off.

Anyways, the "aioserver" processes are definitely not reponsible for preventing the unmount of the filesystems, so it won't have any positive effect even if it succeeds (although this, given that they are kernel processes is highly unlikely).

The number, btw., of the main processes is dependent on the number of LCPUs the system has. I suppose your system has 8 CPUs configured and this is why you always see a minimum of 8 processes running.

I hope this helps understanding these processes.

bakunin

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LEARN ABOUT V7

umount.nfs

UMOUNT.NFS(8)						      System Manager's Manual						     UMOUNT.NFS(8)

NAME

       umount.nfs, umount.nfs4 - unmount a Network File System

SYNOPSIS

       umount.nfs dir [-fvnrlh ]

DESCRIPTION

       umount.nfs and umount.nfs4 are a part of nfs(5) utilities package, which provides NFS client functionality.

       umount.nfs4  and  umount.nfs are meant to be used by the umount(8) command for unmounting NFS shares. This subcommand, however, can also be
       used as a standalone command with limited functionality.

       dir is the directory on which the file system is mounted.

OPTIONS

       -f     Force unmount the file system in case of unreachable NFS system.

       -v     Be verbose.

       -n     Do not update /etc/mtab.	By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip delet-
	      ing an entry.

       -r     In case unmounting fails, try to mount read-only.

       -l     Lazy unmount. Detach the file system from the file system hierarchy now, and cleanup all references to the file system as soon as it
	      is not busy anymore.

       -h     Print help message.

NOTE

       For further information please refer nfs(5) and umount(8) manual pages.

FILES

       /etc/fstab	 file system table

       /etc/mtab	 table of mounted file systems

SEE ALSO

       nfs(5), umount(8),

AUTHOR

       Amit Gud <agud@redhat.com>

								    6 Jun 2006							     UMOUNT.NFS(8)