Killing processes to free resources is not a good idea. You might shoot something you still need.
Yes, from the look of it you have a severe bottleneck with your 1 hdisk. Is this hdisk a physical disk or a LUN from SAN storage?
Do you use asynchronous I/O (AIO) and have it tuned? Oracle will most probably benefit from it as well as getting additional disks.
nmon/topaz has a page that displays AIO stats, I think it was shift + a, not sure though, easy to try it out anyway.
You could post the output of
(the 1st 2 commands when there is traffic on your box) and use code tags when doing so, thanks.
Hi you all, I have a BIG performance problem on an Sun E3500, the scenario is described below:
I have several users (30) accessing via samba to the E3500 using an application built on Visual Foxpro from their Windows PC , the problem is that the first guy that logs in demands 30% of the E3500... (2 Replies)
Hello,
i have a a1000 connected to an e6500. There's a raid 10 (12 disks) on the a1000.
If i do a
dd if=/dev/zero of=/mnt/1 bs=1024k count=1000
and then look at iostat it tells me there's a kw/s of 25000.
But if i do a
dd of=/dev/zero if=/mnt/1 bs=1024k count=1000
then i see only a... (1 Reply)
Hello,
I'm running a script on AIX to process lines in a file. I need to enclose the second column in quotation marks and write each line to a new file. I've come up with the following:
#!/bin/ksh
filename=$1
exec >> $filename.new
cat $filename | while read LINE
do
echo $LINE | awk... (2 Replies)
Hello all
We just built a storage cluster for our new xenserver farm. Using 3ware 9650SE raid controllers with 8 x 1TB WD sata disks in a raid 5, 256KB stripe size.
While making first performance test on the local storage server using dd (which simulates the read/write access to the disk... (1 Reply)
Hello,
we have a machine with Solaris Express 11, 2 LSI 9211 8i SAS 2 controllers (multipath to disks), multiport backplane, 16 Seagate Cheetah 15K RPM disks.
Each disk has a sequential performance of 220/230 MB/s and in fact if I do a
dd if=/dev/zero of=/dev/rdsk/<diskID_1> bs=1024k... (1 Reply)
Hello guys,
I have two servers performing the same disk operations. I believe one server is having a disk's impending failure however I have no hard evidence to prove it. This is a pair of Netra 210's with 2 drives in a hardware raid mirror (LSI raid controller). While performing intensive... (4 Replies)
Hi
We have an M3000 single physical processor and 8gb of memory running Solaris 10. This system runs two Oracle Databases one on Oracle 9i and One on Oracle 10g.
As soon as the Oracle 10g database starts we see an immediate drop in system performance, for example opening an ssh session can... (6 Replies)
Hi Everyone,
I have been struggling for few days with iSCSI and thought I could get some help on the forum...
fresh install of AIX7.1 TL4 on Power 710, The rootvg relies on 3 SAS disks in RAID 0, 32GB Memory
The lpar Profile is using all of the managed system's resources.
I have connected... (11 Replies)
Just a quick note for macOS users.
I just installed (and removed) Parallels Desktop 15 Edition on my MacPro (2013) with 64GB memory and 12-cores, which is running the latest version of macOS Catalina as of this post. The reason for this install was to test some RIGOL test gear software which... (6 Replies)
Discussion started by: Neo
6 Replies
LEARN ABOUT CENTOS
vfs_aio_linux
VFS_AIO_LINUX(8) System Administration tools VFS_AIO_LINUX(8)NAME
vfs_aio_linux - implement async I/O in Samba vfs using Linux kernel aio calls
SYNOPSIS
vfs objects = aio_linux
DESCRIPTION
This VFS module is part of the samba(7) suite.
The aio_linux VFS module enables asynchronous I/O for Samba on Linux kernels that have the kernel AIO calls available without using the
Posix AIO interface. Posix AIO can suffer from severe limitations. For example, on some Linux versions the real-time signals that it uses
are broken under heavy load. Other systems only allow AIO when special kernel modules are loaded or only allow a certain system-wide amount
of async requests being scheduled. Systems based on glibc (most Linux systems) only allow a single outstanding request per file descriptor
which essentially makes Posix AIO useless on systems using the glibc implementation.
To work around all these limitations, the aio_linux module was written. It uses the Linux kernel AIO interface instead of the internal
Posix AIO interface to allow read and write calls to be processed asynchronously. A queue size of 128 events is used by default. To change
this limit set the "aio num events" parameter below.
Note that the smb.conf parameters aio read size and aio write size must also be set appropriately for this module to be active.
This module MUST be listed last in any module stack as the Samba VFS pread/pwrite interface is not thread-safe. This module makes direct
pread and pwrite system calls and does NOT call the Samba VFS pread and pwrite interfaces.
EXAMPLES
Straight forward use:
[cooldata]
path = /data/ice
aio read size = 1024
aio write size = 1024
vfs objects = aio_linux
OPTIONS
aio_linux:aio num events = INTEGER
Set the maximum size of the event queue that is used to limit outstanding IO requests.
By default this is set to 128.
VERSION
This man page is correct for version 4.0 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
Samba 4.0 06/17/2014 VFS_AIO_LINUX(8)