10 More Discussions You Might Find Interesting
1. Linux
I have a freshly installed Oracle Linux 7.1 ( akin to RHEL ) server.
However after installing some Oracle software, I have noticed that my hard disk light is continually on and the system performance is slow.
So I check out SAR and IOSTAT
lab3:/root>iostat
Linux... (2 Replies)
Discussion started by: jimthompson
2 Replies
2. UNIX for Dummies Questions & Answers
In a SCO Unix shop, I am working on the following script to move any file to its same location on the target machine (called 'othersy' here):
pwd=`pwd`
for i in "$@"
do
echo " $i "
if ; then echo 1; else echo 0; fi
rcp -p $i othersy:$pwd/$i
echo "Finished with ^ If I find a file... (4 Replies)
Discussion started by: wbport
4 Replies
3. Solaris
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)
Discussion started by: golemico
1 Replies
4. Solaris
What tools/utilities do you use to generate metrics on disk i/o throughput on Solaris. For example, if I want to see the i/o rate of random or sequential r/w. (2 Replies)
Discussion started by: dangral
2 Replies
5. Red Hat
Running CentOS 5.5:
I've come across a relatively recent problem, where in the last 2 months or so, the root disk goes to 99% utilization for about 20 seconds when a user logs in. This occurs whether a user logs in locally or via ssh. I have tried using lsof to track down the process that is... (5 Replies)
Discussion started by: dangral
5 Replies
6. Red Hat
I am getting absolutely dreadful iowait stats on my disks when I am trying to install some applications.
I have 2 physical disks on which I have created 2 separate logical volume groups and a logical volume in each. I have dumped some stats as below
My dual core CPU is not being over utilised... (3 Replies)
Discussion started by: jimthompson
3 Replies
7. AIX
I'm search for a disk exerciser / load tool like iometer, iozone, diskx for IBM AIX 5.2 and 5.3
Because of a very bad disk performance on several AIX systems, I need to have a tool which is able to generate a disk load on my local and SAN disks.
Does somebody knows a kind of tool which is... (5 Replies)
Discussion started by: funsje
5 Replies
8. AIX
Hello,
I have a aix 570 system with san disk. I do write test of performance
in a lv with four disk. While the test I run filemon tools for trace
the disk activity. The outputs of filemon are at the en of this message. I
see my lV(logical volume) throughput at 100 meg by second. 2 of 4
disk... (0 Replies)
Discussion started by: Hugues
0 Replies
9. AIX
Can I change any AIX System paramerter for speeding the data Disk performance?
Currently it slows with writing operations. (1 Reply)
Discussion started by: gogogo
1 Replies
10. Filesystems, Disks and Memory
I have some questions regarding disk perfomance, and what I can do to make it just a little (or much :)) more faster.
From what I've heard the first partitions will be faster than the later ones because tracks at the outer edges of a hard drive platter simply moves faster. But I've also read in... (4 Replies)
Discussion started by: J.P
4 Replies
pfto(7) Miscellaneous Information Manual pfto(7)
NAME
pfto - Powerfail Timeout
DESCRIPTION
HP-UX SCSI disk device drivers have a timeout facility that detects non-responding disks. VxVM uses this mechanism in its Powerfail Time-
out (pfto) feature. You can specify a timeout value for individual VxVM disks using the vxdisk command (see the EXAMPLES section below).
If a disk fails to respond in the specified timeout period, the driver receives a timer interrupt.
pfto values are persistent across reboots, that is, after the pfto value is set, it remains in effect until you explicitly change it. If
dynamic multipathing is enabled, the pfto value set on a disk applies to each path of a multipath disk device.
The pfto value is in seconds. If pfto is not specified, or is zero, the timeout period is 30 seconds. Both the vxdisk and vxprint commands
display the current pfto value for a disk.
EXAMPLES
Use the following command to set the value of pfto to 30 seconds on disk01:
vxdisk -g rootdg set disk01 pfto=30
Use either of the following commands to display the pfto value on the VxVM disk disk01:
vxdisk list disk01
vxprint -l disk01
EXIT CODES
Setting the pfto value on a non-VxVM disk returns an error.
SEE ALSO
vxdisk(1M), vxprint(1M)
VxVM 5.0.31.1 24 Mar 2008 pfto(7)