disk performance Post: 302483866

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1. Filesystems, Disks and Memory

optimizing disk performance

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...

2. AIX

disk performance

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...

3. AIX

AIX 5.2 5.3 disk performance exerciser tool

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...

4. Red Hat

Linux disk performance

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...

5. Red Hat

Disk performance problem on login

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...

6. Solaris

Hard disk write performance very slow

Dear All, I have a hard disk in solaris on which the write performanc is too slow. The CPU , RAM memory are absolutely fine. What might be reason. Kindly explain. Rj

7. Solaris

Poor Disk performance on ZFS

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...

8. Solaris

Poor disk performance however no sign of failure

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...

9. Linux

Disk Performance

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...

LEARN ABOUT SUNOS

dtrace

dtrace(7D)							      Devices								dtrace(7D)

NAME

       dtrace - DTrace dynamic tracing facility

DESCRIPTION

       The  dtrace  driver  provides  the  dynamic  instrumentation and tracing facilities for the DTrace software, as well as the built-in dtrace
       provider. The dtrace driver is not a public interface and you access the instrumentation offered by this provider through DTrace tools such
       as  dtrace(1M).	 Refer to the Solaris Dynamic Tracing Guide for a description of the public documented interfaces available for the DTrace
       facility and dtrace provider probes.

ATTRIBUTES

       See attributes(5) for a description of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWdtrp			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Private			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       dtrace(1M), libdtrace(3LIB), attributes(5)

       Solaris Dynamic Tracing Guide

SunOS 5.10							    4 Sep 2003								dtrace(7D)