ssa performances

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

File alignment and performances... (difficult)

Hello ! I will use my best english possible to explain my objective. I'm french so pardon for the lack of precision... So, what i would like to do in shell script (but you will possibly answer ''not possible in script'' have to use low level langage or something like that) is described below....

2. Solaris

Performances with RAID 5

Hello every body, Maybe someone could help me. I have a SUN Server with 6 disks, each of 150 Gb. I have mounted the first two disk in mirror (RAID1) for the system files. I have mounted 3 disks in RAID5 for users file systems. I kept the last one as spare and I have mounted it standalone...

3. Linux

grep -f CPU performances

Hi I would like to thank you all for this excellent forum. Today i tried to compare two files and i get some problem with it. I have two files and i want to get all the data that match the first file like this File1 (pattern file) ___________________________ 9007 9126 9918 9127 ...

4. AIX

Removing Faulty Disk SSA

Hi Experts, I have configured A D40 Array. There is an faulty disk which is not part of an raid volume but shows fault in the diagnostics. pdisk15 U0.1-P1-I1/Q1-W40AA83CC2400D SSA160 Physical Disk Drive ( MB) Is there a way to stop this...

5. AIX

Procedure for removing SSA array

Hi All, What's the proper procedure for removing SSA arrays? Is the procedure like these? - rmdev ssa disk - physical turn off the ssa - cfgmgr There's no more filesystem or logical volume on it. It's just pdisk and hdisk. Thanks in advance, itik

6. AIX

mirroring ssa to san

Hi guys, I'd like to share my migration/mirroring of ssa to san. No downtime for users, probably I/O performance. here's the step: 1 After the lun had been carved on the SAN and the connections had been done on AIX fiber card 2 “lspv” and look for the new SAN hdisk? on the bottom, say...

7. AIX

migrate from ssa to san

Hi, Do you have procedures to migrate ssa disks to san disk? I don't have testing environment and I want my file system be migrated one at a time. I want it to be fast, I have only 15-20 hours to do it on every sunday 1PM till monday 7am. My largest file system is about 150G. The AIX is...

8. AIX

Problem with a SSA drive

I've a problem with an IBM StorageWorks - Seagate SSA drive, model ST373453LC (IBM P/N 24P3733, Type S53D073, 72,8 GB 15K - USCSI 4 - 320 SSA). I bought this disk used but working; it came from an unknown IBM SSA storage array. I've removed the SCA - SSA adapter (IBM 18P3051 - 001 - R0) and i tried...

9. AIX

updating ssa

I am in the process of updating ssa adapters, drives and enclosures and wanted to know if there are any caveats that anyone would like to share. The documentation is not very clear on the ordering of the updates. Any tips would be appreciated.

10. AIX

RS6000 SSA Raid question

Hi Can I add disks on the fly to extend the capacity of an existing RAID 5 volume? It's created on a 4P Advanced SSA Raid Adapter. I need to extend a volume group, so I figured it would be easiest to extend the "physical disk" which is a RAID5 volume. Thanks.

LEARN ABOUT ULTRIX

iostat

iostat(1) General Commands Manual iostat(1)

Name
iostat - report I/O statistics

Syntax
iostat [ -c ] [ -t ] [ disknames ] [ interval ] [ count ]

Description
The command reports I/O statistics for terminals, disks and cpus. For terminals the number of input and output characters are counted.
For disks the number of 512 byte blocks per second and number of transfers per second are displayed. For cpus, it provides the percentage
of time the system has spent in user mode, in user mode running low priority (niced) processes, in system mode, and idling. On multipro-
cessor systems these cpu statistics represent a cumulative summary of all the cpus.

The optional disknames argument causes disk statistics to be displayed for the specified disks. If this argument is not specified then
disk statistics will be displayed for the first 3 disks only.

The optional interval argument causes to report once each interval seconds. The first report is for all time since a reboot and each sub-
sequent report is for the last interval only.

The optional count argument restricts the number of reports.

Options
-c Displays the percentage of time each cpu spent in user mode, running low priority (nice'd) processes, in system mode, and idling.

-t Displays the number of characters read from and written to terminals.

Examples
This example will cause cpu and disk statistics for the 5 disks ra0, ra1, ra2, ra3, and ra4.
iostat ra0 ra1 ra2 ra3 ra4
This example will cause cpu, terminal, and disk statistics for ra0 to be displayed and updated every 2 seconds.
iostat -t ra0 2

Files
See Also
vmstat(1), cpustat(1)

iostat(1)

AIX