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1. Linux
I'm trying to performance tune the I/O of my web server, which is at 41.1% reads merged (If my math is correct), which seems a tad high to just be going along with the defaults. Will modifying read_ahead_kb affect the value of "reads merged" in diskstats? If not, what's a good way of tracking... (2 Replies)
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2. AIX
Hi All, Need an urgent help, I have a requirement to find long running unix processes.. I have tried the below commands, but not succeed. I need to arrange the unix processess in an order of elapsed time (high to low) that runs in a system.
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3. Shell Programming and Scripting
Hi
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4. UNIX for Dummies Questions & Answers
I was analyzing the Disk read using hdparm utility.
This is what i got as a result.
# hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 108 MB in 3.04 seconds = 35.51 MB/sec
# hdparm -T /dev/sda
/dev/sda:
Timing cached reads: 3496 MB in 1.99 seconds = 1756.56 MB/sec... (1 Reply)
Discussion started by: pinga123
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5. Shell Programming and Scripting
I have high values (such as ÿÿÿÿ) in a text file contained in an Unix AIX server. I need to identify all the records
which are having these high values and also get the position/column number in the record structure if possible. Is there
any Unix command by which this can be done to :
1.... (5 Replies)
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6. AIX
Hi Guys,
I need to write a script capable of identifying when a high cpu utilitzation process. It sounds simple but we are on a AIX 5.3 environment with Virtual CPU's (VP's) and logical CPU's. Please any ideas or tips would be highly appreciated. Thanks.
Harby. (6 Replies)
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7. Filesystems, Disks and Memory
Hi All
I was wondering how the copying of vast amounts of data affected the overall lifespan of an HDD.
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Is this likely to have a detrimental effect on the disk in terms of reads/writes etc?
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8. Filesystems, Disks and Memory
Hi,
I am trying to find the reliability of 'vmstat -d' for showing the actual physical writes on sectors on hard disk.
Can anyone please tell me if the numbers in the "sectors" field under "read" or "write" headers show a count of the actual write commands sent to disk from the low level... (2 Replies)
Discussion started by: jake24
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9. UNIX for Advanced & Expert Users
Guys,
Is there any UNIX command that captures the 'Unix process which is performing high disk I/O reads and writes'.
can you help me in this?
-Swamy (6 Replies)
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10. Shell Programming and Scripting
Hi everyone,
Ive got a quick question about the feasibility and any suggestions for a shell script. I can use sh or ksh, doesnt matter. Basically, Ive got an output file from a db2 command that looks like so:
SCHEMA NAME CARD LEAF ELEAF LVLS ISIZE NDEL KEYS F4 F5 ... (3 Replies)
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DVHTOOL(8) System Manager's Manual DVHTOOL(8)
NAME
dvhtool - Disk volume header manipulation tool
SYNOPSIS
dvhtool --device devicename [ option ]
dvhtool -d devicename [ option ]
DESCRIPTION
dvhtool is a utility for displaying SGI disk partition and volume header information as well as for copying files to and from the volume
header.
It is similar to the IRIX(tm) utility of the same name, however the options and usage are quite different. Also, the IRIX utility cannot
display partition and boot file information.
The disk volume header includes the disk partition table and the volume directory. The volume directory is an index to the files stored in
the volume header part of the disk. These files can be anything but are usually standalone programs (like sash, the SGI standalone shell).
The space available for files is usually limited to one, two or a few megabytes, this can only be changed by repartitioning the disk with
fx, the SGI disk formatting and partitioning tool or fdisk.
You must be root to invoke dvhtool. The device name can be /dev/sda for the first disk, /dev/sdb for the second, and so on.
dvhtool will also work on a file image of a disk volume header.
OPTIONS -d, --device devicename Specify the volume header device name (or file image)
--print-volume-header
Show volume header data only
--print-volume-directory
Show volume table of contents
--print-partitions
Show partition data
--print-all
Equivalent to all three above options
--vh-remove name
Remove volhdr file name.
--vh-to-unix name file
Copy volhdr file name to Unix file file
--unix-to-vh file name
Copy Unix file file to volhdr as name
--help Show usage information
SEE ALSO
fdisk(8)
IRIX tools: fx(1M), prtvtoc(1M), vh(7M).
AUTHORS
dvhtool was written by Ralf Baechle <ralf@oss.sgi.com>, Keith M. Wesolowski <wesolows@foobazco.org>, Tor Arntsen <tor@spacetec.no>, Guido
Guenther <agx@debian.org>.
4th Berkeley Distribution July 2000 DVHTOOL(8)