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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.
For Eg:
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3. Shell Programming and Scripting
Hi
I am looking for an easy way to lock game mode (0) for everyone included op on a Minecraft server. It can be a script that every time a player changes game to 1 the script changes back to 0. What the player writes is visible in the java console. I am not good at script programming and my... (0 Replies)
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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
1 Replies
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)
Discussion started by: devina
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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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hdik(8) BSD System Manager's Manual hdik(8)
NAME
hdik -- lightweight tool to attach and mount disk images in-kernel
SYNOPSIS
hdik imagefile [options]
DESCRIPTION
hdik is a lightweight tool that can be used to attach disk images in-kernel (i.e. without a user-land process to provide the backing store).
Only a subset of disk images can be mounted in this manner including read/write disk images, UDIF disk images that use zlib compression,
shadowed disk images, and sparse disk images.
hdik is intended for use in situations where linking against the DiskImages framework is problematic or an extremely lightweight mechanism
for attaching a disk image is needed.
You can specify that the image should not be processed by Disk Arbitration by specifying the -nomount option. You can also specify that the
image be mounted with a shadow file by using the -shadow option.
The following argument must be specified:
imagefile the disk image to be mounted.
OPTIONS
-shadow [shadowfile]
Use a shadow file in conjunction with the data in the image. This option prevents modification of the original image and allows
read-only images to be used as read/write images. When blocks are being read from the image, blocks present in the shadow file
override blocks in the base image. When blocks are being written, the writes will be redirected to the shadow file. If not
specified, -shadow defaults to <imagename>.shadow. If the shadow file does not exist, it is created.
-nomount Suppress automatic mounting of the image or partitions on it. This will result in /dev entries being created, but will not mount
any volumes.
-drivekey keyname=value
Specify a key/value pair for the IOHDIXHDDrive object created (shows up in the IOKit registry of devices which is viewable with
ioreg(8)).
SEE ALSO
hdiutil(1), diskarbitrationd(8), diskutil(8), ioreg(8)
Mac OS X 29 Apr 2003 Mac OS X