That will be inaccurate because of cache... stuff written to disk just gets shoved into memory until the disk's ready. 30 gigs would probably fill the cache, but still, there's better ways that don't involve waiting for 30 gigs of data to be written.
Linux usually has the hdparm command. It has read tests that take just a few seconds:
There's no equivalent write-speed test but, for a traditional hard disk, read speed and write speed should be about the same.
If a file size increases in Linux/UNIX to say in GB's then will there be a decrease in write speed.
I mean will it take more time to write to a large file then to a small one??
Please clarify?
Thanks in advance (2 Replies)
I analysed disk performance with blktrace and get some data:
read:
8,3 4 2141 2.882115217 3342 Q R 195732187 + 32
8,3 4 2142 2.882116411 3342 G R 195732187 + 32
8,3 4 2144 2.882117647 3342 I R 195732187 + 32
8,3 4 2145 ... (1 Reply)
Hi,
We have smb client running on two of the linux boxes and smb server on another linux system. During a backup operation which uses smb, read of a file was allowed while write to the same file was going on.Also simultaneous writes to the same file were allowed.Following are the settings in the... (1 Reply)
Would simply like to write data (no audio) to a CD/RW disk. The disk drive states CD/RW on the front but don't know for sure if the software is configured to recognize it as a writable disk. I can read/move data from the disk to the hard drive with no issue from the disk. Any help in this... (4 Replies)
I am now on Kernel 2.6.32-26
For me 16x CD write speed is okay.
I have old hardware which was able to write DVDs at 1x, back in previous linux version.
Now, I dont get speed of less than 4x.
Tested on k3b, xfburn, and brasero. But all start at bottom 4x write speed. k3b forced back to... (0 Replies)
Hi,
I went to a computer store and the salesman sold me a SATA cable and told me that all SATA cables are the same. Another salesman at a different store told me a cable rated for SATA 2, which I bought, MIGHT work as well as one rate for SATA 3 but it is not guaranteed. I decided to run a... (3 Replies)
hi all:
as we know , when usb flash disk plug in and aotu mounted , the default permission of the usb flash disk is 700. that means others have no permission . the question: how to make others have read/write permission when the aotu mounted usb flash disk pluge in ? thanks !! (0 Replies)
Hi,
We have two servers in scenario (vmsoldot01 is Oracle VM with Linux and tldtppod15 is physical Linux server). One NAS share is mounted on both servers with similar permissions and access. But READ speed is too bad on virtual in comparison to physical server.
While trying to diagnose this, I... (2 Replies)
Hello All,
I am building a real time parser for a log file in my application.
The log file is continuously written at a very fast pace and gets rolled over every 10 minutes.
I have measured the speed and observed that around 1000 lines are written to it every second, each line about 30-40... (7 Replies)
Discussion started by: cool.aquarian
7 Replies
LEARN ABOUT DEBIAN
ioping
IOPING(1) User Commands IOPING(1)NAME
ioping - simple disk I/O latency monitoring tool
SYNOPSYS
ioping [-LCDRq] [-c count] [-w deadline] [-p period] [-i interval] [-s size] [-S wsize] [-o offset] device|file|directory
ioping -h | -v
DESCRIPTION
This tool lets you monitor I/O latency in real time.
OPTIONS -c count
Stop after count requests.
-w deadline
Stop after deadline time passed.
-p period
Print raw statistics for every period requests.
-i interval
Set time between requests to interval (1s).
-s size
Request size (4k).
-S size
Working set size (1m).
-o offset
Offset in input file.
-L Use sequential operations rather than random. This also sets request size to 256k (as in -s 256k).
-C Use cached I/O.
-D Use direct I/O.
-R Disk seek rate test (same as -q -i 0 -w 3 -S 64m).
-q Suppress human-readable output.
-h Display help message and exit.
-v Display version and exit.
Argument suffixes
For options that expect time argument (-i and -w), default is seconds, unless you specify one of the following suffixes (case-insensitive):
us, usec
microseconds
ms, msec
milliseconds
s, sec seconds
m, min minutes
h, hour
hours
For options that expect "size" argument (-s, -S and -o), default is bytes, unless you specify one of the following suffixes (case-insensi-
tive):
s disk sectors (a sector is always 512).
k, kb kilobytes
p memory pages (a page is always 4K).
m, mb megabytes
g, gb gigabytes
t, tb terabytes
For options that expect "number" argument (-p and -c) you can optionally specify one of the following suffixes (case-insensitive):
k kilo (thousands, 1 000)
m mega (millions, 1 000 000)
g giga (billions, 1 000 000 000)
t tera (trillions, 1 000 000 000 000)
EXIT STATUS
Returns 0 upon success. The following error codes are defined:
1 Invalid usage (error in arguments).
2 Error during preparation stage.
3 Error during runtime.
EXAMPLES
ioping .
Show disk I/O latency using the default values and the current directory, until interrupted.
ioping -c 10 -s 1M /tmp
Measure latency on /tmp using 10 requests of 1 megabyte each.
ioping -R /dev/sda
Measure disk seek rate.
ioping -RL /dev/sda
Measure disk sequential speed.
SEE ALSO
Homepage <http://code.google.com/p/ioping/>.
AUTHORS
This program was written by Konstantin Khlebnikov <koct9i@gmail.com>.
Man-page was written by Kir Kolyshkin <kir@openvz.org>.
July 2011 IOPING(1)