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 see RX-DRP value is high. Can I assume that this is (also) playing role in it ? What else can I check ? Any pointer ?
if your mount options *(tcp/udp-rsize/wsize-nfs/cifs and vers and the other opt) and nic settings are same on the both of them server
then we may check the rx/tx (eg.number of packets which hold by driver) buffer queue sizes.because of there is seem drops in the rx buffer.
if any operations needs high traffic we can increase the driver buffers.
we are facing the slow read operations so you likely pointed the correct value.
check the your (vm) nic card driver and search for , is there a bug or update or patches and then apply it.
Code:
# ethtool -i eth0
check the current ring buffer settings.
Code:
# ethtool -g eth0
and try to increase the rx value to defined maximum values.(eg..256/512/1024)
Code:
# ethtool -G eth0 rx 512
and test again and check the drops count.
if there is no change after dd tests then you can try to change the virtual nic to avaliable other one in the oracle vm net settings.
Something to check before delving into this too deeply is that the networking is set up properly, if you are running through any intelligent network infrastructure ensure that all the TX/RX settings are the same.
Points worth looking at are is auto negotiate set anywhere. Are the port parameters the same all the way through I.E. 100Mb Full Duplex etc.
Hello All,
I am building a real time parser for a log file in my application.
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Heyas
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One of my mate is suggesting to create a file using dd command and check how much time it takes to create a 30 gb file .
I think this has a little sense however i would also like to take your reviews... (5 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
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Hi,
Currently I have a Samba shared configured as follows:
comment = Public fileshare
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guest ok = Yes
writeable = Yes
There is a subfolder under /u02/pub called /u02/pub/expenses/hardware that I need to make read only. How do I do this? I am new to using Samba.
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Hallo,
i need a Prompting read in my script:
read -p "Enter your command: " command
But i always get this Error:
-p: is not an identifier
When I run these in c-shell i get this error
/usr/bin/read: read: bad option(s)
How can I use a Prompt in the read command? (9 Replies)
11-04-2014
