Sharing DVD over NFS - performance question

Hi,
I'm trying to share the DVD over NFS.
I have updated /etc/rmmount.conf with the following line:
share cdrom* -o ro,anon=0Everything works well, except the reading speed, which is quite slow.
Copying a ~200MB file from DVD over NFS takes ~12 minutes.
Copying the same file from DVD to the local filesystem takes ~2 minutes,
and copying this file from the hard drive over NFS takes ~20 seconds.
This makes me believe that the issue is in the interworking of the NFS and DVD-ROM, for (hypothetical) example,
the disk can not spin up to the max speed due to the random access.
Has anyone tried sharing the DVDs with good performance? Should I read up and tweak some NFS parameters or abandon the idea of achieving good performance?
I'm using Solaris 10 Update 7.
Thanks in advance for any suggestions.

Thanks for the suggestion.
I'm not sure if it's applicable for my issue. From what I've read, it may help if the same data is read over and over,
but not with the reading speed of just inserted DVD disks which are not yet cached (which is the usage pattern I'm trying to optimize for).

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Have you filed a bug report with Apple?
http://developer.apple.com/bugreporter/
If not, there's less of a chance they'll know about it and help fix it for you.
Do things look OK from the command line in Terminal?
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I have 2 questions about NFS on 10.4.
Client;
Has NFS performance improved on the client side? Last time I tested was 10.3, and the sustained throughput was about 10-12 MB/s on a gig connection. This was from a Sun NFS server.
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The client is somewhat lacking.
On one test here (XServe G5 client talking to XServe RAID 5 array connected to XServe G5 NFS server) I get around 40MB/sec copying a file to the RAID over a gigabit ethernet network.
By comparison, a Solaris machine talking to the same server gets almost 80MB/sec.
So it sounds like it's improved some from when you last tested, but maybe not by as much as you'd like.
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Hope someone can help me sort out this problem.
Dear Support.
We are having a Solaris/Sparc file server running Solaris 10. The Solaris machine act as a NFS file server. We encounter very poor NFS performance when copying files to and from a filesystem via Linux NFS
I have set up a very simple test scenario. Created a tar file, size around 3 GB. The file is sitting on a SAN system. The file it self is created on a Solaris 10 UFS filesystem.
Solaris E240 Solaris 8 NFS, GB interface copy to and from the same disk via NFS
timecp /seis/seis600_new/usr.tar /seis/seis600_new/new1.tar
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user 0m0.11s
sys 0m29.72s
IBM/AMD 64 bit Linux WS3 U5, GB interface NFS to and from the same disk via NFS.
time cp /seis/seis600_new/usr.tar /seis/seis600_new/new1.tar
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sys 0m21.860s
Also run the test on other Linux boxes with similar results?
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Let me wrap up.
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Not always bad performance when using NFS between Solaris server and clients.

It's been a while since I was doing linux->solaris nfs, so bear with me as I clear out the cobwebs.
First things to check: Mount options for the nfs mount to the server.
Which versions of nfs are you using?(v2, v3?) Solaris uses version 3 mounts by default.
What's your wsize and rsize for reads and writes?
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nfsv3 has a number of performance enhancements over v2, so give that a shot with a larger block size.
nfsvers=3,wsize=8192,rsize=8192,nolock,intr
Also experiment with your locking options, that might help some.
NFS has always been a fairly weak point for linux.
A few links for reference:
http://www.scd.ucar.edu/hps/TECH/LINUX/linux.html
http://nfs.sourceforge.net/
Cheers && good luck,
fptt.

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TidyCup
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With fully functional ZFS expected in Snow Leopard Server, I thought I'd do some performance testing using a few different zpool configurations and post the results.
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Network:
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In the Shares configuration:
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Ierrs on 3C905B over NFS on solaris 8 x86

I have 2 identical Dell PC's, one with Solaris 8 HW 07/01 and one with Solaris 2.6
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Name Mtu Net/Dest Address Ipkts Ierrs Opkts Oerrs Collis Queue
lo0 8232 127.0.0.0 127.0.0.1 103 0 103 0 0 0
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elxl0 1500 172.17.8.0 172.17.8.121 22768 4457 1995 0 0 0
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opackets 2557 ipackets 30038 oerrors 0 ierrors 6016 collisions 0
obytes 456750 rbytes 38685177 multixmt 0 multircv 79 brdcstxmt 10 brdcstrcv 3108
unknowns 1908 blocked 0 ex_collisions 0 defer_xmts 77 align_errors 0
fcs_errors 0 oflo 6012 uflo 0 runt_errors 0 missed 0 tx_late_collisions 0
carrier_errors 1 noxmtbuf 0 norcvbuf 0 xmt_badinterp 0 rcv_badinterp 0
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rbytes64 38685177 ifspeed 100000000 duplex half media PHY/MII promisc off first_collisions 0
multi_collisions 0 sqe_errors 0 macxmt_errors 0 toolong_errors 0
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Hi Ithieme,
Try with other media. This issue may be your media problem.
Revert back.
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Simple performance question

Simple performance question. the simplest way possible, assume
I have a int[][][][][] matrix, and a boolean add. The array is several dimensions long.
When add is true, I must add a constant value to each element in the array.
When add is false, I must subtract a constant value to each element in the array.
Assume this is very hot code, i.e. it is called very often. How expensive is the condition checking? I present the two scenarios.
private void process(){
for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
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for (int ii=0;ii<dimension1;ii++)
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for (int i=0;i<dimension1;i++)
for (int ii=0;ii<dimension1;ii++)
for (int iii=0;iii<dimension1;iii++)
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}Is the second scenario worth a significant performance boost? Without understanding how the compilers generates executable code, it seems that in the first case, n^d conditions are checked, whereas in the second, only 1. It is however, less elegant, but I am willing to do it for a significant improvement.

erjoalgo wrote:
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Hi,
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http://help.sap.com/saphelp_nw04/helpdata/en/43/d92e428819da2ce10000000a1550b0/content.htm
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/xi/3.0/sap%20exchange%20infrastructure%20tuning%20guide%20xi%203.0.pdf
BPM Performance tuning
BPM Performance issue
BPM performance question
BPM performance- data aggregation persistance
Regards
Chilla..

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danielfromlaurel wrote:
I get the statement "streaming on this device is not supported on your plan". My plan includes 'unlimited streaming' using the IPAD2 app.
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Sharing DVD over NFS - performance question

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