zfs discuss - Jan 2008 - problem with nfs share of zfs storage

I have a need to stream video over nfs. video is stored on zfs. every 10
minutes or so, the video will freeze, and then 1 minute later it
resumes. This doesn''t happen from an nfs mount on ufs. zfs server is a
32 bit P4 box with 512MB, running nexenta in plain text mode, and
nothing else, really. Tried playback from different OSes and the same is
happening. Network has more than 10x the capacity that is required, no
compression on zfs

Any idea what is going on? cpu is not pegged on server or playback
client. Not sure what to look for.

Hello Francois,

Monday, January 21, 2008, 9:51:22 PM, you wrote:

FD> I have a need to stream video over nfs. video is stored on zfs. every 10
FD> minutes or so, the video will freeze, and then 1 minute later it
FD> resumes. This doesn''t happen from an nfs mount on ufs. zfs
server is a
FD> 32 bit P4 box with 512MB, running nexenta in plain text mode, and
FD> nothing else, really. Tried playback from different OSes and the same is
FD> happening. Network has more than 10x the capacity that is required, no
FD> compression on zfs

FD> Any idea what is going on? cpu is not pegged on server or playback
FD> client. Not sure what to look for.



try to do iostat -xnz 1 while you are streamin and catch the moment
you experience a problem.

Also try vmstat -p 1 at the same time and catch the same moment.



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Best regards,
 Robert                            mailto:milek at task.gda.pl
                                       http://milek.blogspot.com