Off Topic - Anyone here using Isilon storage with Yosemite?

For 10.7 through 10.9, I made available a Self Service item that adjusted the TCPDelayAck to 2. Apple normally set it to 3. I believe the solution was discussed in JAMFNation and even a document from Isilon suggested the change. This covered the issue with performance and was well liked by our users. I even included a Self Server to revert back to the default, but no one ever selected that.

I don't have it scoped to 10.10 devices because no one has mentioned performance issues with 10.10, except... Soon after I read your post, I got an email that we might have a new issue. They didn't provide any specifics. I will begin collecting info from the users tomorrow.

#!/bin/sh

################################################################################
#
#  This script sets the TCP delay ack to 2, as recommended by Isilon to help improve the
#  performance of browsing, saving, and reading from network file shares.
#
#  REFERENCES
#  PDF document:  Using Mac OS X Clients with Isilon OneFS 6.5 (Oct 2012)
#  http://hints.macworld.com/article.php?story=20051107090652912
#  JAMFNation
#  
#################################################################################

##########################################################################################
# Create time date stamped log to record actions taken by this script.
##########################################################################################
logFile="/private/var/log/IT.log"

log () {
    /bin/echo $1
    /bin/echo $(date "+%Y-%m-%d %H:%M:%S: ") $1 >> $logFile 
}

log ""
log "BEGIN changing the TCP Delayed Acknowledgment to 2 for better performance"

##########################################################################################
#  STEP 1
#    The following line set the delay for the current user logged in and works 
#    immediately, but reverts back to 3 (auto) after a reboot.
sudo sysctl -w net.inet.tcp.delayed_ack=2
log "Changed the users sysctl to tcp delay ack 2"

##########################################################################################
#  STEP 2
#    Clear any previous sysctl.conf file
if [ -f "/private/etc/sysctl.conf" ]; then
    log "Deleted the existing sysctl.conf file " 
    /bin/rm -f "/private/etc/sysctl.conf"
fi

#    Set the delay to 2 so that it remains after a reboot
sudo bash -c "echo 'net.inet.tcp.delayed_ack=2' >> /etc/sysctl.conf"
log "Changed the etc/syctl.conf to tcp delay ack 2"


log "COMPLETED changed the TCP Delayed Acknowledgment to 2."

exit 0

Any links to where this was discussed at JAMF Nation? We're having file saving and locking issues on our Isilon based storage with 10.10.x clients & Office apps. EMC have looked at some packet captures and are pointing the finger at Microsoft Office. Have you tried this TCP change on Yosemite?

Thanks,
Matt