Known Issues

SMB/CIFS is slow on macOS

The default network settings are not optimized in macOS. Make the following changes as root to increase the performance on a Mac:

sysctl -w net.inet.tcp.delayed_ack=0
sysctl -w net.inet.tcp.mssdflt=1440
sysctl -w net.inet.tcp.sendspace=250000
sysctl -w net.inet.tcp.recvspace=250000

echo 'net.inet.tcp.delayed_ack=0' >> /private/etc/sysctl.conf
echo 'net.inet.tcp.mssdflt=1440' >> /private/etc/sysctl.conf
echo 'net.inet.tcp.sendspace=250000' >> /private/etc/sysctl.conf
echo 'net.inet.tcp.recvspace=250000' >> /private/etc/sysctl.conf

Cannot map SMB/CIFS shares from same server with different users

On Windows you cannot access shares from the same host using more than one user concurrently. This is a limitation of the SMB client implementation in Windows.

A workaround is to use either an alternative host name of the server or its raw IP address for the server part of the share URI. For example:

  • //fs.www.inf.ethz.ch/<share>
  • //fs-www.inf.ethz.ch/<share>
  • //129.132.19.20/<share>

Page URL: https://isg.inf.ethz.ch/bin/view/Main/HelpStorageKnownIssues
2019-09-18
© 2019 Eidgenössische Technische Hochschule Zürich