FAQs// Compatibility / Troubleshooting / HA Cluster / Howto

Increasing the disk timeout values under Linux

euroNAS HA Cluster provides you the highest level of redundancy. It even protects you if one of the replication servers fail. In this case all ressources will be moved to another running server automatically.

During failover the ressources are unavailable during the failover period. In most cases OS can handle this but sometimes it is nessesary to change default timeout settings.

When connecting to Linux using iSCSI timings depend on 2 factors:

  • Timeout of the disk and
  • of the open-iscsi initiator.

You can see the current time out values of your iSCSI disk with following command:
find /sys/class/scsi_generic/*/device/timeout -exec grep -H . '{}' \;

Value can be changed by editing timeout settings in /sys – for example:
echo 180 > /sys/block/sdd/device/timeout

This setting is not remaining after reboot so putting it into a start script is recommended.