Home > Storage > PowerStore > Data Protection > Dell PowerStore: Metro Volume > Requirements and installation
The witness is distributed as an installable RPM package which can be deployed on a virtual or physical system running a supported version of Linux. See the Dell PowerStore Simple Support Matrix on Dell.com/powerstoredocs for a list of supported Linux hosts. The package may be installed using RPM-Tool if required dependencies have already been met (mainly Java and SQLite), or a package management utility (such as yum or zypper) which will resolve all required dependencies.
Note: TCP ports 22 and 443 must be open for remote SSH login and https witness communication respectively. In addition, the witness time must be synchronized with the time on PowerStore. Time synchronization can be automated using NTP or PTP configuration for the witness operating system and NTP configuration in PowerStore manager.