Dell EMC Unity: Writing to /tmp on Unity system will cause an SP Reboot if /tmp becomes full
Summary:Writing to /tmp on Unity system will cause an SP Reboot if /tmp becomes full. For Unity, /tmp is only 56M in size.
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ISSUE Writing to /tmp on Unity system will cause an SP Reboot if /tmp becomes full. In Dell EMC Unity, /tmp is only 56M in size. So saving / copying / moving files to /tmp is not recommended.
CAUSE This is working as designed. In Unity, the /tmp file system is only used by the system for generating temporary status files which HA (for example) picks up to determine if the system is up. If /tmp is full, these status files cannot be created, and HA determines that the system may be in a bad state. It then initiates a graceful reboot in an attempt to resolve this condition. Since /tmp is a memory drive, it is cleared on reboot.
WORKAROUND If you need to save or copy files or logs somewhere, use /cores/service since it has more space and is also the user "service" home dir (/cores/service = /home/service)
Additional Information
Please do NOT use /var/tmp directory to save any files either. Though this directory has much more space than /tmp, repeated use may still cause issue and this directory doesn't clear itself after reboot.