Planned outage of disk array /storage/praha 1

5-10. 10. 2026 - Planned outage of disk array /storage/praha 1

Disk array synchronization for /storage/praha1 is currently in progress following its migration to a new disk array

1. Main Outage and Cutover (Monday, Oct 5)

• Complete storage unavailability: On Monday, October 5, the storage cutover itself will take place. Please anticipate a multi-hour downtime of the /storage/praha1 (/storage/vestec1) storage.
• Compute node outage: We will pause job scheduling on compute nodes located in Prague that use this storage array as their home directory (/home). Other compute nodes in MetaCentrum will continue to run without interruption.
• Attention to data from running jobs: If you have jobs running on October 5 on nodes that are not affected by the outage, and these jobs attempt to write or copy output data to the unavailable storage array, the write operation will fail and the data may remain stored locally on the compute node (in the scratch directory). In such cases, you will need to copy the data manually after the outage concludes.
• Once we verify the proper functionality of the new mounts, user quotas, and automatic snapshots, the affected nodes will be released back into production.

2. Regular Operation and Final Re-synchronization (approx. Oct 5 – Oct 10)

Following the launch on October 5, you will be able to work on the new storage array as usual. In the background over the next ~5 days, a re-synchronization process will copy any remaining changes made on the old storage array between October 1 and October 5.

Safety of your data during the transfer from the old to the new array:

• In the event of a version conflict, your newer files will always take precedence and will not be overwritten by older versions.
• Files that you deleted in the meantime will not be deleted from the old array (no data will be inadvertently removed).
• The original storage array will remain archived for a period of time to resolve any non-standard issues if needed.