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Starting from August September 2024, NHR@ZIB will replace the the underlying hardware of Lise’s global file systems HOME and WORK for all compute systems of Lise in Berlinwill be replaced. This affects all login nodes and all Compute compute partitions. Please be aware of the following activities.
oneOne-week downtime for maintenance - The replacement of the file systems HOME and WORK is prepared.
two-month migration phase - Users can copy data from the old to the new WORK file system.
All data in the HOME file system will be copied by NHR@ZIB staff. Users do not have to do anything on the HOME file system.
Time schedule
The steps in the table will be executed consecutively.
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step
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estimated date
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subject
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1
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mid August
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email update for the migration plan
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2
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end of August
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one week maintenance
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3
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September
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three weeks usual operation without changes
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4
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Sept-Nov
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two months migration phase, copy data from old to new WORK
Migration phase for WORK
As step number 4 in section Time schedule, data migration for the WORK file system follows these steps.
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Migration phase
This is a two months period starting in September.
You have access to two different WORK file systems, the old and the new one.
The new WORK file system is empty and you are invited to copy data to the new WORK file system.
NHR@ZIB staff will not copy any data to the new WORK file system.
After the end of the migration phase
, preparation steps, and for preliminary transfer of HOME data. NHR@ZIB staff copies all data from the old to the new HOME storage. No user action is required.
One-day maintenance of the entire system for a final synchronization step between old and new HOME. Old HOME goes offline, new HOME goes online. No user action is required.
Two-month Migration phase for WORK. During this period, both the old and new WORK file systems are available. Users transfer their data from the old to the new WORK storage.
Schedule
step | estimated start date | subject | status |
|---|---|---|---|
1 | September 30 | one-week downtime of the GPU clusters (A100 and PVC), CPU CLX cluster remains available | ● |
2 | End of November | one-day maintenance for all compute systems | ● |
3 | End of November | two-month migration phase for users to copy their data from the old to the new WORK storage | ● |
● completed
● open
Migration phase for WORK
In step 3 of the schedule, data migration for WORK will be organized as follows.
Active migration phase:
a two-month period starting in October
simultaneous user access to the old and new WORK file systems
data transfer by users from the old to the new WORK storage (no data transfer by NHR@ZIB staff)
Post migration phase:
only the new WORK file system is available
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the old WORK file system is switched off
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, its data is deleted
Remarks
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WORK is a scratch file system
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- that means, no backups are available! Data can get lost any time, due to user mistakes or due
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to system failures. Users need to copy important data (job results) to a safe place.
WORK is a file system shared by all users. It is important that only data actively used in computations (“hot” data) reside here. WORK is not intended to store backups, software installations, and other kinds of “cold” data.
The PERM file system is not affected by this maintenance. During all times of Lise operation
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, PERM will be available
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to each user.