Saga Maintenenace Downtime 18th-19th February 2021

Dear Saga user. We need to schedule a small downtime of Saga from Thursday 18th February 2021 starting at 08:00, until Friday 19th February 2021, ending at 16:00. If maintenance is finished earlier, we will also open up the machine earlier.

During the maintenance, we will continue the work we started in early december and connect the new storage expansion to the system, and make it available for general use. This will give us several Petabyte extra for project storage and other usage..

We apologize for the inconvenience

[RESOLVED] Saga downtime. 7th December-11th December. Adding 4PB storage.

As previously announced, Saga will be down in the coming week, from 7th December 08:00 until 11th December 16:00.

The downtime is allocated for expanding the storage. When we come back we will have ca 4 Petabyte in addition to the already existing 1 PetaByte.

Update: Saga is back online and running jobs again. The new storage is not online yet, but all the hardware has been mounted.

Please cleanup data on Saga!

Dear users on Saga,

currently, usage on Saga’s parallel file system (everything under /cluster) is at about 93%. Already, some of the file system servers are not accepting new data. If usage increases even further, soon the performance of the parallel file system may drop significantly, then some users may experience data loss and finally the whole cluster may come to a complete halt.


Therefore, we are kindly asking all users with large usage (check with the command dusage) to cleanup unneeded data. Please, check all storage locations you’re storing data, that is, $HOME$USERWORK, project folders (/cluster/projects/...) and shared folders (/cluster/shared/...). Particularly, we’re asking users whose $HOME quota is not (yet) enforced (see line with $HOME in example below) to reduce their usage as soon as possible. Quota for $HOME if set is 20 GiB.

[saerda@login-3.SAGA ~]$ dusage -u saerda
Block quota usage on: SAGA
File system   User/Group   Usage   SoftLimit     HardLimit 
saerda_g  $HOME             6.9 TiB 0 Bytes     0 Bytes
saerda    saerda (u)        2.8 GiB    0 Bytes       0 Bytes

In parallel, we are trying to help users to reduce their usage and to increase the capacity of the file system, but these measures usually take time.

Many thanks in advance!

Change to the “optimist” jobs

The requirements for specifying optimist jobs has changed. It is now required to also specify –time. (Previously, this was not needed nor allowed.) The documentation will be updated momentarily.

(The reason for the change is that we discovered that optimist jobs often would not start properly without the –time specification. This has not been discovered earlier because so few projects were using optimist jobs.)

Saga: file system issues

We’re currently having some issues with the storage backend on Saga. Users will experience a hanging prompt on the login nodes and when attempting to connect to them. We’re actively working on resolving these issues and apologize for the inconvenience.

UPDATE 2020-07-19 13:00: The issues on Saga has been resolved and we are resuming normal operations.

UPDATE 2020-07-09 13:20: We needed to reboot a part of the storage system to mitigate the file system issues. For now, we’re monitoring the situation and will send an update tomorrow. Users are advised to check results/jobs that ran from about midnight to noon today, however, we do not recommend rescheduling or submitting new jobs for now. Login nodes should be functional.