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cluster:100 [2011/03/28 10:00] hmeij |
cluster:100 [2011/03/28 10:17] hmeij |
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On 03/25/2011 quotas have been enabled on cluster greentail. | On 03/25/2011 quotas have been enabled on cluster greentail. | ||
- | Here is what was put in place, and will mature over time. But first, it is important to understand: | + | Here is what was put in place, and will mature/ |
* A quota is not disk space allocated for you, as in reserved. | * A quota is not disk space allocated for you, as in reserved. | ||
* Reason for quotas: to avoid /home from filling up by a runaway process, and constrain large users from growing beyond arbitrary thresholds. | * Reason for quotas: to avoid /home from filling up by a runaway process, and constrain large users from growing beyond arbitrary thresholds. | ||
- | The quotas fall into two tiers: the sliding tier and the custom tier. | + | The quotas fall into two tiers: the "sliding" |
* In the sliding tier, when you reach your soft limit, notify HPC admins and your quota will slide to the next strata (< 90/100G, < 225/250G, < 450/500G, < 700/750G). Once you reach the last strata, and you still need more disk space, you enter the custom tier. | * In the sliding tier, when you reach your soft limit, notify HPC admins and your quota will slide to the next strata (< 90/100G, < 225/250G, < 450/500G, < 700/750G). Once you reach the last strata, and you still need more disk space, you enter the custom tier. | ||
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**Array** | **Array** | ||
- | * 48 TB minus 4 global spares | + | * 48 one TB disk minus 4 global spares |
- | * after formatting 36 TB available | + | * after formatting 36 TB available |
- | * /home 10, / | + | * /home 12 disks, / |
+ | * leaves | ||
* snapshots holds base plus deltas hence needs to be somewhere between 1-2x base | * snapshots holds base plus deltas hence needs to be somewhere between 1-2x base | ||
- | * so if we wanted to increase home, we could not use sanscratch (is anybody using it?) | + | * so if we wanted to increase home, we delete |
* if we do not backup, then ... questions for later | * if we do not backup, then ... questions for later | ||