cluster:100
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cluster:100 [2011/03/28 13:20] hmeij |
cluster:100 [2011/03/28 14:23] (current) 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 (<100G, <250G, <500G, <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). Once you exceed |
| - | * In the custom tier, we set a quota after agreeing on size and availability of disk space, plus 100G. Then you are on your own. | + | * In the custom tier, we discuss setting |
| - | We urge all users to consider archiving data and files off the cluster disk array. | + | We urge all users to consider archiving data and files off the cluster disk array. Any quota can ofcourse **shrink**, please let us know if you move files off the array and free up disk space for others. |
| How to find my quota? You can find your quota levels and current usage as follows. | How to find my quota? You can find your quota levels and current usage as follows. | ||
| * The hard block limit is the absolute maximum amount of disk space that a user can use. Once this limit is reached, no additional disk space can be used. Writes to disks will fail. | * The hard block limit is the absolute maximum amount of disk space that a user can use. Once this limit is reached, no additional disk space can be used. Writes to disks will fail. | ||
| - | * The soft block limit defines the maximum amount of disk space that can be used. Unlike the hard limit, the soft limit can be exceeded for a certain amount of time. That time is known as the grace period. | + | * The soft block limit defines the maximum amount of disk space that can be used. Unlike the hard limit, the soft limit can be exceeded for a certain amount of time. That time is known as the grace period. Warnings will appear in your terminal/ |
| * The grace period is globally set for 7 days. | * The grace period is globally set for 7 days. | ||
| + | * We do not enforce inode limits. | ||
| < | < | ||
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| ==== Notes ==== | ==== Notes ==== | ||
| - | | + | **Implementation** |
| * add usrquota, | * add usrquota, | ||
| * log everybody out or reboot (quota error on boot, not initialized yet) | * log everybody out or reboot (quota error on boot, not initialized yet) | ||
| Line 49: | Line 51: | ||
| * group quota numbers do not add up !? | * group quota numbers do not add up !? | ||
| - | | + | **Array** |
| - | * 48 TB minus 4 global spares | + | |
| - | * after formatting 36 TB available | + | * 48 one TB disk minus 4 global spares |
| - | * /home 10, / | + | * after formatting 36 TB available |
| + | * /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 | ||
| - | | + | **Links** |
| * [[http:// | * [[http:// | ||
| * [[http:// | * [[http:// | ||
cluster/100.1301318424.txt.gz · Last modified: 2011/03/28 13:20 by hmeij
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