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cluster:93 [2011/01/07 20:38] hmeij |
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====== Greentail ====== | ====== Greentail ====== | ||
- | Time to introduce our new high performance cluster '' | + | Time to introduce our new high performance cluster '' |
- | In order to accommodate the new cluster, we have reduced the Blue Sky Studios cluster from 3 racks in production to a single rack. That rack contains nothing but 24 gb memory nodes offering just over 1.1 TB of memory across 46 nodes. | + | In order to accommodate the new cluster, we have reduced the Blue Sky Studios cluster from 3 racks in production to a single rack. That rack contains nothing but 24 gb memory nodes offering just over 1.1 TB of memory across 46 nodes. |
- | The are no changes to the Dell cluster (petaltail/ | + | There are no changes to the Dell cluster (petaltail/ |
+ | |||
+ | If we like the HP management tools, in the future we may ingest cluster petaltail/ | ||
+ | |||
+ | As always, suggestions welcome. | ||
===== Design ===== | ===== Design ===== | ||
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The purchase of the HP hardware followed a fierce bidding round in which certain design aspects had to met. | The purchase of the HP hardware followed a fierce bidding round in which certain design aspects had to met. | ||
- | * We continually run of disk space for our home directories. | + | * We continually run out of disk space for our home directories. |
* We wanted more nodes, in fewer queues, with a decent memory footprint. | * We wanted more nodes, in fewer queues, with a decent memory footprint. | ||
* All nodes should be on an Infiniband switch. | * All nodes should be on an Infiniband switch. | ||
* A single queue is preferred. | * A single queue is preferred. | ||
* Data (NFS) was to be served up via a secondary gigabit ethernet switch, hence not compete with administrative traffic. | * Data (NFS) was to be served up via a secondary gigabit ethernet switch, hence not compete with administrative traffic. | ||
- | * (With the HP solution we will actually route data (NFS) traffic over the infiniband switch, a practice called IPoIB) | + | * (With the HP solution we will actually route data (NFS) traffic over the infiniband switch |
- | * Linux or CentOS as operating system. | + | * Linux (Redhat |
* Flexible on scheduler (options: Lava, LSF, Sun Grid Engine) | * Flexible on scheduler (options: Lava, LSF, Sun Grid Engine) | ||
* The disk array, switches and login node should be backed by some form of UPS (not the compute nodes) | * The disk array, switches and login node should be backed by some form of UPS (not the compute nodes) | ||
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===== Performance ===== | ===== Performance ===== | ||
+ | |||
+ | During the scheduled power outage of December 28th, 2010, some benchmarks were performed on old and new clusters. | ||
+ | |||
+ | In short using linpack (More about [[http:// | ||
+ | |||
+ | * greentail' | ||
+ | * petaltail/ | ||
+ | * petaltail/ | ||
+ | * so the total is 570 gigaflops, but you'd never want to run across both switches simultaneously | ||
+ | * sharptail' | ||
+ | * never got quite all the nodes working together, not sure why | ||
+ | |||
===== Home Dirs ===== | ===== Home Dirs ===== | ||
+ | |||
+ | ===== Passwords ===== | ||
+ | |||
+ | The password, shadow and group files of host petaltail were used to populate greentail' | ||
+ | |||
+ | If you change your password, do it on all four hosts (petaltail, swallowtail, | ||
+ | |||
+ | I know, a pain. | ||
+ | |||
===== SSH Keys ===== | ===== SSH Keys ===== | ||
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* log into a host, then issue the command '' | * log into a host, then issue the command '' | ||
* supply an empty passphrase (just hit return) | * supply an empty passphrase (just hit return) | ||
- | * then copy the contents of / | + | * then copy the contents of / |
- | * yoiu can have multiple public ssh key entries in this file | + | * you can have multiple public ssh key entries in this file |
- | Note: the software stack on host petaltail/ | + | Note: the software stack on host petaltail/ |
To test if your keys are set up right, simply ssh around the hosts petaltail, swallowtail and greentail. | To test if your keys are set up right, simply ssh around the hosts petaltail, swallowtail and greentail. |