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cluster:93 [2010/12/31 23:15]
hmeij 		cluster:93 [2011/01/07 20:31]
hmeij
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 ====== Greentail ====== ====== Greentail ======
 +
 +Time to introduce our new high performance cluster ''greentail'', an HP HPC solution.  IF you want to read more about the details of the hardware, you can find it at [[https://dokuwiki.wesleyan.edu/doku.php?id=cluster:83#round_2_of_quotes|Enternal Link]]. The reference for ''greentail'' is because this cluster consumes 18-24% less power/cooling that the competing bids.  The green tail refers to the **Smooth Green Snake**, which no surprise, has a green tail.  [[http://www.ct.gov/dep/cwp/view.asp?A=2723&Q=325780|External Link]] for more information.
 +
 +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.  Because the cluster is not power consumption friendly, it is our "on demand" cluster.  If jobs are pending in the sole ''bss24'' queue (offering 92 job slots), we will get notified and will poer on more nodes.  If it is not being used, we'll power down the nodes.  The login node for this cluster is host sharptail (which can only be reached by first ssh into host petaltail or swallowtail, then ssh to sharptail.
 +
 +The are no changes to the Dell cluster (petaltail/swallowtail).  However be sure to read the home directory section below.  It is important all users understand the impact of changes to come.
  
 ===== Design ===== ===== Design =====
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 ===== SSH Keys ===== ===== SSH Keys =====
 +
 +Within the directory **/home/username/.ssh** there is a file named **authorized_keys**.  Within this file are your public SSH keys.  Because your home directory contents are copied over to host greentail, you should be able to ssh from host petaltail or swallowtail to host greentail without a password prompt.  If not, your keys are not set up properly.
 +
 +You can also log in to host greentail directly (''ssh username@greentail.wesleyan.edu'').  From host greentail should be able to to ssh to host petaltail or swallowtail without a password prompt. If not, your keys are not set up properly.
 +
 +To set up your ssh keys:
 +
 +  * log into a host, then issue the command ''ssh-keygen -t rsa''
 +  * supply an empty passphrase (just hit return)
 +  * then copy the contents of /home/username/.ssh/id_rsa.pub into the file authroized_keys
 +  * yoiu can have multiple public ssh key entries in this file
 +
 +Note: the software stack on host petaltail/swallowtail created ssh keys for you automatically upon your first login, so for most you this is all set.
 +
 +To test if your keys are set up right, simply ssh around the hosts petaltail, swallowtail and greentail.
  
 ===== Rsnapshot ===== ===== Rsnapshot =====
cluster/93.txt ยท Last modified: 2011/01/11 20:55 by hmeij

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