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Sun Enterprise 3500 ("ocean.stanford.edu")

"Ocean" is an 8 CPU server with 4 Gigs of memory running Solaris 5.7. It has eight hot-swappable FC-AL (Fibre Channel Arbitrated Loop) SCSI hard disks. Connected to the server is an external storage RAID system with a capacity of 1.6 TB.

The server was retired after 13 years of dedicated service. It has been replaced by a new self-built server, 'icy.stanford.edu'. This self-built server contains two Intel Xeon E5520 Nehalem 2.26Ghz Quad-core processors, along with plenty of memory and disk space. Icy's operating system is CentOS 5 (64-bit, linux). Icy is now hosting the ocean.stanford.edu website as well.

Helpful information for ocean-users:

Disk Space: Disk space is divided over several partitions of various sizes. The command 'df' will tell you how much space is available on each. Here is a (condensed) snapshot of disk usage taken April 29, 2005:

     Filesystem           kbytes    used      avail     capacity  Mounted on
     /dev/dsk/c0t0d0s4    5308142   4767353   487708       91%    /export/home
     /dev/dsk/c0t2d0s3    8750565   7985380   677680       93%    /data2
     /dev/dsk/c0t2d0s4    8750565   7735646   927414       90%    /data3
     /dev/dsk/c0t3d0s0    8706617   7179324   1266095      86%    /data4
     /dev/dsk/c0t3d0s1    8706617   6947745   1497674      83%    /data5
     /dev/dsk/c2t4d0s6    70588665  65350788  4531991      94%    /data6
     /dev/dsk/c2t5d0s6    70588665  68646875  1235904      99%    /data7
     /dev/dsk/c2t6d0s6    70588665  57699848  12182931     83%    /data8
     /dev/dsk/c0t2d0s5    17512054  14974237  2362697      87%    /data9
     /dev/dsk/c3t2d0s6    576571101 338186347 232619043    60%    /raida
     /dev/dsk/c3t2d1s6    288285170 217542816 67859503     77%    /raidb
     /dev/dsk/c3t2d1s7    288285170 257967184 27435135     91%    /backup

As is indicated above disk space in the home directories (/export/home or /home) is very limited. The size of the partition is about 5Gb but it is 91% filled. Therefore this is not the place for storing large files. However, since the home directory is backed up daily it is the ideal place to put your scripts which are normally small text files.

The best place to store your large files, like model output, processed satellite images, etc., is on one of the /data disks or the RAID (/raida, /raidb). The disk sizes are as follows:
     /home        5Gb (but normally only <0.5Gb availabe)
     /data2-5     9Gb
     /data6-8    72Gb
     /data9      18Gb
     /raida    ~600Gb
     /raidb    ~300Gb

The /backup partition (which is also on the RAID) is for backup only. You cannot write to it, but you can easily retrieve files from there if you accidentilly have deleted something (see below). /data0 and /data1 have been 'retired', but the original contents is still available on /raida.

Since the RAID is not backed up this is the ideal place for putting the raw satellite scenes and other data which can easily be reordered or otherwise regenerated. Also, feel free to backup documents from your desk computer to the RAID.

The server has 8 CPUs, so 8 jobs can be run at the same time without sacrificing speed. You can check the load with the command top. A load of 8 means that the CPUs are busy 100% of the time. Since this is a shared system do not start too many model runs at the same time (or ask other users if it is ok if you plan to run more then 4).

Personal Website
The files for your personal webpages should go in the ~/public_html directory. If you name your homepage 'index.html' it will then be available to the world as ocean.stanford.edu/yourusername

(1) RAID (/backup) - The home directories and /data2-9 are backed up to the RAID (/backup). These are not incremental backups, so everytime a partition is backed up, the previous backup is overwritten. For the /home directories a weekly backup which is generated on Sunday is retained. The RAID itself (/raida and /raidb) is not backed up. The backup schedule is as follows:

     Monday      /home   /data6
     Tuesday     /home   /data7
     Wednesday   /home   /data8    /data9
     Thursday    /home   /data6
     Friday      /home   /data7
     Saturday    /home   /data2-5  /data8
     Sunday      /home (weekly)    /data9

(2) Off-site backup - A semi-automated off-site backup of all of ocean (except the RAID) and some of the PC/Macs has also been implemented. The backup center is located in Sunnyvale, CA.

(3) Tape - The system and home directories and /data2-data5 are also backed up to tape. These are incremental ufsdumps spread over 2 sets of 10 tapes, each covering a 2 week schedule. The schedule below shows the dump level for each backup. All files changed since a backup was done at a lower dump level are backed up. Dump level 0 is the full backup. Since this is a semi-manual process days can be skipped. It is also harder to retrieve files from tape then from the /backup partition of the RAID. However, files can be retrieved changed further back in time. Older sets of these are stored off-site.

     Mounted        |  wk1   wk1   wk1   wk1   wk1   wk2   wk2   wk2   wk2   wk2
     filesystem     |  mon   tue   wed   thu   fri   mon   tue   wed   thu   fri
     /              |   2     3     4     0     1     2     3     4     0     1
     /var           |   1     2     3     4     0     1     2     3     4     0
     /export/home   |   1     1     1     1     0     1     1     1     1     0
     /data2         |               0                             1
     /data3         |   1                             0
     /data4         |         1                             0
     /data5         |               1                             0 

(4) DVD - Partial disk backups are burned on DVDs. These can hold ~4Gb each, and serve as permanent backups. DVDs are stored off-site.