SCP Disks

Last updated: 2005-Sep-16

SCP disks are divided into a number of different categories:

  1. Home Disk
  2. User Disks
  3. System Disks
  4. Global Scratch Disks
  5. Local Scratch Disks
  6. Temporary Scratch Disks
  7. Deepsearch Data Disks

Home Disk

/home/astro10 is the disk where all the home directories are stored. (The PC home directories are on /home/lilys, but this is on the same disk partition as /home/astro10.) This disk is backed up once a week, and as such is our most precious space. It is a 40GB partition, shared amongst all the SCP computer users.

This is where you store all your usual home directory sorts of things. It's also where you should put source code, papers, slides and overheads, proposals, IDL programs, etc. You should not put image data files on this disk! Because it's only 40GB, and shared between everybody, we simply cannot afford to have people filling this space up with data. The astronomical data we deal with nowadays is too space consuming to be put in a place that's backed up weekly. Especially given that usually once the data is reduced, it doesn't change, it simply doesn't make sense to use up regularly backed up space on it.

/home/astro10 (and /home/lilys) is served by panisse, and is available on all SCP computers.

Mount pointTypeSizeComputer DeviceNotes
/home/astro10Backed Up40GBzacharys /dev/rza1Most home directories; keep it clean!
/home/lilysBacked Up40GBzacharys /dev/rza1Same physical device as astro10 ; keep it clean!

User Disks

Right now, there is only one user disk, /home/astro1. This is a 21GB disk that is not backed up. You should store the same sorts of things here that you store in your home directory, keeping in mind that the home directory is what is backed up most often. Your directory on /home/astro1 should be

If this directory does not exist, ask a sysad to create it for you.

Mount pointTypeSizeComputer DeviceNotes
/home/astro1User21GBspengers /dev/sdb1Last backup 2001/11/21

System Disks

These disks are not available for general use, but are listed here for completeness. They serve either some system administration function, or are a repository for Deepsearch information. Technically, the root and /usr disks on each individual computer should be listed here as well.

Note that even though these aren't available for general user use, many Deepsearch users will modify files on some of these disks, particularly /home/astro9 (when Deep/IDL code is updated) and /home/panisse (the web disk).

Mount pointTypeSizeComputer DeviceNotes
/home/astro9System40GBzacharys /dev/rza2Database disk & Deepsearch software; backed up weekly
/home/panisseSystem12GBzacharys /dev/rza3Web disk; backed up infrequently (if at all).
/home/astro16System15GBzacharys /dev/rza4Library of Sun software; most binaries are linked in /home/astro9/deephome/bin. Backed up extremely infrquently.
/home/ftpSystem12GBzacharys /dev/ anonymous ftp site
/var/spool/mailSystem2GBzacharys /dev/sda7Everyone's mail inboxes. Not currently backed up.
/usr/localSystem2.5GBrustica /dev/sda7/usr/local for all PCs. (Suns' /usr/local is actually hidden away on a Europa disk.) Backed up infrequently.
/home/steegeSystem3GBrustica /dev/sdd1Repository of configuration and system information. Backed up infrquently.
/home/dbSystem4GBlilys /dev/sda5PostgreSQL database; not mounted on most computers. Database is backed up 5 times/week.
/home/astro47Scratch8GBlilys /dev/sda8Used for deepsearch database web support, etc.

Global Scratch Disks

These disks are non-backed up disks which you should consider as "general workspace". This is where you should put data you're working on reducing (unless you've got some personalized local scratch space). This data will not be backed up unless you do it yourself.

These scratch disks are mounted on our file servers. They are accessible from any of the SCP workstations.

Sometimes, some of the disks on rustica will need to be commandeered as work space for search runs. If a search run is impending, you may be asked to completely clear off all of your space used on a scratch disk. Right now, this is most likely to happen on /home/astro45, but it may be on different disks in the future. You're more likely to avoid problems with this if you use scratch space on zacharys and panisse. You will probably see better performance there, anyway, because most of the workstations are on the same subnet as zacharys and panisse. (Rustica is on a different subnet.) For use with the McDonlads cluster, scratch space on Rustica is your best bet.

If you need a directory on a scratch disk where you don't currently have one, talk to Rob (or one of the other system folks).

Mount pointTypeSizeComputer DeviceNotes
/home/astro42/uScratch18GBrustica /dev/sdc1Good general use scratch disk
/home/astro23/scratchScratch18GB spengers /dev/sdc1Good general use scratch disk
/home/astro45/scratchScratch50GB rustica /dev/sde1No longer exists
/home/astro21/scratchScratch9GB spengers /dev/sdd1Also has HST tools, SUN iraf
/home/astro71/scratchScratch70GB kirin /dev/sdb1Reserved for search runs: Avoid use

Local Scratch Disks

Many of the workstations have one or more disks mounted locally. It is to your advantage to use the scratch space local to your computer. Because disk accesses to these disks do not go over the network, performance should be better, and you avoid bogging down the network for everybody else.

It is entirely possible to access these disks from other workstations. However, I recommend that you avoid this except when it's necessary, for various technical reasons of stability that I don't want to go into at the moment. If you need scratch space accessible from lots of different computers, consider using global scratch instead. If you need to use disk space primarily from your own workstation, then a local scratch disk is a good thing.

Some of these scratch disks are designated to be used only by one person. Generally, this will tend to be the person on whose workstation the disk is mounted, for obvious reasons.

Mount pointTypeSizeComputer DeviceNotes
/home/astro61Scratch70GB filippos/dev/sdb1  
/home/astro51/uScratch32GB ajanta/dev/hda8  
/home/astro62/uScratch34GB jimbean/dev/hda7  
/home/astro64/uScratch20GB cha-am/dev/hda5  
/home/astro32/scratchScratch21GB milano/dev/sdb1 
/home/astro63/uScratch28GB milano/dev/hda1 
/home/astro57Scratch18GB pasand/dev/sdb1 
/home/astro52/scratchScratch50GB skates/dev/sdb1 
/home/astro50Scratch18GB dara/dev/sdb1
/home/europa2Scratch18GB europa/dev/dsk/c1t2d0s6 Reserved for Greg Aldering
/home/europa3Scratch18GB europa/dev/dsk/c1t4d0s6 Reserved for Greg Aldering; also has Suns' /usr/local
/home/europa4Scratch70GB europa/dev/dsk/c2t4d0s2 Reserved for Greg Aldering
/home/astro20Scratch21GB europa/dev/dsk/c2t10d0s2 Reserved for Greg Aldering
/home/astro34Scratch18GB europa/dev/dsk/c2t3d0s2 Reserved for Greg Aldering
/home/astro17/uScratch9GB cactus/dev/dsk/c0t2d0s2OFFLINE
/home/astro26/uScratch9GB cactus/dev/dsk/c0t5d0s2OFFLINE
/home/astro22/uScratch9GBrivoli /dev/dsk/c0t2d0s2OFFLINE
/home/spScratch9GBrivoli /dev/dsk/c0t0d0s2 Spectral data
/home/astro31/scratchScratch8.5GBrivoli /dev/dsk/c0t2d0s2OFFLINE
/home/astro28/uScratch9GBskates /dev/dsk/c0t2d0s2OFFLINE
/home/astro30/scratchScratch9GB skates /dev/dsk/c0t5d0s2OFFLINE

Temporary Scratch Disks

Lots of computers have a local disk /scratch which is not exported anywhere. You should, in general, not try to use this space. These directories are subject to immediate deletion without warning at any time. They are there in hopes that one day we'll get a queue manager that can rationally manage our workstations in addition to the McDonalds cluster; these directories will then form local workspace. In the mean time, they may be used manually during search runs for local workspace.

Deepsearch Data Disks

There are several disks which are devoted to deepsearch data, some more to nearby99 data, and maybe even a few to snfactory data. Most of the deepsearch data disks are RAID partitions nowadays, so that the data won't be lost if one disk dies. (It will still be lost if somebody stupidly deletes it, however.) You should NOT make subdirectories in these directories, nor should you work in these directories. These directories are ONLY for data which is in the deepsearch (or nearby99) database.

Mount pointTypeSizeComputer DeviceNotes
/home/astro60Deepsearch50GB nowhere/dev/md0 RAID5 of /dev/sd[b-e]1 (4x18GB). DISABLED
/home/astro53Deepsearch50GB nowhere/dev/md1 RAID5 of /dev/sd[f-i]1 (4x18GB). DISABLED
/home/astro25Deepsearch140GB rustica/dev/md0 RAID5 of /dev/sd[f-i]1 (4x50GB); deepsearch & nearby & snfactory
/home/astro44Deepsearch18GB rustica/dev/sdc1 Also has USNO catalog
/home/astro72Deepsearch210GB kirin/dev/md0 RAID5 of /dev/sd[c-f]1 (4x70GB)
/home/astro80Deepsearch1183GB lococos/dev/md0 RAID5 of /dev/sd[b-i]1 (8x169GB)