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Tape drives available at the Blanco Telescope

Below is a list of the IRAF and UNIX device names and their capacities.

Drives on CTIOA8

IRAF Name UNIX Name Description Capacity Write Time
mta (DDS4) /dev/nst0 DAT drive, compressed
DDS4 (150m) tape		 ~30Gb
= ~205 images		 -

Drives on CTIOZM

IRAF Name UNIX Name Description Capacity Write Time
mtc (*) /dev/nst0 DLT 8000, high density
DLTIV tape		 ~50Gb
= ~356 images		 -
mtc (*) /dev/nst0 DLT 7000, high density
DLTIV tape		 ~35Gb
= ~241 images		 -
mta (DDS4) /dev/nst1 DAT, compressed
DDS4 (150m) tapee		 ~30Gb
= ~205 images		 -

* NOTE: The density on the ctiozm DLT drive is selected by pushing the button on the front of the drive. If you use a DLT 7000 tape drive at your home institution, BE SURE that the ``35Gb'', NOT the ``40Gb'', light is lit.

Drives on CTIO4M

IRAF Name UNIX Name Description Capacity Write Time
mta (DDS3) /dev/rmt/2ln DAT drive, uncompressed
DDS3 (125m) tape		 ~12 Gb
= ~82 images		 -
mtac (DDS3) /dev/rmt/2cn DAT drive, compressed
DDS3 (125m) tape		 18.5 Gb
= 127 images		 -
mta (DDS4) /dev/rmt/2ln DAT drive, uncompressed
DDS4 (150m) tape		 ~20 Gb
= ~137 images		 -
mtac (DDS4) /dev/rmt/2cn DAT drive, compressed
DDS4 (150m) tape		 ~30 Gb
= ~205 images		 -
mtb
mtbhi		 /dev/rmt/4mn Exabyte 8505 (high density)
112m tape		 4.8 Gb
= 33 images		 ~2:22/135Mb image
mtbc
.		 /dev/rmt/4cn Exabyte 8505 (high density, compressed)
112m tape		 7.1Gb
= 49 images		 ~2:01/135Mb image
mtclo
.		 /dev/rmt/3ln DLT 7000, low density (DLT4000 mode)
DLTIV tape		 20.4 Gb
= 140 images		 ~1:36/135Mb image
mtcloc
.		 /dev/rmt/3mn DLT 7000, low density, compressed
(DLT4000 mode, compressed)
DLTIV tape		 26.4 Gb
=181 images		 ~0:53/135Mb image
mtc
mtchi		 /dev/rmt/3hn DLT 7000, high density
DLTIV tape		 35.2 Gb
= 241 images		 ~0:30/135Mb image
mtchic
.		 /dev/rmt/3un DLT 7000, high density, compressed
DLTIV tape		 42.8 Gb
= 293 images		 ~0:25/135Mb image

NOTE: Compressed capacities quoted above are for RAW images. Compression of reduced images will be MUCH less; capacities for writing reduced images using compression will be only ~5-10% more than uncompressed capacities.

The DDS3 drive can also write DDS format (90m) tapes, but since their capacity is relatively small (~1.8Gb uncompressed, ~2.4Gb compressed), their use with Mosaic datasets is limited and not recommended.

Also available are tape drives on ctioa7:

And currently only available upon request...

Last modified: 12 Oct 2006 by Tim Abbott; tabbott-at-noao.edu.
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