Exabyte 8505 and 10 Gb capacity

2007-12-25 8:46:00

Sun-Managers:

This was a case of RTFM, but not realizing that compression required

a special option to enable.

Chuck Foley said it best:

> You should be using /dev/rmt/0c to write with compression

> turned on....The man page (Solaris 2.3) for "st" indicates this

> (near the end, there is a chart of density specifications and

> the density actually written for different drive types.

-- Bob

Thanks to:

jpl@allegra.att.com (John P. Linderman)

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My original Posting:

Sun-managers,

There has been a lot of discussion about tape drives of late, but

now I have a query of my own. We have two Exabyte 8505 8mm tape

drives connected to a SPARCserver 1000 (6 processors, Solaris 2.3)

which are claimed to have a ~10 Gb capacity using built-in hardware

compression. However, we have not been able to store more than

~5 Gb per tape (this makes no difference whether the tape is new

or old [I've seen the report about tape drives using the lower

density instead of the higher one for used tapes, but we're seeing

this behavior with new tapes as well!]).

A 'probe-scsi-all' shows the drives as '8505.....', but we see

8500 behavior. We are using '/dev/rmt/0h' (not 'l' or 'm'). Has

anyone seen/solved this problem?

Thanks in advance, and of course I'll summarize.

-- Bob

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email: worsham@aer.com fax: (617) 661-6479

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