Thanks for some great suggestions. In answer to your first question, the
amount Retrospect lists in the Backup Set Properties window is the amount of
data actually sent to the tape. Retrospect has no way of knowing how well
the tape drive was able to compress your data.

In answer to your second set of questions, Retrospect has an internal
counter which it increments whenever you're accessing the tape drive
(backups, compares, restores, rewinds, even if you're just in the Devices
window). It's no more sophisticated than that at this point. Some time in
the future we'd like to implement what you're talking about, but at this
time we're not quite there yet.

Finally, the statistics you speak of are not something Retrospect is capable
of right now, but, again, are something we'd like to implement in the

Thanks again for your suggestions.


Matthew Tevenan
Technical Support Specialist
Dantz Development Corporation

> From: "Michel Joly de Lotbiniere" <[EMAIL PROTECTED]>
> Reply-To: "retro-talk" <[EMAIL PROTECTED]>
> Date: Tue, 18 Apr 2000 16:03:16 -0400
> To: "Retro-Talk" <[EMAIL PROTECTED]>
> Subject: How to determine actual capacity used on tape media?
> Hello,
> Some long, quasi-trivial questions: (I'm using Retrospect Desktop 5.1 on MS
> Windows 2K with a LaCie external Sony AIT-2 drive)
> Am I right in assuming that the "Members" tab on the properties dialog for a
> backup set shows the amount of data sent to the tape device *before* any
> hardware compression take place? Or, is the amount displayed derived from
> some count of the actual number and size of blocks written by the device to
> the media (which some devices' SCSI mode pages would show), i.e. the actual
> media capacity used?
> Reading the relevant parts of the manual's "Management" chapter hasn't
> decided the question for me.
> Where is the actual total of hours of tape use displayed? Retrospect can
> remind when a device needs cleaning--so the data must be saved somewhere.
> The AIT-2 drives are largely self-cleaning according to the Sony manual, but
> will set the CLN bit in a Request Sense command if the drive needs treatment
> with a cleaning cartridge (as well as blinking the drive's LEDs, etc.). Does
> Retrospect write some kind of warning log message when that bit is set? Is
> there any way short of manually totalling backup session logs to find the
> number of hours a given backup member has been in use?
> Also, most tape drives maintain pretty elaborate counts of soft/hard
> read/write errors. These are useful statistics to display in log files,
> since a consistent increase in these numbers on a series of backup sessions
> may show that the media is ripe for retirement. Is there any access to these
> in Retrospect? (Maybe I'm just too used to all the redundant statistics that
> ARCserve so obsessively displays! ARCserve vs. Retrospect: an East coast vs.
> West coast thing? I should probably relax more.)
> // Michel Joly de Lotbinière
> --
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