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Guest
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 Posted: Mon Sep 11, 2006 11:39 pm Post subject: Tape drive underlength/overlength condition |
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Hi All,
What happens when an underlength/overlength condition occurs on the
tape drive?
Does data get transferred at all (partial or otherwise)?
There is a lot discussed about the error conditions and such in the SSC
spec, but nothing about what happens to the data.
Thanks. |
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Rob Turk
Guest
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| Posted: Tue Sep 12, 2006 12:42 am Post subject: Re: Tape drive underlength/overlength condition |
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<be.geek@gmail.com> wrote in message
news:1157999953.646902.20670@i42g2000cwa.googlegroups.com...
| Quote: | Hi All,
What happens when an underlength/overlength condition occurs on the
tape drive?
Does data get transferred at all (partial or otherwise)?
There is a lot discussed about the error conditions and such in the SSC
spec, but nothing about what happens to the data.
Thanks.
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Depends if the tape drive is in fixed block or variable block mode.
In fixed mode the drive transfers all blocks that conform to the expected
block size. When a block of different length is encountered, the tape drive
does not transfer data from that block, regardless if undersize or oversize.
The tape reports a Check Condition with ILI flag in the sense data.
In variable mode, when an oversized block is encountered, all data upto the
specified size in the CDB is transferred. The tape drive reports Check
condition and sets the ILI bit. When an undersized block is found, all data
is transferred. Again the drive sets Check condition, ILI flag. No padding
data is transferred.
Hope this helps,
Rob |
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