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Cisco Bug: CSCsz17080 - File action on PRE-2 disk fails with "TF I/O failed in data-in phase"

Last Modified

Feb 17, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(33)SB 12.2(33)SCB

Description (partial)

* This issue can occur with any file action regardless of redundancy.

Symptoms: There are several symptoms.
1. Copying files from the active to standby or vice versa. The error could 

"%Error writing stby-disk0: (TF I/O failed in data-in phase)".
2. A failed MD5 checksum when reading a file off the disk. This may or may 
not indicate a previous failure that went unnoticed.
Not all disk errors and not all MD5 checksum errors are due to this problem!

3. The disappearance of Smart Modular 128MB PCMCIA cards, typically on the 
standby PRE.
Conditions: There was a recent change in the Cisco IOS DOS compatible file 
system. That change resulted in a higher performance file system. But, there 
is a condition which has been seen on at least one variant of flash card that 
can lead to disk errors and file system damage. This condition arises from a 
gray area of the ATA specification and can be fixed in software.
The issue is possible with Cisco IOS Release 12.2(33)SB.

This issue is not present in Cisco IOS Release 12.2(31)SB.
In particular, this card is susceptible: STI 7.4.0 Compact Flash and PCMCIA 
Flash cards.
Other cards may or may not have the same issue, but empirical data indicates 
that other cards are at least somewhat less susceptible.
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Bug Details Include

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