Copy data from tape
Hi,
I having problem copy data from tape. The is Archive Python tape drive. This is what id do: Step 1 Code:
tar -b 512 -tvf /dev/st0 Code:
tar: /dev/st0: Cannot read: Input/output error Code:
mt -f /dev/st0 status dd copy not working. No data copy. Please assist me. Thanks. |
Since you are able to issue the mt command, I assume you have the correct permissions. But just to be sure, try your first command as root.
Overall, this looks an awful lot like a failing tape drive or failing tape. jlinkels |
Yes, i did in root permissions. Are you confident tape problem? I think so but i need solid proof to report my manager.
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Tape or tape drive. Try another tape, perform a write/read sequence. You could also attempt to run a cleansing tape. ButI can tell you for sure this is not a driver/software problem. The bits on the tape are not appearing correctly on the output of the drive. That is a mechanical or physical failure.
jlinkels |
This is 4mm tape drive. Last time i read 3590 and 3592, with same pc no problem at all. Some of my friend said this 4mm sometimes complicated. Let me give some example:
1. Tape A cannot be read by tape drive A but it can be read by tape drive B. Either way around. |
Are you sure the tape was written with a 512-byte block size? Check /var/log/messages for an "Incorrect block size" message. You can find the actual block size by putting the drive in variable block size mode and then trying to read a huge block:
Code:
mt -f /dev/st0 setblk 0 |
Sounds awfully like a miss-alligned head. How long ago was the problem tape written?
1. As jlinkels suggested try a new tape and do a write and read the data back. 2. You are sure the data was written with tar and not cpio or dump? 3. Did you try a cleaning tape? |
This tape is year 1990. You must be surprised. This data very important.
---------- Post added 04-19-12 at 08:03 PM ---------- Nothing error on /var/log/message |
Not really surprised. The problem is in the fact that your heads got miss-aligned. This is a commen problem with drives that use a helical scan system. The only option you got is to have a professional company to re-align the heads so they can read the old tapes.
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