Tape errors: how many is considered normal?

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Tape errors: how many is considered normal?

Ivan Adzhubey
Hi,

Below is the SMART TapeAlert output I received after running btape 'test' and
'speed' tests on a new IBM ULTRIUM-HH5 LTO-5 drive using brand new Fujifilm
tape. Is it normal to see 40 (corrected) errors per few GBs of data that the
tests have written to tape?

$ smartctl -H -l error /dev/sgtape1
smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-78-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
TapeAlert: OK
Error counter log:
           Errors Corrected by           Total   Correction     Gigabytes    
Total
               ECC          rereads/    errors   algorithm      processed    
uncorrected
           fast | delayed   rewrites  corrected  invocations   [10^9 bytes]  
errors
read:          0        0         0         0          0          0.010          
0
write:         0        0         0        40         40          0.073          
0

Non-medium error count:        0

Thanks,
Ivan

--
Ivan Adzhubey, Ph.D.
Instructor
Division of Genetics, Dept of Medicine
Brigham & Women's Hospital
Harvard Medical School
New Research Building, Room 0464C
77 Avenue Louis Pasteur
Boston, MA 02115
tel.: (617) 525-4728
fax:  (617) 525-4705
web: http://genetics.bwh.harvard.edu/wiki/sunyaevlab/


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Re: Tape errors: how many is considered normal?

Kern Sibbald
Hello,

I personally do not know the answer to your question, but as long they
are corrected errors and not more than 0.1% of the reads/writes and
there are no uncorrected errors and no tape alerts, I would imagine it
is OK.

Here is what I get on my LTO-5 drive.  It is a reconditioned drive that
I installed about 2 months ago, so it does not have a terribly long history:

root@groschat:/home/kern# smartctl -H -l error /dev/sg0
smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-78-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
TapeAlert: OK
Error counter log:
            Errors Corrected by           Total Correction    
Gigabytes       Total
                ECC              rereads/    errors algorithm      
processed      uncorrected
            fast | delayed   rewrites   corrected  invocations [10^9
bytes]   errors
read:             2        0         0         0 2              
0.000                0
write:      1337        0         0         0 3416                
0.000                0

I would be curious to hear what statistics Alan Brown has since he make
very heavy use of his drives.

Best regards,

Kern



On 06/04/2017 12:37 AM, Ivan Adzhubey wrote:

> Hi,
>
> Below is the SMART TapeAlert output I received after running btape 'test' and
> 'speed' tests on a new IBM ULTRIUM-HH5 LTO-5 drive using brand new Fujifilm
> tape. Is it normal to see 40 (corrected) errors per few GBs of data that the
> tests have written to tape?
>
> $ smartctl -H -l error /dev/sgtape1
> smartctl 6.5 2016-01-24 r4214 [x86_64-linux-4.4.0-78-generic] (local build)
> Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
>
> === START OF READ SMART DATA SECTION ===
> TapeAlert: OK
> Error counter log:
>             Errors Corrected by           Total   Correction     Gigabytes
> Total
>                 ECC          rereads/    errors   algorithm      processed
> uncorrected
>             fast | delayed   rewrites  corrected  invocations   [10^9 bytes]
> errors
> read:          0        0         0         0          0          0.010
> 0
> write:         0        0         0        40         40          0.073
> 0
>
> Non-medium error count:        0
>
> Thanks,
> Ivan
>


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