[geeks] [rescue] Fwd: [Bacula-users] LTO tape users beware: Use of MAXELL media harmful to your drives.

Fri Oct 13 15:11:58 CDT 2017

Thatbs a lot of headers!

Sent from my iPhone

> On Oct 13, 2017, at 12:59, Phil Stracchino <phils at caerllewys.net> wrote:
>
> This is information everyone who uses LTO tape should probably have.
>
> Turned out my tapes included three HP tapes with Maxell media.  All of
> my IBM tapes had Fuji media.  And the Imation tapes were of course all
> Sony media, but that's not a surprise.
>
>
>
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> Subject: [Bacula-users] LTO tape users beware: Use of MAXELL media
> harmful to your drives.
> X-BeenThere: bacula-users at lists.sourceforge.net
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> Errors-To: bacula-users-bounces at lists.sourceforge.net
>
>
> (I've been working on this issue for several years. The industry has not
> been overly cooperative and I thank HPE for finally admitting issues)
>
>
> If you have MAXELL LTO media, you should discontinue use of it ASAP.
> (NB: MAXELL no longer produce LTO media of any kind and stopped doing so
> about 2 years ago.)
>
>
> IMPORTANT: MAXELL media may be present in virtually any brand of LTO
> Ultrium cartridge (see below)
>
>
>
> There are 2 reasons for this warning:
>
>
> 1: Excessive head wear
>
> MAXELL LTO media is extremely abrasive - outside LTO specs - and use of
> it results in head wear well beyond what is considered normal for LTO
> drives (HPE refer to it as "pole tip recession")
>
> This excess wear leads to degradation of write/read speeds along with
> numerous rewrites of data and eventually the drive will become unusable
> long before it should be.
>
>
> 2: Destruction of drives
>
> Based on our tests and experience, MAXELL LTO media may destroy your
> drive's read/write heads. The risk is significantly higher if you have
> an IBM LTO drive.
>
>
>  Some LTO tapes with MAXELL media have an unknown serious issue which
> results in total failure of the drive heads. This may occur at any point
> in the tape but commonly happens about 3/4 of the way in.
>
>  I suspect this is related to a faulty servo track on the tape (there
> are 4), but without openness from MAXELL and the LTO industry, it
> remains only a suspicion.
>
>
> WARNING: Because the issue usually only manifests once the tape has a
> large amount of data on it, that tape may appear "normal" although not
> holding as much data as it should (on LTO5 it usually occurs around
> 1100GB into the tape for non-compressible data) . The _next_ tape put
> into the drive will fail completely and if you blame that one for the
> failure, you'll never solve the problem.
>
> This catastrophic damage happens on HP LTO drives with about 1 in 300
> LTO cartridges containing MAXELL media.
>
> It occurs on IBM LTO drives with about 1 in 20-50 LTO cartridges
> containing MAXELL media.
>
>
> (We originally suspected heavy tape contamination ex-factory and that
> the damage then passed onto the next tape, but neither suspicion has
> proven to be correct.)
>
>
>
> IMPORTANT:
>
>
> 1: Faulty MAXELL media may test fine in HP drives, but still destroy IBM
> drives. I know, because I've seen it happen - repeatedly.
>
> 2: Attempting to read a faulty tape will result in tape head destruction
> too.
>
> 3: No amount of drive head cleaning or tape media cleaning will prevent
> this occurring or prevent recurrences.
>
> 4: MAXELL media may be present inside virtually any brand of cartridge.
> Whilst it is possible to work out if the media pancake inside a
> cartridge could be MAXELL based on its serial number,  the only reliable
> way to verify the manufacturer of the actual media is to read the tape's
> internal RFID chip. This contains details of both the OEM/OEM serial
> number and the media manufacturer/pancake serial number.
>
>
> External readers such as Veritape units can read the chip without
> inserting the cartridge into a drive, otherwise the procedure for
> checking this information is:
>
>
> 1: Insert the cartridge into the drive. DO NOT FORWARD SPACE.
>
>
> 2: If your system has the sg_read_attr command (sg3_utils 1.42 or
> later), then use the following command:
>
>
> #  sg_read_attr /dev/{drive}
>
> you will get a readout of the user-facing parts of the onboard chip.
>
> at "Vendor specific medium attribute 0x1000: ", in the first line's
> ascii decode section you will see some garbage output ending with "MAXE"
> in cleartext and on the next line "LL  ........" (Or
> "SONY"/"TDK"/"FUJI"/others - manufacturer info is contained in bytes
> 12-19 of this attribute.)
>
> 3: If you don't have sg_read_attr (or would like to see the decoded
> results of 0x1000), then follow this procedure:
>
>  3.1: Identify the generic device (/dev/sgX) of your drive
>
>  3.2:  /usr/bin/sg_raw -o - -r 1024 -t 60 -v {/dev/sgX} 8c 00 00 00 00
> 00 00 00  00 00 00 00 04 00 00 00 > /tmp/ltomam
>       (If you have sg_read_attr, then sg_read_attr  -r {DEVICE} >
> /tmp/ltomam)
>
>  3.3: read the file using the modified (extended) version of Robin
> Johnson's "read_attribute.pl " script I have provided at:
>       http://www.mssl.ucl.ac.uk/~ajb2/LTO/
>
>
> This script is heavily commented and if anyone wants to make it better,
> please do so.
>
>
>
>
>
>
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