LTO/LTFS wear parameters

[642583918]

I found two parameters about wear in LTO SCSI documentation, namely "Begining of medium passes" and "Middle of tape passes".

But I wrote the entire tape and found that there was no change in these two parameters.

sg_logs -a /dev/xxx | grep passes

Regarding wear, are there any problems with the two parameters I observed? If so, does LTO provide other wear parameters?

[piste-jp]

You can fetch the log page with VEA ltfs.vendor.IBM.logPage while tape is mounting by LTFS.

Please check the code src/libltfs/xattr.c.

Counter value itself is not a scope of this project, it shall be managed by H/W vendors. Please contact to drive hardware vendors if you rally think the value is strange.

[642583918]

I am using LTO5 device, I saw the ltfs.mediaBeginningMediumPasses and ltfs.mediaMiddleMediumPasses params in SINA-LTFS-Format-v2.5-Technical-Position document and ltfs code.

If the hardware does not provide data, is it a problem with the connection between ltfs and hardware?

Thanks!

[piste-jp]

No, it is not a problem of the connection at all.

LTFS just reports an error against getxattr() API if a drive does not report any value against a request. errno depends on the symptom.