[mythtv-users] 0.25 - Video repeated "Scan For Changes" forgets things?

[Michael T. Dean]

On 07/12/2012 03:23 AM, Kingsley Turner wrote:
> On 05/07/12 12:44, Kingsley Turner wrote:
>> Hi,
>>
>> I've a bunch of Videos on my MythTV Videos section (not recordings).
>>
>> However when I do "Scan For Changes" sometimes things aren't found. 
>> If I scan again, sometimes they come back, maybe other things 
>> disappear.  I have all my personal rips on a single external hard 
>> drive - twice now all the meta-information has disappeared from these 
>> files.
>
> I had this again today.
>
> It seems that the external USB hard drives are in sleep mode.
> Perhaps they do not come online quick enough .. in the syslog we get 
> these messages:
>
> Jul 12 15:49:12 192.168.1.20 [23453.867268] sd 7:0:0:0: [sde] 
> Unhandled error code
> Jul 12 15:49:12 192.168.1.20 [23453.867280] sd 7:0:0:0: [sde]
> Jul 12 15:49:12 192.168.1.20 Result: hostbyte=DID_OK driverbyte=DRIVER_OK
> Jul 12 15:49:12 192.168.1.20 [23453.867287] sd 7:0:0:0: [sde] CDB:
> Jul 12 15:49:12 192.168.1.20 Read(10)
> Jul 12 15:49:12 192.168.1.20 :
> Jul 12 15:49:12 192.168.1.20 28
> Jul 12 15:49:12 192.168.1.20 00
> Jul 12 15:49:12 192.168.1.20 03
> Jul 12 15:49:12 192.168.1.20 f0
> Jul 12 15:49:12 192.168.1.20 0e
> Jul 12 15:49:12 192.168.1.20 bf
> Jul 12 15:49:12 192.168.1.20 00
> Jul 12 15:49:12 192.168.1.20 00
> Jul 12 15:49:12 192.168.1.20 08
> Jul 12 15:49:12 192.168.1.20 00
> Jul 12 15:49:12 192.168.1.20
> Jul 12 15:49:12 192.168.1.20 [23453.867328] end_request: I/O error, 
> dev sde, sector 66064063
> Jul 12 15:49:12 192.168.1.20 [23453.867415] XFS (sde1): metadata I/O 
> error: block 0x3f00e80 ("xfs_trans_read_buf") error 5 buf count 4096
> Jul 12 15:49:19 192.168.1.20 [23460.732392] sd 6:0:0:0: [sdd] 
> Unhandled error code
> Jul 12 15:49:19 192.168.1.20 [23460.732405] sd 6:0:0:0: [sdd]
> Jul 12 15:49:19 192.168.1.20 Result: hostbyte=DID_OK driverbyte=DRIVER_OK
> Jul 12 15:49:19 192.168.1.20 [23460.732755] sd 6:0:0:0: [sdd] CDB:
> Jul 12 15:49:19 192.168.1.20 Read(10)
> Jul 12 15:49:19 192.168.1.20 :
> Jul 12 15:49:19 192.168.1.20 28
> Jul 12 15:49:19 192.168.1.20 00
> Jul 12 15:49:19 192.168.1.20 03
> Jul 12 15:49:19 192.168.1.20 f8
> Jul 12 15:49:19 192.168.1.20 41
> Jul 12 15:49:19 192.168.1.20 5f
> Jul 12 15:49:19 192.168.1.20 00
> Jul 12 15:49:19 192.168.1.20 00
> Jul 12 15:49:19 192.168.1.20 08
> Jul 12 15:49:19 192.168.1.20 00
> Jul 12 15:49:19 192.168.1.20
> Jul 12 15:49:19 192.168.1.20 [23460.732799] end_request: I/O error, 
> dev sdd, sector 66601311
> Jul 12 15:49:19 192.168.1.20 [23460.732875] XFS (sdd1): metadata I/O 
> error: block 0x3f84120 ("xfs_trans_read_buf") error 5 buf count 4096
>
> And all the files disappear.
> If you "Scan For Changes" again, they're back, but with no meta data.
> So then I have a nearly a thousand files to re-meta.
>
> Is this worthy of a bug report?
> Is it a bug ?

IMHO, no.  We're doing the best we can with the information we 
have--i.e. when the files we saw disappear (in this case because your 
file system isn't working), we assume you deleted them.  You can switch 
to a non-USB connection for reliability, or just ensure you "manually" 
spin up/"renew" the USB connection to the drives before doing a Video 
Library scan.

Raymond Wagner will be including a rewrite of the scanner in a future 
version of MythTV which will better cope with 
umounted/broken/missing/... file systems, so when we support that 
feature, it will fix any problems you're having with your current setup.

Mike