mhvtl lessfs and data protector

[michel...@gmail.com]

Hi everybody,
i'm working on the configuration of ESOS on a box connected via FC to another host, I want to use it as a target backup device with mhvtl and lessfs.

I already setup the changer and the tape device, the backup host can see the device and Data protector see the drives and the slots, but when I try to format or scan a Tape I get this error:

Cannot load exchanger medium ([1117] The request could not be performed because of an I/O device error

This is the device.conf
VERSION: 3

Library: 10 CHANNEL: 0 TARGET: 1 LUN: 0
 Vendor identification: HP
 Product identification: MSL3020 series
 Description: NASDrive
 Product revision level: 5500
 Unit serial number: XYZZY_10
 NAA: 10:22:33:44:ab:cd:ef:00

Drive: 11 CHANNEL: 0 TARGET: 1 LUN: 1
 Library ID: 10 Slot: 1
 Vendor identification: HP
 Product identification: Ultrium 4-SCSI
 Product revision level: 5500
 Description: NAS Drive 1
 Unit serial number: XYZZY_11
 NAA: 10:22:33:44:ab:cd:ef:01
 VPD: b0 04 00 02 01 00

Drive: 12 CHANNEL: 0 TARGET: 1 LUN: 2
 Library ID: 10 Slot: 2
 Vendor identification: HP
 Product identification: Ultrium 4-SCSI
 Description: NAS Drive 2
 Product revision level: 5500
 Unit serial number: XYZZY_12
 NAA: 10:22:33:44:ab:cd:ef:02
 VPD: b0 04 00 02 01 00
 

I appreciate if someone have some idea on how makeing it works

Mike

[Marc Smith]

Hi Mike,

Its been a long time since I've worked with any tape stuff (physical
or virtual) so I'm a bit rusty... what command are you running that
provides that error message (mtx maybe)? What does the output of
'lsscsi -g' look like and how about the contents of '/proc/scsi/scsi'?
I assume you're getting this error directly on the ESOS machine itself
before even attempting to share the tape device via the SAN.


--Marc

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[flovax]

When I was playing with lessfs, I was always having trouble keeping the lessfs mount point online on the ESOS storage.  Working with the lessfs config file help a lot by tuning some DB buffers.  Check your lessfs logs on ESOS and see for some errors.  Check if your mounts are still accessible on ESOS.

[michel...@gmail.com]

Hi Marc,
the error come directly from backup software which is hp data protector.
Now I'm isolating the problem on esos and I see that I cannot load a tape also with mtx command.

#lsscsi -g:
[0:0:0:0]    disk    HP       LOGICAL VOLUME   5.70  /dev/sda   /dev/sg1
[0:0:0:1]    disk    HP       LOGICAL VOLUME   5.70  /dev/sdb   /dev/sg2
[0:3:0:0]    storage HP       P410i            5.70  -          /dev/sg0
[1:0:0:0]    cd/dvd  hp       DVD A  DS8A8SH   KHE4  /dev/sr0   /dev/sg4
[7:0:0:0]    disk    Kingston DataTraveler G3  PMAP  /dev/sdc   /dev/sg3
[10:0:1:0]   mediumx HP       MSL3020 series   5500  -          /dev/sg7
[10:0:1:1]   tape    HP       Ultrium 4-SCSI   5500  /dev/st0   /dev/sg5
[10:0:1:2]   tape    HP       Ultrium 4-SCSI   5500  /dev/st1   /dev/sg6

# mtx -f /dev/sg7 load 1 0
Loading media from Storage Element 1 into drive 0...mtx: Request Sense: Long Report=yes
mtx: Request Sense: Valid Residual=yes
mtx: Request Sense: Error Code=70 (Current)
mtx: Request Sense: Sense Key=Hardware Error
mtx: Request Sense: FileMark=no
mtx: Request Sense: EOM=no
mtx: Request Sense: ILI=no
mtx: Request Sense: Residual = 00 00 00 00
mtx: Request Sense: Additional Sense Code = 04
mtx: Request Sense: Additional Sense Qualifier = 03
mtx: Request Sense: BPV=no
mtx: Request Sense: Error in CDB=no
mtx: Request Sense: SKSV=no
MOVE MEDIUM from Element Address 32 to 480 Failed

/proc/scsi/scsi
Host: scsi10 Channel: 00 Id: 01 Lun: 01
  Vendor: HP       Model: Ultrium 4-SCSI   Rev: 5500
  Type:   Sequential-Access                ANSI  SCSI revision: 02
Host: scsi10 Channel: 00 Id: 01 Lun: 02
  Vendor: HP       Model: Ultrium 4-SCSI   Rev: 5500
  Type:   Sequential-Access                ANSI  SCSI revision: 02
Host: scsi10 Channel: 00 Id: 01 Lun: 00
  Vendor: HP       Model: MSL3020 series   Rev: 5500
  Type:   Medium Changer                   ANSI  SCSI revision: 05

[Marc Smith]

Anything interesting in the kernel logs (/var/log/kern.log)? This may
be a question to pass up to the mhVTL dude... I looked on their
site/pages, but didn't see a mailing list. So might be worth
submitting a issue on his GitHub page -- hes pretty responsive.

--Marc

[michel...@gmail.com]

Thansk so mutch Marc.

Yes is pretty a problem of mhvtl device configuration, I found a device configuration that partially works.
I see only one drive and the backup starts but ends with message "cannot write to medium"... now should be a problem of lessfs.

Anyway I go on.

Thanks