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What do you mean RESET PATH / MISSING PATH ERROR

Ewe
Level 3

Hello, 

I've some issue with my library especially with a drive. 

I don't understand why I'm loose a path on onen drive. The others still working correctly. 

By consequently a tape still lock in the drive, anymore backup can run on this drive.

For the solve this issue i need to delete all path then delete the drive, restart the drive on library  and configure again the librairy.

That is painful because i need stop netbackup services

 

So I would know if you have already meet this issue. How you have solved that?
What do you mean RESET PATH > on drives tabs ?

 

1 ACCEPTED SOLUTION

Accepted Solutions

Nicolai
Moderator
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You are correct, if OS cannot see the tape drive, no device driver path are created.

Once you get a change to talk to the FC admin, ask him to check if he/she can see 5 drives in SAN fabric. If yes, check SAN zoning include all 5 drives.

Depending on FC HBA vendor, each company provide low level utilities that let you see, what the FC card can see, without going through the OS layer. For Qlogic card, this utility is called SANSurfer. It won't repair anything, but it will help you in troubleshooting the issue, by providing certainty about drive being visible to the host or not.

View solution in original post

6 REPLIES 6

Nicolai
Moderator
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Partner    VIP   

From the screen dump provided, it looks like either the tape drive drop off the fibre channel bus. A device driver point to a tape drive, if either the tape drive drop off because of FC issues, or a non existing path is used, you will get MISSING_PATH. That is Netbackup way of saying "the path to the tape drive is missing".

My advice:

Check the scan command in /usr/openv/volmgr/scan before configuring tape devices. Does the command show the tape devices you expect ?

Consider to call in hardware vendor

Check relevant log for Fibre Channel issues or SCSI sense to narrow down issue.

Thank you for your feedback

On the header we can see the 4 drives

It seems that the drive 4 is more visible, there are anymore path. 

We can check the information somewhere? We can make log?
I can do something for uplink this drive ?

scan
************************************************************
*********************** SDT_TAPE ************************
*********************** SDT_CHANGER ************************
************************************************************
------------------------------------------------------------
Device Name : "/dev/sg10"
Passthru Name: "/dev/sg10"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP MSL6480 5.70"
Vendor ID : "HP "
Product ID : "MSL6480 "
Product Rev: "5.70"
Serial Number: "DEC451067F_LL02"
WWN : ""
WWN Id Type : 0
Device Identifier: "HP MSL6480 DEC451067F_LL02"
Device Type : SDT_CHANGER
NetBackup Robot Type: 8
Removable : Yes
Device Supports: SCSI-5
Number of Drives : 5
Number of Slots : 70
Number of Media Access Ports: 10
Drive 1 Serial Number : "8026DD210D"
Drive 2 Serial Number : "8026DD2117"
Drive 3 Serial Number : "8026DD2121"
Drive 4 Serial Number : "8026DD212B"
Drive 5 Serial Number : "8026DD213F"
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/tape/by-path/pci-0000:24:00.0-fc-0x5001438026dd210e-lun-0-n st"
Passthru Name: "/dev/sg9"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 6-SCSI 25MW"
Vendor ID : "HP "
Product ID : "Ultrium 6-SCSI "
Product Rev: "25MW"
Serial Number: "8026DD210D"
WWN : ""
WWN Id Type : 0
Device Identifier: ""
Device Type : SDT_TAPE
NetBackup Drive Type: 16
Removable : Yes
Device Supports: SCSI-6
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/tape/by-path/pci-0000:24:00.1-fc-0x5001438026dd2118-lun-0-n st"
Passthru Name: "/dev/sg3"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 6-SCSI 25MW"
Vendor ID : "HP "
Product ID : "Ultrium 6-SCSI "
Product Rev: "25MW"
Serial Number: "8026DD2117"
WWN : ""
WWN Id Type : 0
Device Identifier: ""
Device Type : SDT_TAPE
NetBackup Drive Type: 16
Removable : Yes
Device Supports: SCSI-6
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/tape/by-path/pci-0000:24:00.1-fc-0x5001438026dd2140-lun-0-n st"
Passthru Name: "/dev/sg5"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 6-SCSI 25GW"
Vendor ID : "HP "
Product ID : "Ultrium 6-SCSI "
Product Rev: "25GW"
Serial Number: "8026DD213F"
WWN : ""
WWN Id Type : 0
Device Identifier: ""
Device Type : SDT_TAPE
NetBackup Drive Type: 16
Removable : Yes
Device Supports: SCSI-6
Flags : 0x0
Reason: 0x0
------------------------------------------------------------
Device Name : "/dev/tape/by-path/pci-0000:24:00.0-fc-0x5001438026dd2122-lun-0-n st"
Passthru Name: "/dev/sg8"
Volume Header: ""
Port: -1; Bus: -1; Target: -1; LUN: -1
Inquiry : "HP Ultrium 6-SCSI 25GW"
Vendor ID : "HP "
Product ID : "Ultrium 6-SCSI "
Product Rev: "25GW"
Serial Number: "8026DD2121"
WWN : ""
WWN Id Type : 0
Device Identifier: ""
Device Type : SDT_TAPE
NetBackup Drive Type: 16
Removable : Yes
Device Supports: SCSI-6
Flags : 0x0
Reason: 0x0

 

 

Nicolai
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OK - Robot can see 5 drives, but OS can only access 4 drives.

Drive 4 with serial nimber "8026DD212B" isn't listed.

Check:

Hardware (tape drive is powered on, OK seen from the robot)
Configuration of the tape library - no partitions or like.

If connected by fibre channel:
Fibre Channel Name server can see all 5 drives
Verify zonning is correct (my guess the fault is here)

/Nicolai

Ok thank you, 

From web interface of my library it looks good. The drive is up and running. 
I'll contact HP support to send the robot logs. Maybe they'll see something.

I'm looking for the path "/dev/tape/by-path/pci-0000..." of this missing drive in media server but there are nothing. This path doesn't exist.

By consequently, i suppose my system doesn't see the drive. That explain why Netbackup can't turn up the path  

In /var/log/message or dmesg i don't see anything, no error.  

Do you think I can check something on the other side of the system?

About FC configuration I need ask teaming who manage that

 

Nicolai
Moderator
Moderator
Partner    VIP   

You are correct, if OS cannot see the tape drive, no device driver path are created.

Once you get a change to talk to the FC admin, ask him to check if he/she can see 5 drives in SAN fabric. If yes, check SAN zoning include all 5 drives.

Depending on FC HBA vendor, each company provide low level utilities that let you see, what the FC card can see, without going through the OS layer. For Qlogic card, this utility is called SANSurfer. It won't repair anything, but it will help you in troubleshooting the issue, by providing certainty about drive being visible to the host or not.

I'm sorry for the delay

So we didn't find the root cause but after rescan command line on linux system. The drive are visible on my system.
From Netbackup GUI I've delete the path and the faulted drive. And I again configured the drive.

Thank you for you help