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SCAN host

Created: 24 Dec 2012 • Updated: 25 Dec 2012 | 9 comments
This issue has been solved. See solution.

http://www.symantec.com/business/support/index?pag...

 

Hi Friends,

I have some querries regarding SCAN host.I have read the manuals and the above link.But i have some doubts.

  1. Scan host can change if it is down?
  2. Scan host and drive owner for Shared drive are same?
  3. Scan host is permanent for a drive throughout?
  4. Role of SCAN host?

Comments 9 CommentsJump to latest comment

RamNagalla's picture

 

  1. Scan host can change if it is down?

yes, EMM server automatically will chage this.

 

2 Scan host and drive owner for Shared drive are same?

if you mean device host, both are different.. 

 

3 Scan host is permanent for a drive throughout?

 

no, it can change... 

 

4 Role of SCAN host?

scans unassigned drives and update the status to EMM server.

nike_new's picture

1.Rule for changing?

3.Change is for temporary basis?

2.media server which has been assigned the drive and that drive scan host are same?

RamNagalla's picture

 

1.Rule for changing?  

 

A scan host is assigned for a shared drive until some interruption occurs.

For example, if one of the following occurs, EMM chooses a new scan host:

  • The socket connection, the host, the drive, the drive path, or the network goes down.

  • The drive is logically placed in the Down mode.

The scan host temporarily changes to hosts that request tape mounts while the mount is in progress. Scan host changes occur so only one host at a time has access to the drive path.

3.Change is for temporary basis?

The scan host temporarily changes to hosts that request tape mounts while the mount is in progress. Scan host changes occur so only one host at a time has access to the drive path

2.media server which has been assigned the drive and that drive scan host are same?

i belive that is not mandatory... 

 

 

Marianne's picture

You will probably remember these posts, right?

https://www-secure.symantec.com/connect/forums/scan-hosts 

https://www-secure.symantec.com/connect/forums/shared-drive 

Supporting Storage Foundation and VCS on Unix and Windows as well as NetBackup on Unix and Windows
Handy NBU Links

Arun K's picture

@Nagalla:Many thanks for ur concern.

Just last querry:

When EMM changes the SCAN host,And after the backup completion,SCAN host remains the same?

Arun K's picture

 

-bash-3.2$ sudo ./vmdareq
 
Drive002 - AVAILABLE
     LXMC74 SCAN_HOST UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
Drive003 - AVAILABLE
     LXMC74 SCAN_HOST UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
LN-DRV01 - RESERVED on Mon 08 Oct 2012 01:46:59 PM EDT
     LXMC72 SCAN_HOST UP
     LXMC74 UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 RESERVED UP
     LXMC79 UP
LN-DRV02 - AVAILABLE
     LXMC74 SCAN_HOST UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
LN-DRV03 - RESERVED on Mon 08 Oct 2012 02:47:36 PM EDT
     LXMC74 RESERVED SCAN_HOST UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
LN-DRV04 - AVAILABLE
     LXMC74 SCAN_HOST UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
LN-DRV05 - RESERVED on Sat 06 Oct 2012 07:16:48 AM EDT
     LXMC72 UP
     LXMC74 SCAN_HOST UP
     LXMC75 RESERVED UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
LN-DRV06 - RESERVED on Mon 08 Oct 2012 02:47:36 PM EDT
     LXMC74 RESERVED SCAN_HOST UP
     LXMC75 UP
     WNMC876 UP
     WNMC877 UP
     LX2MC68 UP
     LX2MC69 UP
     LXMC78 UP
     LXMC79 UP
 
Below is the output in my environment.What below means:
  1.     LXMC74 SCAN_HOST UP
         LXMC75 RESERVED UP
  2. RESERVED SCAN_HOST UP
  3. RESERVED UP
  4. SCAN_HOST UP
 
 
RamNagalla's picture

for Drive LN-DRV05

scan host is LXMC74 and its allocated to LXMC75 for job.

Drive LN-DRV03.

both scan host and allocated to LXMC74

Drive LN-DRV01

is allocated to  LXMC78 and the scan host is LXMC72

the allocations chage based on the Drive requests for jobs..

and the scan host are to scan unassign drives.. .its selected by emm server based on avaliablity.

 

 

nike_new's picture

so scan host changes with each job?

RamNagalla's picture

The scan host temporarily changes to hosts that request tape mounts while the mount is in progress. Scan host changes occur so only one host at a time has access to the drive path.

this will answer your question. from the like that you posted..

 

i am just querious... do you have any issue with scan host?

why dont you leave this scan host management to EMM server?

plesase read and understand the  below guide.. 

http://www.symantec.com/business/support/index?pag...

SOLUTION