Curtis Preston wrote:
> Steven L. Sesar said:
>
>   
>> The way that CommVault does it with Gridstor is that each media server 
>> shares an index cache (the equivalent of NBU's catalog/databases) via 
>> NFS or CIFS. I call it a "poor man's clustered filesystem". It affords 
>> one the luxury of pooling media servers, such that if one goes down,
>>     
> any 
>   
>> other can take over in it's place. Since the index cache is shared, the
>>     
>
>   
>> job just picks up where it left off. It also allow one to load balance 
>> among media servers. 
>>     
>
> NBU's index is already centralized at the master (and therefore shared
> amongst media server), so media servers can take over for other media
> servers any time.
>   

Really? They will automatically failover/load balance? Something new in 
6.x? How are the media servers logically grouped? Is this now a function 
of STU groups? (pssst! I'm the guy who asked you the question at SNW 
about email archiving's potential impact on de-duplication - still 
haven't gotten a good answer on that one)

>   
>> The same goes for disk storage targets. If disk 
>> storage unit "A" becomes unavailable for any reason, disk STU "B" can
>>     
> be 
>   
>> configured to take over in it's place. Massive job and component
>>     
> resiliency!
>
> This is where CommVault shines.  They can share a disk device on the SAN
> where NBU can't (yet), and backups can span disk devices where NBU can't
> (yet).  NBU 6.5 (due next month) is supposed to have both of these.
>   


-- 
===================================

   Steven L. Sesar
   Lead Operating Systems Programmer/Analyst
   UNIX Application Services R101
   The MITRE Corporation
   202 Burlington Road - MS K101
   Bedford, MA 01730
   tel: (781) 271-7702
   fax: (781) 271-2600
   mobile: (617) 519-8933
   email: ssesar at mitre.org

=================================== 

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