I have a customer with a 7510, it has worked flawlessly and is VERY easy to 
implement.
I have 2 other customers with non-IBM VTL's that have run into some 
configuration and throughput issues.
All VTL's have different capabilities and different throughput characteristics 
- you have to match yours to your throughput expectations.
 
I have not yet touched a 7520 in the wild, but as far as I can tell, it's 
terrific.
 
IBM took the 7510 and fixed all its limitations (which weren't out of line with 
other vendors to start with).  The 7520 has more fibre connections & path 
failover, which the 7510 did not.  It will scale up to 800 TB (yep that's with 
a T), which many (most) of the VTL's on the market will not.
 
An ordinary 2-engine 7520 will support a total throughput rate of 2400 MB/sec.  
A 4-engine config will support up to 4800 MB/sec (yep thats 
four-eight-zero-zero) MB/sec.
 
Looks to me like it's the biggest, baddest, boy on the block now as far as 
VTL's go.
What's not to like?!?
 
Just my opinion.
Wanda (no I don't sell hardware, I just like TSM to fly...) Prather
 
 


________________________________

From: ADSM: Dist Stor Manager on behalf of David E Ehresman
Sent: Wed 6/6/2007 9:10 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: IBM TS7520 VTL



Anyone looking at the new IBM TS7520 VTL?  What do you think?