Hey,

Are you really hoping to write at 64-72MB/sec? We've got an M1500 with 2 
SDLT320 drives on a dual AMD MP2000+ Linux box (before, we had an L1000 with 
2 DLT7000 drives, similar setup than yours) and performance looks like the 
following:

Remote Oracle over gigether: 22MB/s (backup performance, not wire speed).
Remove fileserver over gigether: 10MB/s (with an even spread of small/large 
files)

CPU usage is a maximum of 40% at all time (according to MRTG). I guess it's 
slightly more busy since it's driving a gigether NIC. Nonetheless, no need 
for a huge amount of CPU power.

Your milage may vary here: are you running backups over 100MB ether? Over a 
SAN? Direct from SCSI? What are your files like (if seen *huge* differences 
between backing up a single 2 gig file vs. 2 gigs of 1k files.).

I don't think it's necessary to run that on 2 servers. Your existing jukebox 
isn't exactly going to affect the machine too much. I don't assume it's 
necessary to mention that you don't want to run your Ultra160 SDLTs on the 
same bus as your ??Ultra40?? DLTs since this will throttle everything to 
??Ultra40?? Make sure you have a gig of RAM, dual "decent" CPUs, and that'll 
be enough.

My knowledge of SCSI/Netbackup is very limited (I'm sure others can be more 
detailed). This is just "experience" from my current setup.

Hopefully this is of some help. 

-- 
===================================================================
Mathieu Nantel - RHCE,CCNA                       Ecopia BioSciences
Systems Manager                                 (514) 336-2724 x434
nantel AT ecopiabio DOT com
===================================================================
[*] Please avoid sending me Word/Excel/PowerPoint attachments.
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On Wednesday February 11 2004 17:12, Adam Porter wrote:
> We've outgrown our Sun StorEdge L40 with 2 DLT7000 drives and 40 slots.
>    Our Netbackup Datacenter server is also old and failing.  We will be
> upgrading NBU 3.4.1 to 5.0, adding a 2-drive SDLT jukebox (keeping the
> old jukebox too) and replacing the server.
>
> Originally, I thought we might buy 2 servers (possibly Linux-based dual
> Xeons), one to drive each jukebox.  But Veritas licensing structure &
> costs may make this expensive.
>
> Our existing jukebox can write at 10MB/sec with both drives spinning.
> The new jukebox will hopefully write at 64-72MB/sec with both drives
> spinning.
>
> If I sufficiently beef up a single server with dual-channel SCSI (i.e.
> Adaptec 39160) and extra RAM, could I use a single server to drive both
> jukeboxes?  This should be cheaper (I could use my existing single
> server license) and simpler to manage, but I don't want performance to
> suffer and I'm assuming the 160MB/sec SCSI connection won't be a
> bottleneck.  (This also assumes we'll be able to implement a gigabit
> backup LAN that performs fast enough to push both jukeboxes.)
>
> Thanks in advance,
>
> -Adam
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