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VTL licensing was based upon the number of drives, and has or will
transition to capacity of the library.
DSSU is a freebie included in NetBackup 5.x+.
Shyam Hazari wrote:
> How does the veritas licensing works for DSSU and VTL ? As far as I
> know, VTL is based on capacity. Is their a licensing requirement for
> DSSU as well ?
>
> TIA
>
> -Shyam
>
>
> On 4/27/06, *Matthew Stier* <Matthew.Stier AT us.fujitsu DOT com
> <mailto:Matthew.Stier AT us.fujitsu DOT com>> wrote:
>
> With the recording speeds of todays tape drives, you have to put some
> kind of disk in front of them, to ensure you have a steady stream of
> data to record. Without it, your just going to wear out the drives,
> even faster than before. And no matter how fast tape drives get, they
> will never match the throughput of disk, and thus never match them, in
> reducing backup windows.
>
> I recently (January) replaced a six drive DLT7000 library with an
> Overland Storage NEO8000/REO9000 combination. The performance
> difference is dramatic. And with plenty of disk, in the second "D" in
> "D2D2T" the wear on the tape drives have been drastically reduced. It
> has taken 4 months to reach the 100 hours "milestone" of per-drive
> wear.
> Something I did on a weekly basis with the DLT7000's.
>
> I originally looked at the REO9000 with the intent to use it as a VTL,
> but (NetBackup) licensing costs, and the virtual media overhead I
> encountered, in that mode, I chose to simply slice it up onto 1 TB
> partitions, mount them on my media server (Sun Enterprise 450 running
> Solaris 8) and use them as Disk Storage Staging Units (DSSU).
>
> VTL's do have their strengths. Nearly a unlimited number of virtual
> drives; and by using smaller virtual media; a high flexibility in the
> allocation of disk amongst numerous policies. They are nearly the
> only
> solution in situations, where the disk staging on the media server is
> not an option. Many VTL manufacturers are also PTL manufactures, and
> often tightly couple their offering. Even to the point of staging data
> from disk to tape, outside the scope of the backup software.
>
> DSSU's do have their weaknesses. You are typically stuck with
> one-to-one
> ration between DSSU's and policies. This fit my needs, but for those
> with a multitude of policies to manage, I can see them having
> problems.
>
> Steven L. Sesar wrote:
> > We're in the process of rearchitecting our BUR infrastructure. The
> > most profound change will be the addition of disk storage, as we
> are
> > 100% tape, right now. We're considering a few different disk
> > technologies, such as VTL, DataDomain NAS heads, as well as
> > traditional DSU/DSSUs.
> >
> > I've heard anecdotal evidence that DSU/DSSU functionality in NBU 5.1
> > is less-than-stellar. Would anyone care to share their overall
> > experience with disk storage?
> >
> > Thanks,
> >
> > Steve
> >
> >
> >
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> <mailto:Veritas-bu AT mailman.eng.auburn DOT edu>
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> <http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu>
>
>
>
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VTL licensing was based upon the number of drives, and has or will
transition to capacity of the library.<br>
<br>
DSSU is a freebie included in NetBackup 5.x+.<br>
<br>
Shyam Hazari wrote:
<blockquote
cite="mid272b4fbb0604280607j5624df28t27b80bf1812a297 AT mail.gmail DOT com"
type="cite">
<div>How does the veritas licensing works for DSSU and VTL ? As far
as I know, VTL is based on capacity. Is their a licensing requirement
for DSSU as well ?</div>
<div> </div>
<div>TIA</div>
<div> </div>
<div>-Shyam<br>
<br>
</div>
<div><span class="gmail_quote">On 4/27/06, <b
class="gmail_sendername">Matthew Stier</b> <<a
href="mailto:Matthew.Stier AT us.fujitsu DOT com">Matthew.Stier AT us.fujitsu
DOT com</a>>
wrote:</span>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex;
padding-left: 1ex;">With
the recording speeds of todays tape drives, you have to put some<br>
kind of disk in front of them, to ensure you have a steady stream of
<br>
data to record. Without it, your just going to wear out the
drives,<br>
even faster than before. And no matter how fast tape drives get,
they<br>
will never match the throughput of disk, and thus never match them, in<br>
reducing backup windows.<br>
<br>
I recently (January) replaced a six drive DLT7000 library with an<br>
Overland Storage NEO8000/REO9000 combination. The performance<br>
difference is dramatic. And with plenty of disk, in the second "D" in
<br>
"D2D2T" the wear on the tape drives have been drastically reduced. It<br>
has taken 4 months to reach the 100 hours "milestone" of per-drive wear.<br>
Something I did on a weekly basis with the DLT7000's.
<br>
<br>
I originally looked at the REO9000 with the intent to use it as a VTL,<br>
but (NetBackup) licensing costs, and the virtual media overhead I<br>
encountered, in that mode, I chose to simply slice it up onto 1 TB<br>
partitions, mount them on my media server (Sun Enterprise 450 running<br>
Solaris 8) and use them as Disk Storage Staging Units (DSSU).<br>
<br>
VTL's do have their strengths. Nearly a unlimited number of
virtual<br>
drives; and by using smaller virtual media; a high flexibility in the
<br>
allocation of disk amongst numerous policies. They are nearly the
only<br>
solution in situations, where the disk staging on the media server is<br>
not an option. Many VTL manufacturers are also PTL manufactures, and<br>
often tightly couple their offering. Even to the point of staging data<br>
from disk to tape, outside the scope of the backup software.<br>
<br>
DSSU's do have their weaknesses. You are typically stuck with one-to-one<br>
ration between DSSU's and policies. This fit my needs, but for those
<br>
with a multitude of policies to manage, I can see them having problems.<br>
<br>
Steven L. Sesar wrote:<br>
> We're in the process of rearchitecting our BUR infrastructure. The<br>
> most profound change will be the addition of disk storage, as we
are
<br>
> 100% tape, right now. We're considering a few different disk<br>
> technologies, such as VTL, DataDomain NAS heads, as well as<br>
> traditional DSU/DSSUs.<br>
><br>
> I've heard anecdotal evidence that DSU/DSSU functionality in NBU
5.1<br>
> is less-than-stellar. Would anyone care to share their overall<br>
> experience with disk storage?<br>
><br>
> Thanks,<br>
><br>
> Steve<br>
><br>
><br>
><br>
> _______________________________________________
<br>
> Veritas-bu maillist - <a
href="mailto:Veritas-bu AT mailman.eng.auburn DOT edu">Veritas-bu AT
mailman.eng.auburn DOT edu</a><br>
> <a
href="http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu";>http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
</a><br>
<br>
<br>
</blockquote>
</div>
<br>
</blockquote>
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