[Veritas-bu] Dual port HBA - 1 port disk, 1 port tape...good or bad?
2005-07-27 15:06:43
What's a good way around this???
Cheap appliance type Media servers? Like V210s with a couple of HBAs to
interface to banks of tape drives.
4x LTO2 or 2x LTO3 or something per V210 with a dual port 2gb HBA
I currently have 8 LTO2 drives on two 2gb HBAs, in a v880 with dual gigE
cards.
However, I know my bottleneck is the 2gb DWDM link between my sites (4
tapes in a library on each side of the DWDM link)
Writing two tape at a time, using ITC.
Paul
> -----Original Message-----
> From: veritas-bu-admin AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of
> Charles Ballowe
> Sent: July 27, 2005 2:46 PM
> To: Veritas List
> Subject: Re: [Veritas-bu] Dual port HBA - 1 port disk, 1 port
> tape...good or bad?
>
>
> keep in mind that the bandwidth limits on a 32 bit, 33Mhz PCI bus are
> 132 MB/sec. That's the biggest limit I run into in my backup
> environment, and someone else mentioned it. That's the agregate for
> all devices on the bus. If you have a network card and modern tape
> technology, you can pretty much max out that bus bandwidth with just
> the network reads and tape writes. On one of my media servers, I'm
> quite happy if I get 40MB/sec in from the network and write (inline
> tape copy) that out to 2 tape drives. That's pushing the bus at
> 120MB/sec.
>
> -Charlie
>
> On 7/27/05, Jack L. Forester, Jr. <jack.l.forester AT lmco DOT com> wrote:
> > I may be getting some new HBAs to put into my master servers. They
> > would be dual port cards. Presently, my tape devices are
> on an older
> > JNI HBA which requires me to reboot the server (Sun E450) to add
> > devices. As an additional bonus, the new HBAs would be 2Gb
> with the old
> > ones 1Gb. I'm considering moving the tapes to the new HBA.
> However,
> > the main reason we are going to get the HBAs is to attach to our
> > enterprise SAN for disk storage.
> >
> > Now, to get to my point, I'm aware that it's usually
> considered bad form
> > to put tape and disk on the same port of an HBA. What
> about tape and
> > disk on different ports of the same HBA? I would guess
> that if the card
> > has sufficient bandwidth and the ports are truly independent of each
> > other (not sharing any settings) that this configuration
> would be OK.
> >
> > Any thoughts?
> >
> > --
> > Jack L. Forester, Jr.
> > UNIX Systems Administrator, Stf
> > Lockheed Martin Information Technology
> > (304) 625-3946
> >
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
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> >
>
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