Nope, I may have experimented with it on a volume not in production
once, but I never tested backups in combination with it. The only
options I have enabled anywhere on volumes are nosnap, nosnapdir, and root.
Holloway, Chris wrote:
>
> I have seen the minra option on the volume have a major affect on
> backup speed. Have you got it set to minra=on on any of your volumes?
>
> Cheers
> Chris
>
>
> ----- Original Message -----
> From: owner-toasters@mathworks.com <owner-toasters@mathworks.com>
> To: Toasters <toasters@mathworks.com>
> Sent: Fri May 09 16:02:14 2008
> Subject: Max of 20MB/sec through FC attached LTO tape drive? Overland
> neo 2000
>
> Asking here because we don't have current Overland support for the fibre
> channel card and I would guess it is more of a problem with the card
> rather than netapp (we only used the FCO with a netapp), but maybe
> someone has encountered this...
>
> Around 2004 we bought a Overland Neo 2000 tape library with the FCO VIA
> scsi to FC converter board, and we got at most 20 or 25MB/sec through it
> (per tape drive) depending if we were writing or reading. This is both
> with NDMP dumps from the filer disks to tape, and also across the
> network into the filer to tape with NDMP. The backup software is
> Bakbone Netvault. Last year we tried attaching this library to a Unix
> host directly with SCSI and our speed almost doubled. I was floored,
> and shocked that we spent so many years missing out on performance,
> although 20-25 was the best I've seen anyone report for LTO2 so I never
> expected more.
>
> Recently we bought another Neo 2000 with LTO4 drives, and I decided to
> move the FCO card over to it and try again, hoping maybe there was a
> misconfiguration, but I could not find any and it still acts as if there
> is a mystery cap on the speed of 20MB/sec (it averages 18-19 after it
> gets going). I've been all through the configuration of the FCO card
> and it is set to 160M/sec per scsi bus, tried with and without domain
> validation, and I even got the FC channel to operate at 2Gbit but no
> improvement. If I cannot figure this out then I will just attach it to
> the Unix host with the other neo 2000, but its always nice to have more
> options. I would not bother operating a LTO4 drive at such a slow speed
> in production because shoe-shining would probably wear it out and the
> compression would be sub optimal or non-existent.
>
> ------------------------------------------------------------------------
> Christopher Holloway
> Lead Consultant
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This archive was generated by hypermail 2b29 : Fri May 09 2008 - 18:30:54 EDT