I have not really played with disk-staging with the DDRs; however, I
have used disk staging under 5.1MP4 and 6.0MP2/3, and suffice to say,
its not great.
I have spoken to the 'important' folks at Symantec and they have plans
to multi-stream off disk to tape from a disk staging unit, when this
happens, it should be good. However, staging off a fast RAID10 or
RAID5 only gave 30-35MB/s when bleeding off to tape.
Justin.
On 4/3/07, Brandon Zermeno <Brandon.Zermeno at pulte.com> wrote:
> Do you do any migration of the data to tape? If you are how is that
> working?
>
> -----Original Message-----
> From: veritas-bu-bounces at mailman.eng.auburn.edu
> [mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Justin
> Piszcz
> Sent: Tuesday, April 03, 2007 4:58 AM
> To: Tom Burrell
> Cc: Veritas-bu at mailman.eng.auburn.edu
> Subject: Re: [Veritas-bu] DataDomain and Netbackup
>
> Comments are below:
>
> On Mon, 2 Apr 2007, Tom Burrell wrote:
>
> > Where do I start?
> >
> > What kind of compression do you see?
> The compression is really strange, these rates are based upon 100-200GB
> of
> actual data from a Windows server, but it only shows up as 30GB or so:
>
> ddr# df -h
> Resource Size GB Used GB Avail GB Use%
> ------------------- ------- ------- -------- ----
> /ddvar 29.5 0.8 27.2 3%
> Pre-compression - 448.6 - -
> Data 3857.6 11.4 3846.1 0%
> If 100% cleaned* 3857.6 11.4 3846.1 0%
> Meta-data 19.4 0.0 18.3 0%
> Index 181.5 3.9 177.6 2%
> ------------------- ------- ------- -------- ----
> Estimated compression factor*: 29.2x = 448.6/(11.4+0.0+3.9)
> * Estimate based on 2007/04/03 cleaning
> ddr#
>
>
> >
> > How does the performance compare to tape/other disk in
> > your environment?
> The DDR units we have are older models, they use some sort of
> proprietary
> RAID-6 technology so if you run one stream you will see 20-30MB/s but if
>
> you run more than one, well, you will see 5-8MB/s on each stream.
>
> >
> > Are you using an appliance, or a gateway unit? If a
> > gateway, what do you have behind it for disk?
> I am using an DDR unit for disk backups, it has several disks and cost a
>
> bunch :)
>
> >
> > Do you replicate between units? DR or Remote Office
> > backup?
> You can, but it won't help with NetBackup catalogs :)
>
> ddr# help replication
>
> NAME
> replication - Manage the Replicator for replication of data from
> one
> restorer to another.
>
> SYNOPSIS
> replication add source <hostname> destination <destination>
>
> replication break <destination>
>
> I currently do not use replication.
>
> >
> > How does the replication do on bandwidth?
> I believe it only rsyncs the blocks that have changed every 5 minutes if
> I
> remember correctly(?)
>
> >
> > How has the support experience been for you? How is
> > the reliability in your opinion?
> We do not POUND the DDR units to the ground; but, overall they are nice
> to
> have to use as DSU's to backup hosts with many files or slow links, that
>
> way it saves our tapes from shoe shining.
>
> Justin.
>
> >
> > That should start you off. I'll stop and take a
> > breath now.
> >
> > Tom Burrell
> >
> > --- Justin Piszcz <jpiszcz at lucidpixels.com> wrote:
> >
> >> I use DDR units on a daily basis and have tested
> >> their VTL option, what
> >> are your questions?
> >>
> >> On Mon, 2 Apr 2007, Tom Burrell wrote:
> >>
> >>> Anyone out there have some experiences they would
> >> like
> >>> to share using DataDomain appliances as Disk
> >>> Storage/Staging units behind Netbackup? Esp. in a
> >> DR
> >>> scenario (replicating between sites)?
> >>>
> >>> We are considering a number of options, and at
> >> least
> >>> on paper this one looks pretty interesting and I'm
> >>> hearing good anecdotal evidence locally. Plans
> >> are
> >>> being formed for a proof-of-concept on this, but I
> >> was
> >>> wondering if anyone else has tried this route
> >>> recently.
> >>>
> >>> Tom Burrell
> >>>
> >>>
> >>>
> >>>
> >>
> >
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> >>
> >
> >
> >
> >
> >
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