Phil,
The market offers many data deduplication technologies, most of which
run at the server level, may or may not dedupe the production data
set, and typically incur a performance penalty when enabled.
A-SIS runs on the array, deduplicates the prodcution data set, and
incurs minimal system overhead. in addition, de-duplicated data sets
can be replciated in their deduplicated state providing storage
savings on the prodcution and remote data sets.
As I know you are aware that with any technology one should should
follow best practices to ensure optimal results. I was about to ask
you about your business challenges, but I noticed that as your are
with EMC so I'd suspect that your business challenges aren't focused
on reducing storage costs.
Maybe we could find a customer who would like to compare the benefits
of A-SIS vs Avamar in a head to head evaluation where we could share
the results on toasters! Would you be interested in working together
to pull this off?
Vaughn Stewart
On 10/30/07, Fote_Philip@emc.com <Fote_Philip@emc.com> wrote:
> Just a general question on ASIS. How does it impact system
> performance?
> Is it enough so you need to plan around it?
>
> -----Original Message-----
> From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com]
> On Behalf Of Jack Lyons
> Sent: Monday, October 29, 2007 8:02 PM
> To: Glenn Walker
> Cc: M. Vaughn Stewart; Page, Jeremy; toasters@mathworks.com
> Subject: Re: A-SIS questions
>
> I agree that Vmotion and HA / DRS can handle most hardware issues, but
> there is an advantage to using MSCS. An application restart can happen
> in seconds or minutes. I can also force applications over to the other
> node to apply OS patches. We have several Virtual-Virtual clusters for
> test environment and several physical-virtual clusters for production.
>
> Jack
>
> Glenn Walker wrote:
> > I'm still trying to figure out why someone would use MSCS on ESX:
> >
> > MSCS is primarily used for HARDWARE-LEVEL fault tolerance (it won't
> help
> > if the application crashes, so much as if the hardware dies).
> >
> > VMotion can be used in place of MSCS for hardware-level fault
> tolerance,
> > IIRC, which negates the need for MSCS within a VM.
> >
> > -----Original Message-----
> > From: owner-toasters@mathworks.com
> [mailto:owner-toasters@mathworks.com]
> > On Behalf Of M. Vaughn Stewart
> > Sent: Saturday, October 27, 2007 5:08 PM
> > To: Jack Lyons
> > Cc: Page, Jeremy; toasters@mathworks.com
> > Subject: Re: A-SIS questions
> >
> > FlexClone will clone a datastore, for VM level cloning granularity you
>
> > gonna have to wait I think something is just around the corner.
> >
> > As for MSCS you need RDMs as VMDKs are not supported with MSCS
> >
> > RDMs can be either FCP or iSCSI
> > VMDKs can be on NFS or VMFS (which is over FCP or iSCSI)
> >
> >
> >
> >> We are in the process of testing ESX on NFS. We have 2 out of 60 on
> >> NFS now. I just started thinking about using flexclones, is any one
> >> using flex clones with NFS for creating clones of VM's.
> >>
> >> Also, from what I have read, to use MSCS I need to use an RDM from
> >> iscsi or FC luns...correct?
> >>
> >> Thanks
> >> Jack
> >>
> >> M. Vaughn Stewart wrote:
> >>
> >>> Jeremy,
> >>>
> >>> A-SIS has a slight write performance penalty (a few points) and
> >>> typically also sees a slight read performance gain (of the same
> >>> amount), so in short customers who are using it love it. Now you
> >>> don't use it everywhere, like on DB files.
> >>>
> >>> As for VMware on NFS, enjoy your solution it rocks, don't take my
> >>> word for it. Google VMware on NFS and sort by date, you'll have
> >>> allot of reading to do. Quotes from executives at EMC and VMware
> >>> just support what you are deploying. Make sure to see NetApp's
> >>> TR3428 for deployment details.
> >>>
> >>> See ya
> >>> Vaughn
> >>>
> >>>
> >>>> I have read some of the info on how A-SIS works but I have a couple
>
> >>>> of questions:
> >>>> 1) Assuming an average compression rate (say /home with random
> docs
> >>>>
> >
> >
> >>>> in it) how much of a performance hit does it impose
> >>>> 2) Does it change how much data is sent over the wire when you use
> >>>> SnapMirror/SnapVault? I.e. if I get 30% compression on a 1 gig
> >>>> snapshot do I send 1 gig or 700 mb to update my target?
> >>>>
> >>>> Oh, and for the folks who helped earlier, we are moving our Oracle
> >>>> and ESX systems to NetApp, the pSeries will be fibre connected, at
> >>>> least at first but the ESX stuff is all going on NFS.
> >>>>
> >>>> ~Jeremy
> >>>> *__*
> >>>> This message (including any attachments) contains confidential
> >>>> and/or proprietary information intended only for the addressee.
> >>>> Any unauthorized disclosure, copying, distribution or reliance on
> >>>> the contents of this information is strictly prohibited and may
> >>>> constitute a violation of law. If you are not the intended
> >>>> recipient, please notify the sender immediately by responding to
> >>>> this e-mail, and delete the message from your system. If you
> >>>> have any questions about this e-mail please notify the sender
> >>>> immediately.
> >>>>
> >>>>
> >>>
> >>
> >
> >
> >
>
>
>
--
Vaughn Stewart