Hi, ProtecTier on work over FC protocol but I have never heard that it require FC disk... When I meet with diligent people from Israel, I told them that we already have 7 TB of SATA that we which to "re-use", that would be no problem, they said.
They only support FC arrays today, but in that array you can have both FC and SATA drives. It feels strange creating a backup-to-disk solution that only support FC disks... The guy selling you ProtecTier, does he work at HDS and want you to buy a solution that includes expensive FC disks?? ;-) I think you need to find another source to Diligent, or perhaps I need to find one that tells me the truth.. :-) Hampus Lind Rikspolisstyrelsen National Police Board Tel dir: +46 (0)8 - 401 99 43 Tel mob: +46 (0)70 - 217 92 66 E-mail: [EMAIL PROTECTED] -----Ursprungligt meddelande----- Från: Paul Keating [mailto:[EMAIL PROTECTED] Skickat: den 15 september 2006 14:51 Till: Hampus Lind; [EMAIL PROTECTED]; [EMAIL PROTECTED] Kopia: veritas-bu@mailman.eng.auburn.edu Ämne: RE: [Veritas-bu] problems with VTL StorageTek solution ? I like the look of the ProtecTIER product. However, I've come up with some information that I can't get a hard answer on. The info I got from Diligent coonfused me even more. Everything I can find, and am told by either HDS, or Diligent says that Protectier requires FC disk.......as in, not SATA...... I find this confusing.....sure the data de-duplication technology requires knowing where the data is on disk, quickly, etc, etc. So I said to the Diligent rep I spoke with "Ok, so the de-duplication algorithm actually has to search the disk to find patterns?" to which I got the response (paraphrasing)"Oh no, of course not...all of the data on disk is mapped in RAM, we can map 1PB of disk in 4GB of RAM. The appliance doesn't need to read the disk to find hash matches, etc. All of that is done in RAM and only the unique data that needs to be written to disk is written to disk". So I asked why then would FC disk be necessary??? After pushing it a bit, I got a response that Yes, it would technically "work" with SATA disk, however there would be a performance hit due to SATA's transfer speed, of approx 40%, so they don't support SATA. So....here's my confusion....since the de-duplication is being done "in stream" on the appliance before the data ever gets to the disk array, then with the advertised 25:1 ratio, only 4% of the data hitting the box is getting written to disk. Even if the SATA disk is 80% slower that FC (being fascetious here), shouldn't it still be like 5 times faster than another product that writes "everything" to SATA disk? Yes all the other VTL vendors are basing their products on SATA (as Diligent is with their VTF Open product) Paul -- > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf > Of Hampus Lind > Sent: September 14, 2006 1:54 PM > To: [EMAIL PROTECTED]; [EMAIL PROTECTED] > Cc: veritas-bu@mailman.eng.auburn.edu > Subject: Re: [Veritas-bu] problems with VTL StorageTek solution ? > > > However, I have looked at both diligent and falconstor, and > for now I think > I would go with diligent.. What do you guys think?? > _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu