Another thought: You really want to avoid the LTO4 drives dropping out of streaming mode, even if 1Gb/s is enough bandwidth to theoretically move the amount of data you need to move. I believe LTO4 will operate down to 30-40MB/s. Worth checking, since I'm not sure, but I'm pretty sure you can drop as low as 40MB/s and still stay in streaming mode. Once you drop out of streaming mode, your throughput will go in the dumper, and you won't get anything close to 1Gb/s throughput.
At 10:15 AM 2/12/2013, Michael Roesch wrote: >Hi Stefan, > >one quick question: what are the numbers you are using for your >calculation? > >Did you convert 240 MB/s into Gigabit/s? > >Thanks > >Regards, >Michael > > > >On Tue, Feb 12, 2013 at 1:01 PM, Stefan Folkerts ><[email protected]>wrote: > >> Yes, two LTO4 drives would not be happy at all behind a 1Gb/s HBA, even two >> 1Gb/s HBA's are not enough to fully utilize the drives. >> I would imagine you could also run into driver/firmware issues with this >> combination since it's a very strange one but then again....it would >> probably work just slow. >> >> >> On Tue, Feb 12, 2013 at 12:34 PM, Michael Roesch >> <[email protected]>wrote: >> >> > Hi Stefan, >> > >> > the drives are LTO4 ones. So the HBA would be the bottleneck >> > >> > >> > On Tue, Feb 12, 2013 at 11:36 AM, Stefan Folkerts < >> > [email protected] >> > > wrote: >> > >> > > If it is LTO1 or LTO2 you would be OK, if it is LTO3 or higher you are >> > > limiting your drivers with your HBA. >> > > >> > > >> > > On Tue, Feb 12, 2013 at 10:39 AM, Michael Roesch >> > > <[email protected]>wrote: >> > > >> > > > Hi all, >> > > > >> > > > we have an old HP MSL 6030 with two drives that share one 1 GBit FC >> > port. >> > > > Would that be enough to use with TSM? I have a feeling that says "no" >> > > but I >> > > > couldn't find any minimum FC requirements. >> > > > Anyone having more info? Maybe even an IBM technote? >> > > > >> > > > Thanks >> > > > >> > > > Regards, >> > > > Michael Roesch >> > > > >> > > >> > >> -- Paul Zarnowski Ph: 607-255-4757 CIT Infrastructure / Storage Services Fx: 607-255-8521 719 Rhodes Hall, Ithaca, NY 14853-3801 Em: [email protected]
