On Thursday 30 April 2009, Huebner,Andy,FORT WORTH,IT wrote: > 1 Gb Ethernet is about 100Mb/sec Maybe nick picking, but for me: 100Mb = 100 Mbit, 100MB is 100 MByte.
> LTO4 is about 120Mb/sec + compression Mhh, I was counting 80 MB/s up to 160 MB/s with compression ratio 2:1. > A good SCSI or FC drive is good for about 100Mb/sec The disk storage fot the client is an n Series from IBM (16 TB), but also 12 TB local (scsi attached) disks. > Assuming you can stream 3 threads across the Ethernet, you will not be able > to keep the 3 LTO4 drives busy because of the network. The faster tape > drives were not intended to take data from the Ethernet. Assuming some sort > of RAID and careful selection of file system backup times the disk can keep > up with the network if the read is sequential and the backup software can > find the data fast enough. Make sure you have multiple busses. Basically I > would look for a PCI-Express system with enough slots for the Ethernet and > RAID or HBA controllers. > > I would be stressed about making the window and since you are using a > traditional backup solution the fulls will be tough. The customer was counting on a 24hr or even a 48hr backup window on saterday and sunday. And for the stress, this is solution is pushed from the head quarters in America to the customer in Belgium. They wanted a DS48 from IBM + TSM.... Thanx for the info. Stef
