The IBM DS400 SAN attached storage array is no longer available so I must decide on a replacement, the kit must be IBM so no telling me to buy NetApps or EMC.
The replacement system will start with 14 * 147GB disks plus dual controllers and enclosures to match the current system so that leaves the DS3400 with an additional 12 disk enclosure or a DS4700. For this scenario both systems are identically priced since they are covered under initial project costs. Expansion by adding more disks and enclosures for the future is not free and I understand there is quite a price differential between SAS and fibre channel disks.
Which should I get, I'll be tied in to buying the same disk type for the foreseeable future