These storage devices need to be used in RAID-0 stripping. 70-80Mbyte/sec per single device is acceptable.
On the host side, I must (it's a constraint) use the PCI-X, and it seems I have only three choices on a rack machine to connect the external storage:
- 1) SFF8470 multilane 4X SAS-->SATA by a PCI-X@133Mhz adapter. SIL's are fine for this.
- 2) four firewire/800 cables, attached to a four fw/800 PCI-X@133Mhz adapter. Adaptec's are fine for this.
- 3) FC--optic--FC cable, attached to a FC PCI-X@133Mhz adapter. QLOGIC's are fine for this.
1) The first solution
- qty=1, SFF8470-to-SFF8470
- qty=1, SFF8470 SFF8470-Slotblech-adapter-to-SAS (I can modify the storage cabinet)
those cables and slotblech adpters are a bit expensive (~ 90E/cable, 30E/slotbench)
2) The second solution
- qty=4, firewire/800 cables (bonding configuration, not chained, my PCI-X-FW/800 supports it)
I have never seen any firewire/1600, that would be COOL, anyway, the firewire itself is cool since it supports advanced features like DMA and peer-to-peer transfers. The understanding of FireWire and USB specifications does nothing to diminish the warning that some OEMs tie the these two together in their combo-solutions where they are prone to use a chip able to drive the USB2 bulk protocol, and the SBP2-b protocol, but with the bandwidth of the USB2. I have a direct bad experience with such attitude, and the Firewire/800 combo USB adapter to SATA can't provide more than 40Mbyte/sec even if the storage device has already shown better performance, up to 120Mbyte/sec on a SATA link.
I can claim the above because a friend lent me his FW/800 disk adapter (it's fw/800 only), I plugged my SATA-device in, and once connected to my Firewire/800 PCI-X card, the same system was able to perform up to 80Mbyte/sec!
The difference between before, and after, is the Firewire-to-SATA adapter on the storage box. Mine is a combo USB, and it's shitty.
3) Concerning the third solution
... well ... I can, in theory, use an FC (optic) adapter, e.g. QLOGIC happens to have some PCIX@133Mhz adapter for the fiber channel, whose benefits are -a smaller cable- and -a larger bandwidth- (200Mbyte/sec, at least)
The problem with FC is ... what to buy? I know there are a few rack-mountable units able to accept SFP and drive disk attached to 4 mini-SAS QSFP cables, while other FC-solutions are usually on the way of the big array of disks choice, whereas I only need to connect four SATA1 devices to *something* on the PCI-X of a linux-non-x86 system.