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Re: Drive comparison

COW Forums : Ciprico storage solutions

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Lance R. GropperRe: Drive comparison
by on Oct 3, 2006 at 9:56:12 pm

Hello Again Jerry:

Here's another way to think about it: In networking, in the olden days, we used to use 10-base-2. In this configuration, each computer would have a BNC T-adapter attached, and the computers were daisy-chained one to another, with a BNC terminator on each end of the chain. This is very similar to SCSI - SCSI is a bussed architecture - there are terminators on each end of the bus with devices inbetween (the computer host adapter is just another device on the bus). Because if one device went down in a SCSI chain, you'd have to disconnect the chain to remove the device, it would take down the entire chain in the meantime, so it was with 10-Base-2. In 10-Base-2, if the chain was broken, all devices/computers went down. A fix was needed - hence 10-base-T. In 10-base-T, there was a hub (or switch), and all of the computers would connect to it. If a computer went down, it didn't usually impact the other computers attached to the hub/switch. Fibre can be considered to be similar to 10-base-T - (Ordinarily), the devices would be connected to a hub/switch. If one device goes down, it usually does not affect the other users/arrays on the switch. In SCSI, you have a maximum cable length of, well, as short as possible. In Fibre, Atto supports up to 650 feet (optical), with the spec allowing for up to 2 miles of cabling (optical).


Lance Gropper
Ciprico


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