SAN, NAS, Cost and Benefits?

luetin asks: "Our company is at the point where our storage and backup infrastructure is ok, but not for much longer. We are looking into SAN, NAS, and variations thereof. We are a small IT department, with two sysadmins and two programmers. Right now we have stored/circulating about 2TB of data, and that's going to increase steadily in coming years. Does Slashdot have experience setting up SANs? Tales of costs and benefits of SANs versus a gaggle of NAS? Can SAN be implemented by reasonably seasoned IT people, or is it too dark an art?"

Comments

Opposing opinion

[GigsVT]

I'd have to go against the well-funded flow here.

Right now you can get 3TB+ of storage in a single SATA RAID5 unit from www.acnc.com, for about $11,000.

You can get it with a SCSI or FC external interface. Use two of them hooked to two computers in two locations (preferably 300+ miles away) with rdiff-backup if you want extra redundancy. We use local and remote mirrors for maximum protection. The space is so cheap, it's easy to keep extra mirrors.

We've finally eliminated our last major SCSI and FC arrays, and I couldn't be happier. We're up to about 6 TB total ATA and SATA storage now. Get cheap storage if at all possible, because it will be obselete in need something that a cheaper system can't offer. That isn't much these days, now that 10K rpm SATA drives are out.

As far as single drive reliability, the first ATA unit we installed has been in service 2 years this month. We've only replaced two drives out of 48, and even then, the drives passed the factory recertification tests from the manufacturer when we ran them on them. And even if you think that's a higher failure rate than your experience with SCSI/FC, keep in mind that the cost is so much lower, it lets you have more mirroring redundancy, so individual drive failures are much less of an incident.