Saw this on twitter today: iSCSi is a dog
cloudcomp_group iSCSI is a dog only when you’re not doing some sort of hardware offload or when you need high throughput. There are many many applications that do just fine with Sure, but you lose a significant amount of storage in the interim. > With nominal capacities running in the 146gb range (for good > drives…not failure-prone knockoffs), you would require 10x’s the > amount of drives to git the same usable capacity of a 1.4tb SATA drive > (which, btw, would consume less aggregate power than those SSDs). > > The scale is not there. >
Time to clear up a couple of myths about iSCSI:
- iSCSI is 1Gb only
- iSCSI uses SATA drives exclusively
- iSCSI is slow
Point 1: 1Gb vs multi-1Gb vs 10Gb: It is pretty save to say any higher-end enterprise class IP SAN offers multiple gigabit ethernet ports for redundancy and performance. In our case, all of our IP SANs have at least 3 connection — even at the low end. Putting the theoretical performance right at the 4Gb fibre channel. Many vendors (like us) also have 10Gb IP SANs. These SANs are obviously much faster than the previous generation 1Gb SANs. Some of the 10Gb SANS even offer dual 10Gb connections. So iSCSI s only as fast as the server feeding it data.
Point 2: iSCSI uses SATA disk only. First and second generation iSCSI solutions utilized SATA disk exclusively for cost savings and ease of deployment. Some vendors even offered tiered storage with FC or SCSI disk and SATA in the early days. (We offered multiple levels of disk starting in about 2005). With the advent of SAS disk, most enterprise focused vendors offer SAS and SATA disk in the same chassis for additional performance with transactional data, and tiering of storage so IP SANs can be used for multiple applications: email, backup and heavy duty processing. iSCSI is a great fit for most applications, but the absolutely heaviest transactional data. (Think NYSE).
Point 3: iSCSI is slow? You haven’t been to our labs, we are seeing performance in excess of 900MB/s with 10Gb, in a single IP SAN. Wow, I think that’s pretty fast.
Picking out storage is a lot like choosing a car. All of them get you places, and basically handle the same things, but when you go offroading, you might want to rethink bringing your Honda Civic. One size fits all doesn’t work for cars, or storage. And there are many options depending on what you need.
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