That most likely isn't correct, Raid 1+0 is often described as supporting "at least" one drive failure, but that isn't the same as two drives.

It is a mirrored stripe set, so you could have two drives fail and be fine, if they are both the same side of the mirror, but a second drive failure could also take everything out!

Get it changed ASAP is my advice +++

I've forgotten (having long left the corporate IT world) all the RAID variations, but we used to run systems that would automatically fail over (and keep running) in the case of a single drive failure and rebuild a resilient array automatically onto a "hot spare" sitting there already powered up and spinning.

Plus all drives would be "hot swap" so you just pulled the faulty one out and stuffed a new one in.

But that was at least 15 years ago so maybe things have improved a bit since then?

Though the mainframes I worked on decades before that were much cleverer, with resilient load-balanced controllers, dual access paths to all peripherals, multiple processors and memory banks as well; they basically had almost no single point of failure in the whole system. :cool:

RAID hasn't moved on that much to be honest, you probably used RAID5 with a hot spare, which didn't really scale to current disk sizes. RAID10 (1+0) is the current norm (big drives are cheap now), again some controllers allow a hot spare, but not usual in a microserver!

http://www.raid-calculator.com/raid-...reference.aspx gives a bit of background as to how each mode works.

http://www.zdnet.com/article/why-rai...rking-in-2009/ explains why RAID5 didn't really scale....

It's entry level for me so no hot swap but it does run happily with 1 drive failed and I have a new one in the post.

Enough about RAID. I am more interested if somebody would like to share purchase of Innosilicon A5 miner.

Good good, it will run happily and will re-gain resilience when you install the new drive.

Not for me thanks, but good luck anyway :ROFL:

Minimum purchase from Innosilicon is 5 units though isn't it? Otherwise I'd have bought an A4 by now. Can't afford 5 at once :(

This looks interesting https://www.eastshore.xyz/ there's a fair premium on the prices, but at least you don't have to play the bitmain 5-minute stock lottery. They also seem to sell single Innosilicon units.

I know it's 5 uninits minimum order and out of stock from Innosilicon. I was thinking about this one https://asicminermarket.com/product/...-miner-30-2gh/

It is $3k more but it is single unit and available to order, last time I checked there was 28 available, now only 11 left. $3k extra might seem a bit much but could be worth it to get in the game early(ish). At current rate you would get it back in weeks time but even if you get the extra cost in 2 months it would be still worth it.

It turns out Bitmain has it's own dash miner as well. Half the hashrate but ~25% price and higher power consumption. I could actually afford this one by myself but obviously out of stock. This does raise a question if dash is easily scaled up and if returns would drop dramatically. https://shop.bitmain.com/productDeta...38V537cuy7067F