Barolo
Neuling
Imation ist mein Kunde, ist OEM von MTRON-PRO-Serie (MOBI-kommt auch noch)
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Aristo - ich hab keine Ahnung was du arbeitest, aber du weisst zuviel über SSDs
eine idee warum der burstspeed sich von deinem unterscheidet - könnte es sein das hier der 4x pci-e ausbremst ?
Are MLC SSDs Ever Safe in Enterprise Apps?
SLC versus MLC in Enterprise SSD arrays
Editor:- February 27, 2008 - The original purpose of my SSD Myths article was to show that you needn't worry about wear-out if you use "best of breed" flash SSDs with write-endurance on the order of 1 million cycles and above.
When it was first published (in March 2007) all flash SSDs in traditional hard disk form factors used SLC.
But in the year following publication many leading SSD oems (including Samsung, Mtron and STEC ) have also introduced MLC products too.
MLC doubles the capacity of flash memory by interpreting 4 digital states in the signal stored in a single cell - instead of the traditional (binary) 2 digital states.
This technique has been commercialized and proven over many years in hundreds of millions of cell phones and MP3 / iPod music players - where the theoretical consequence of data corruption (if anything went wrong with this risky "new" storage technology) was no more serious than an inaudible sub millisecond sound blip or invisible pixel splat.
In the SSD market MLC yields much lower cost storage than SLC with read / write speeds which are nearly as fast as the best SLC devices.
The manufacturers of first generation "hard disk replacement" MLC flash SSDs have responsibly classified them as aimed at the "notebook market" and by subtle wording differentiated them from their more pricey "enterprise" products. In the low duty cycle world of a notebook these MLC SSDs should give a good operating life - typically similar to the hard disks they replace. (Most SSD marketers would claim their MTBFs are even better than HDDs).
But there's no way to tell the difference between SLC and MLC SSDs externally (apart from the model numbers). Put them in a rackmount system in a datacenter with fast processors which can pump them continuously close to the maximum speed and what happens?
It's a simple matter to plug new data for MLCs into the calculation I did for the worst case wear-out process for flash SSDs - which I called the Rogue Data Recorder.
Instead of the 64GB example I used then, I'll assume the MLC SSD has 128GB capacity. MLC SSDs have more capacity than SLC. And more capacity means longer operating life - before cells wear out.
I'll still use the 80M bytes / sec sustained write speed - because the fastest MLC products (in Feb 2008) can already do that. (Meanwhile the fastest SLC products have moved up in the world and are about 50% faster.)
The next factor is where we hit the big problem... Instead of a write endurance rating of 2 million cycles (for the best SLC) - I can only use a figure of 10,000 for MLC. MLC has a much lower rating due to the complex interaction of discriminating multiple logic levels reliably coupled with the intrinsic failure mechanism of wear-out.
Plugging these numbers in the same calculation gives an estimated MLC flash SSD operating life (at max write throughput) which is 6 months! (instead of 51 years for a 64GB SLC SSD).
That's not good enough for a data driven enterprise. There isn't a wide enough safety margin.
Proponents of MLC might say - can't you batch select MLC chips for better write endurance in the same way that some oems do for SLC wear out? - Couldn't that give a figure that is 10x better?
There's not enough data to give a definitive answer - but I suspect the answer would be no!
The reason is that you would be selecting for the mutual inclusion of a single chip being inside 2 different probability curves for what are already secondary characteristics. (Like looking for the ideal man in Sex and the City.) Even in the unlikely event that you could find some devices with the magic properties to do this - the yield would be small - pushing the cost up and eliminating the main reason for using MLC.
That's where I thought this "SLC versus MLC in enterprise SSDs" discussion would end. But then another factor appeared out of the blue.
Schlechtes "Wear-Leveling-Management" denke ich gibt es nicht ... es gibt halt statisches und dynamisches .. jedes hat Vor- und Nachteile.
Welches sind die Vor- und Nachteile?
noe der kommt nicht oft in den Forum .. fragen tu isch trotzdem
aber muss er das ganze formatieren ?
-> Teuer -> Static
The algorithms which map addresses to physical media locations vary from manufacturer to manufacturer - and in many cases - like the formula for making Coke or Pepsi - the details are closely guarded commercial secrets.
ehrlich gesagt habe ich unter windows bis jetzt keinen gefühlten schub von ich9r (knappe 80mb/s) zu dem areca jetzt (220mb/s).
ehrlich gesagt habe ich unter windows bis jetzt keinen gefühlten schub von ich9r (knappe 80mb/s) zu dem areca jetzt (220mb/s).
Du merkst das beim Schreiben vieler, kleiner und grosser Dateien, beim kopieren innerhalb der SSD und beim Entpacken. Das hab ich aber damals geschrieben.
Wenn du mal den FC-Test machst (simuliert das Entpacken vieler, kleiner Dateien) merkst du einen krassen Unterschied zw. ICH9R und dem Controller (siehe Post #1)
Wollte Intel nicht auch demnächst im SSD Markt mitmischen?
Ist Samsung eigentlich auch schon aktiv dabei? Von denen hätte ich von Anfang an die größte Palette erwartet. Die sitzen ja schließlich direkt an der Quelle.
Auszug aus unserem Handbuch
Mtron SSD supports both static and dynamic wear-leveling. These two algorithms guarantee all type of flash memory at same level of erase cycles to improve lifetime limitation of NAND based storage.
Hi Snoopy69, ich lese schon einige Wochen mit, wenn meine Steuerrückzahlung ~nett~ ausfällt liebäugel' ich mit einer SSD Systemplatte Verstehe ich Dich richtig das der ICH9R für das Wunschanwendungsgebiet einer sagen wir Single 64GB SSD:
- lautloser, kalter Betrieb
- schneller Boot des OS
- kleinere Anwendungen gefühlt instant da
vollkommen ausreicht und nur für die besonderen Poweruser mit grösseren Dateien, Packoperationen, "Edelbenchmarking" oder RAIDs ein extra areca Controller notwendig/sinnvoll ist?
j
samsung hat sich bisher fast nur auf MLC konzentriert und fängt jetzt erst mit SLC an. Aber denen reichts ja auch, wenn sie die andern Hersteller mit NAND-Flashs beliefern.