Faster RAID

Buck

Buck

Storage? I am Storage!
Joined
Feb 22, 2002
Messages
4,514
Location
Blurry.
Website
www.hlmcompany.com
"This chip allows us to access the mainstream market," said Andy Mills, NetCell's chief executive.


Well, then let's see something!
 
P5-133XL

P5-133XL

Xmas '97
Joined
Jan 15, 2002
Messages
3,173
Location
Salem, Or
Someone is making a card. Otherwise how could Tom's Hardware produce another Junk-review on it.
 
I

Ice Czar

What is this storage?
Joined
Jul 8, 2003
Messages
1
blakerwry said:
hmm.. dedicated parity disk.. byte level vs block striping.. that would be called RAID 3...

gee... how many people use RAID 3?
Click to expand...

"SynchRAID is based on the same principle as the original RAID 3 bit-wise stripe approach, a technology well known for its advantages in video and large file streaming applications"

"In particular, the architecture is capable or striping directly onto a disk array at word level without the need to break the data into striped blocks or chunks, making the approach far faster and simpler to implement. For example, data may be striped directly onto the array as 64 bit words"

"190 to 200 Mbytes/s of sustained read throughput, and up to 120Mbytes/s of sustained write throughput"

Support for up to 512MBytes of storage cache RAM
Five integrated ATA UDMA-5 (100MB/s) ports for direct connection to parallel ATA drives or SATA 150 drives via ATA-SATA bridge devices

"However, off the shelf ATA and SATA drives may be utilized directly; i.e., no special synchronization or spindle-sync hardware is required as with original RAID 3"

"Figure 1 illustrates how 64-bit data word destined for the drive array in aSyncRAID controller is handled veruss a legacy RAID controller. For a legacy RAID 16-bit ATA implementation, a block of 64-bit data words from a host bus is divided into a stream of 16-bit words and issued to individual drives until the block stripe is full or the block write is complete. If the block occupies more than a single drive stripe block or "chunk" then it moves onto the next drive to start using another stripe block until the entire block transfer has completed. As we shall see later, the parity generation or update method very much dictates the performance of array write operations.
SyncRAID, due to its innovative synchronization scheme, removes this data and blocking arrangement altogther, keeping the data words intact as 64 bits all the way to the drives. This effectively creates a 4x-speed ATA interface. Applying the concept to multiple SATA drives, the interface becomes a 4x SATA interface, and so on."

"the effective data rate becomes ATA400. For SATA150 drives, the overall rate becomes an effective SATA600" of course that is burst not STR

"In the case of RAID XL3, the data is simply written to the array and the parity data is overwritten with the new parity information, on the fly in a single step"
 
Corvair

Corvair

Learning Storage Performance
Joined
Jan 25, 2002
Messages
231
Location
Desolation Boulevard
Definitely not vapourware, but also *still* not available in the retail channel -- yet. Maybe that'll change soon.

I wouldn't mind seeing a RAID-0 and RAID-5 shootouts between the NetCell and 3Ware's best.

  • SEAGATE, NETCELL TO SHOW EASY-TO-USE, HIGH-PERFORMANCE EXTERNAL SERIAL ATA STORAGE AT IDF

    Storage Solution Gives Small and Midsize Businesses and PC Users Innovative, Significantly Easier Way to Boost Performance, Add Capacity and Protect Data

    SCOTTS VALLEY, Calif.—28 February 2005—Seagate Technology (NYSE:STX) will team with NetCell at the Intel Developer Forum this week to demonstrate an external Serial ATA (eSATA) storage solution that...



http://www.seagate.com/cda/newsinfo/newsroom/releases/article/0,1121,2638,00.html



And, good information from the fossil record for the interested:

http://www.eetimes.com/issue/semi/OEG20031124S0047

 
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