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Both Accusys and AMCC deliver high performance in all RAID modes we tested: RAID 0 is ideal for temporary data and high-performance applications with no need for data redundancy. You’ll get up to 320 MB/s read performance on both devices, and 300 MB/s writes with Accusys’s iRAIDer and 270 MB/s on the AMCC 3Ware Sidecar. These numbers are close to theoretical limits. Throughput is somewhat slower when using a safe RAID 1+0 or RAID 5 array, but still much faster than anything you can get on affordable iSCSI SAN solutions or NAS platforms. However, while Accusys is superior when it comes to sequential performance and plain throughput, AMCC provides much quicker I/O performance across all I/O benchmark patterns.
Both products function alike: they consist of a PCI Express RAID controller and an eSATA external drive enclosure with hot-swappable drive bays. Accusys offers locks for each of the removable frames, an LED status display, more cache memory and RAID 6 support, together with an optional 8-port version, but its product is noisy and the controller card is too large to be installed in low-profile servers. AMCC offers a more compact controller card with a smoother management front-end and Apple compatibility. Battery backup units and hard drives are not included, and the price points are similar at $800 for Accusys and $850 for AMCC.
PC users with fileserver requirements and a dedicated server room where the noisy iRAIDer can operated will find the ideal solution with Accusys. Everyone else should consider carefully, as both products are very similar.
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How does this compare to a DIY Linux Software RAID? Price? Performance? Reliability?
Unlike a hardware solution, if the controller card dies, you can forget about getting your data back since there is no "Standard" for RAID. On Linux you could just put the drives into another PC, as the meta-data for software RAID on Linux is not going to change across different versions of Linux.
Thanks for the article - you have convinced me not to even consider either of these.
RAID 10 should be faster than any individual drive for reads and writes, and it should also be faster than RAID 5.
Something is wrong here - either with the hardware or the tests.
Actually performance isn't capped at 1 cable. There are a number of solutions that have multiple connections using iscsi, some even route between the connections dynamically on the server side and you can bond the ethernet connections on the client side to achieve performance maxing out the quantity of connections on the client machine. Of the ones that we tested (day job) there were only a few that met performance needs. All the arrays max the cable(s) out with straight read/write, but the performance on a number of array's drops drastically when you staring hitting them with more clients (20+) for read/write scenarios. Of course, these solutions are only really useful if you have, say, 100K (or more. Alot more in some cases) lying around.
It's a crying shame that storage "solution" providers (and Tom's Hardware) don't look at the needs of the laptop marketshare. This would be just what I need, but the controller cards are deal-breakers.