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Controller ACS-61020CB

External RAID Storage

external raid storage

The card utilizes an Intel 64-bit Xscale IOP333 processor running at 500 MHz, providing decent performance for XOR acceleration in RAID 5 or RAID 6. The PCB was designed to offer two eSATA ports, but only one connector was available on our sample. The optional battery backup unit (BBU), which buffers data within the 256-MB DDR2-400 ECC cache memory in case of a power outage, wasn’t included with the kit.

RAID levels 0, 1, 0+1, 5, 6 and JBOD are supported, and the card features all the RAID options administrators appreciate: RAID expansion and migration is supported. The device supports the creation of storage snapshots, instant RAID initialization, 2+ TB volumes, multiple RAID arrays, automatic rebuild and disk scrubbing with bad block recovery. Unfortunately, the RAID controller card has a height of 111 mm and so doesn’t fit into low-profile servers.

external raid storage

RAIDGuard X 1.7 Software

external raid storage

Accusys bundles its RAIDGuard software, which is based on Java, and so compatible with all major operating systems. Once installed, you’ll have to select a RAID level, stripe size and sector size. Hard drives are selected by clicking on the drive icons; the software will display the drive model and firmware version (revision). After selecting on-the-fly or standard initialization, the array will be created immediately.

external raid storage

external raid storage

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  • 0 Hide
    cruiseoveride , May 3, 2008 1:00 AM
    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.
  • 0 Hide
    candide08 , May 5, 2008 7:24 PM
    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.
  • 0 Hide
    mutsu , May 15, 2008 1:40 PM
    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.
  • 0 Hide
    a_k_a , August 23, 2008 6:41 PM
    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.