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7:40 AM - 08/10/2007 by
Patrick Schmid
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RAID Initialization Time
We used eight Seagate Savvio 10K.2 hard drives to determine the time needed by the controllers to create a RAID 5 or RAID 6 array.
| Controller | RAID 5 | RAID 6 |
|---|---|---|
| Adaptec RAID 3805 | 1 hour 12 minutes | 1 hour 2 minutes |
| Atto | 23 minutes | n/a |
| ICP 5085BL | 57 minutes | 57 minutes |
| Raidcore RC5252-8 | 2 hours 42 minutes |
Clearly, the cards with the faster XOR accelerators complete the array creation task quickest. However, all products support background initialization, which reduces available performance but lets you start using the array right away.
RAID 0 I/O Performance
...well,
- Unless RaidCore is trying to peddle their VST Pro software,...aka as Fulcrum proprietary based ? which BTW you said no to, I don't see any advantages here.
Why?, ZFS is free !
And, where are the Drives for Solaris, or the xBSD's , or even MacOSX !!!?
-and still no, becuase their newer 54xx series doesn't support the other 'ix OS's.
Nope, unfortunately, not much to see here.
so, based on the above, Adaptec 5805,... or Areca,... blows this.
-Rikster
I think this paragraph has an error. I believe it should read
For SAS, the two connector segments were merged, which makes it possible to attach a SATA drive to a SAS controller using the continuous connector, but you cannot hook up a SAS hard drive to a SATA controller using the SATA connector (SFF 8482).
In fact I believe the statement should have less emphasis on the connector as its the actual controller that appears to limit the connectivity, the connector is just keyed to allow you to plug SATA drives into SAS but not the other way around.
from wikipedia: "SATA 3.0 Gbit/s drives may be connected to SAS backplanes, but SAS drives may not be connected to SATA backplanes."
I believe the fact that signaling voltages are nearly double on a SAS drive is significant to mention.
Let me know if I am wrong, I just started playing around with a bunch of SAS drives so I am figuring this out as I go.