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Adaptec AAA-UDMA RAID Controller

Adaptec AAA-UDMA RAID Controller - PCSTATS
Abstract: The controller is the AAA-UDMA, a four-channel UDMA/66 RAID controller supporting up to four hard drives in RAID 0, RAID 1, RAID 0/1, and RAID 5 configurations.
Filed under: Servers Published:  Author: 
External Mfg. Website: Adaptec Mar 30 2001   D. Dee  
Home > Reviews > Servers > Adaptec AAA-UDMA

RAID 0 Performance

Regardless, it seems that this controller's RAID 0 functionality is mostly just good for write speeds, as in many cases its read speeds are lower than that of a single drive. Certainly the performance is nowhere near what I expected from a hardware RAID 0 array. For comparison, I created a four-drive software RAID 0 array as a comparison. Instead of creating the array with the controller, I simply booted Windows 2000 Professional with all the drives unused by the RAID controller. Windows detected them and I simply created a software array through the Disk Management applet. Here's how it performed:

While the processor usage is understandably higher, this configuration provides much better results overall. Still, this controller is supposed to be a hardware RAID device, and it's simply unacceptable that it's faster with software RAID. The whole point of hardware RAID is to take the burden of array processing off the CPU and make it faster than the CPU could do it anyway, but the AAA-UDMA utterly fails to do the latter. And the software array's CPU utilization isn't all that much higher anyway, so the controller itself doesn't seem to be contributing much at all. If you want a hardware-based RAID 0 controller with low CPU utilization, look elsewhere.

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Contents of Article: Adaptec AAA-UDMA
 Pg 1.  Adaptec AAA-UDMA RAID Controller
 Pg 2.  A little about RAID
 Pg 3.  Initialization time for the array
 Pg 4.  The full specs
 Pg 5.  Three Drives improve performance
 Pg 6.  — RAID 0 Performance
 Pg 7.  RAID 1 Performance
 Pg 8.  OS Supported
 Pg 9.  Software management
 Pg 10.  CI/O software
 Pg 11.  RAID 5 benchmarks
 Pg 12.  processor usage
 Pg 13.  Conclusions

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   12 / 14 / 2018 | 10:31AM
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