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RAID Question

N

netsider

Limp Gawd
Joined
Oct 12, 2004
Messages
466
I'm currently running RAID 0 with two 80GB SATA drives for performance. However, I'm also seeing that my system combined the drives into one logical drive (C:) of 160GB WITHOUT using JBOD. How is this even possible? I ran benchmarks, first using raid, and I got a read rate of around 100 MB/s. Then I tested each drive independently and each SATA drive showed a read rate of around 50 MB/s. So.. they're definitely running in tandem on RAID 0 at 100 MB/s... but how is this even possible, since I'm seeing C: as 160GB? I've ran RAID 0 in the past on these drives, but in a different system, and it combined the drives in RAID 0, with the same reading rate of 100MB/s, but only showed the logical drive of 80GB (as I would expect). Is there something I'm not knowing here? Thanks guys... any help would be appreciated.

PS. I'm not "down" over this problem, I'm actually kind of happy, since I seem to be getting both the benefits of JBOD and RAID 0 all in one. Just kinda wondering why...
 
The size of the drives is added for raid 0 because they stripe data across two drives. This still uses the full storage of the drives, just spread equally among the raid drives, thus effectively halving the work each hard drive has to do to read or write a file (assuming a 2 drive raid setup).
In raid 1 the data is written on two drives at the same time. This ensures the data always has a backup in case a drive fails, but you will only have 80gigs of space that way.
 
I thought that too, but he was still getting higher benchmarks at that time.
Just a fluke I suppose.
 
BTW. Since these drives are obviously old. Make sure you have proper backups if you care about your data.
 
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