I need help with a question.

D

districtfelon

New Member
Given a set of Seagate hard disks, 7200.9 ST-3250624AS, direct-attached to a server, what is the theoretical effective bandwidth of each of the following RAID organizations?

1)4-disk concatenated JBOD
2)4-disk RAID0
3)4-disk RAID1
4)4-disk RAID5
5)8-disk RAID5
6)18-disk RAID50, comprised of three 6-disk RAID5


i'd appreciate it if anyone can help me out.
 
For striped arrays, this is assuming ideal conditions (aka fake)

1. Single disk bandwidth.
2. 4x bandwidth of a single disk.
3. Single disk bandwidth
4. A 4 disk RAID5 of raptors scored ~140MB/s (h2benchw) so I would say some 7200.9s would be a bit slower 120MB/s maybe.
5. Ballpark 200MB/s (again raptors got 235 in h2benchw)
6. Hell if I know. If I had to guess, I would say it would be comparable to to 6 disk raid 5
 
ok so when I look up the seagate it says its "Host Transfer Rate" is 300 MB/s so when you say single disk bandwidth, do you mean its 300MB/s? and for the second part when you say 4xthe single bandwidth you mean 1200MB/s?
 
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