Help!! OS HDD (10k), Raid (10k), Ghost (7200)

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Bigel1

New Member
Hi, I am hoping someone can help me with a problem I am having... I am trying to do decide whether to do the following layout for my computer:
HDD 1 - MAIN OS (10,000 RPM)
HDD 2 - RAID (10,000 RPM)
HDD 3 - GHOST (7,200 RPM)

I need to know if having the GHOST at 7,200 RPM will slow down the MAIN HDD and the RAID HDD, and if I need to make the GHOST a 10,000 RPM HDD to prevent that...

Also, I am having difficulty deciding between which HDD to go with…

Western Digital VelociRaptor WD1500HLFS 150GB 10000 RPM SATA 3.0Gb/s
Cache: 16MB , Average Seek Time: 4.2ms, Average Write Time: 4.7ms, Average Latency: 5.5ms

OR…

Western Digital Raptor X WD1500AHFD 150GB 10000 RPM SATA 1.5Gb/s
Cache: 16MB, Average Seek Time: 4.6ms, Average Write Time: 5.2ms, Average Latency: 2.99ms
 
I will have the Ghost backup once every 2 weeks probably... I just didn't know since it's not running all the time, if its not a big deal that its at 7,200RPM. I understand that the RAID and the Main HDD need to be the same RPM, but I was unsure about the Ghost.
 
Ya 7,200 is the way to go for the backup, it'll hopefully be more reliable as well.

What kind of RAID will you be setting up? When you say main HD and RAID HD, you do realize that RAID requires 2 or more HD's, right?
 
Hi,
I am curious as to why you say the 7,200 would be more reliable?

Also, will the Ghost being a 7,200 slow down the response time of the Main HDD? Someone told me that if two HDD's are operating at different RPM's, that the computer will automatically take the response time of the lower RPM.

I am trying to set up a RAID to duplicate (mirror) the main HDD. I don't recall which type of RAID that was, but you mentioned that the RAID requires 2 or more HD's... I was trying to have my MAIN OS HDD duplicated (mirrored) by another HDD (the RAID)... Are you saying that I will need 2 HDD's in order to duplicate (mirror) my MAIN OS HDD?

BTW, I do appreciate your responses and cross checking my work, it really is greatly appreciated it.
 
1) 7,200 is less RPM, less wear on the drive. It's somewhat like overclocking, you get the extra performance but you sacrifice longevity. However, I have seen high performance drives last a long time but there are always extremes, good and bad.

2) If you're running a RAID, you don't need matching drives, but I misunderstood your original question, and I apologize about that. I highly recommend having matching drives, but for performance consider the following.

Consider a RAID 0 setup with dual 10k drives for speed (to keep OS and programs). This increases speed because the data is split, half to one drive half to another.

Second, consider a RAID 1 setup with a couple 7,200 drives for data backup. The data backup is real time, when data is written or read it is done so on both drives at the same time.
 
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How long do the 10,000rpm hard drives typically last?

I understand that in order to do a RAID i don't need matching HDD's, but I was told that if I have 1 HDD that is 7,200rpm, and another thats 10,000rpm, that the computer will operate at a 7,200rpm speed. Is that correct?

I am planning on, and would like to do 3 HDD's total...
1 - MAIN HDD (OS, Programs, and everything) - 10,000rpm
2 - RAID HDD (Mirrorring the 1st HDD) - 10,000rpm
3 - GHOST HDD (making backups of the 1st HDD weekly) - 7,200rpm

Can this be done?
 
Bigel1 said:
How long do the 10,000rpm hard drives typically last?

I understand that in order to do a RAID i don't need matching HDD's, but I was told that if I have 1 HDD that is 7,200rpm, and another thats 10,000rpm, that the computer will operate at a 7,200rpm speed. Is that correct?

I am planning on, and would like to do 3 HDD's total...
1 - MAIN HDD (OS, Programs, and everything) - 10,000rpm
2 - RAID HDD (Mirrorring the 1st HDD) - 10,000rpm
3 - GHOST HDD (making backups of the 1st HDD weekly) - 7,200rpm

Can this be done?
Click to expand...

1) Yes, that is correct.

2) Yes, that setup is possible. Why would you need 2 backups of the main drives though? It would make more sense to have the two 10k drives in a RAID 0 and have a third drive to run a ghost image of those drives.
 
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