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Worth the effort?

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April 15, 2011 2:35:08 AM

Hi,

I plan on using SSD storage for frequently accessed data (OS and apps) in my next build and was wondering if it's worth getting 2 SSDs, putting them in hardware RAID0, then doing a soft RAID1 with an identically sized storage drive partition for redundancy. I don't do a lot of writing so the writing performance shouldn't be too much of an issue, and the reading shouldn't be slowed due to most random access data being pulled off the SSDs quickly. Am I correct to assume this sort of performance? Or is this a useless idea?

Thanks

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a b G Storage
April 15, 2011 2:43:17 AM

hmm?.. kind of an interesting question. If I had to guess here, I would say that the performance would be dragged down considerably by the software raid.

Would be easiest to just use the cheap prices for HDD and implemet a good backup strategy for the SSD R0 on an R1 HDD array.
a c 98 G Storage
April 15, 2011 6:10:00 PM

^ +1 Agree. SSD in RAID 0 for OS and apps, and 1 large HDD for data/media/storage.

Check out my signature....
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a c 415 G Storage
April 15, 2011 6:42:15 PM

First of all I don't think you can assume that all the reads will go to the SSD. In a RAID-1 configuration a "dumb" RAID controller will simply round-robin the I/O requests to alternating drives, and a "smart" RAID controller will direct I/O requests to the device whose heads are closest to the desired data (i.e., whose last I/O request was to the closest LBN). In either case you can probably expect about 50% of the I/Os to go to the hard drives, in which case you'll actually be killing the performance of the SSDs.

Secondly, RAID-1 is not a backup. It doesn't protect against theft of the computer, corruption, power hits, etc. RAID-1 protects only against media failure, and SSDs are probably less likely to suffer a failure because they have no mechanical parts. Since you need an external backup anyway, you're better off to use those hard drives for that purpose rather than for RAID redundancy.
a b G Storage
April 15, 2011 11:38:38 PM

yep. HDD is so cheap now.. I just set up another R0 to back up my R0.

Wastes space.. but twice as fast at doing it. LOL
April 16, 2011 12:38:12 AM

TY for the advice;
Could you recommend a piece of free software I could use to run regular backups of the SSD drives on an extra HDD? The reason I considered soft RAID 1 is because it is very seamless at the end of the day...
a c 98 G Storage
April 16, 2011 2:02:47 AM

What's wrong with Windows Back Up?

Try Microsofts SyncToy 2.1. You can set up what to back up where, you just have to run it.
!