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PERC 5/i RAID Card: Tips and Benchmarks - Page 327

post #3261 of 7276
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Quote:
Originally Posted by sofakng View Post
Thanks.

One other question...

Can you have one drive be a part of two arrays?

For example, let's say I have a 4x 1 TB RAID-5 array. I have a 1.5 TB drive that I'd like to add to that array but I don't want to lose the extra 500 GB. Can I make 1 TB of that drive part of the RAID-5 and then use the other 500 GB part of a different array? (RAID-0 or RAID-1)
No. If you did, each array would have to wait until the other array was done... defeating any performance increase.
Once again...
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post #3262 of 7276
Guess I'll have to sell the drive and try to get two 1 TB's or something then
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post #3263 of 7276
You could use the array as you detailed, but performance would suffer if you needed both arrays at the same time. Whether or not it is a good idea or not depends on what you need the array for.

If you want to use the extra space for an OS disk and still perform high IOPs on the RAID5 array performance would be poor. If however all you want is an extra storage volume for use over a LAN or similar then the performance hit would likely be small.
post #3264 of 7276
My perc 5i will be here soon but got more of a standard raid question. If a drive dies in a raid 5 array. When a replacement drive arrives will the array be able to reabsorb the 4th drive back into the array?
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post #3265 of 7276
Quote:
Originally Posted by Starbuck5000 View Post
My perc 5i will be here soon but got more of a standard raid question. If a drive dies in a raid 5 array. When a replacement drive arrives will the array be able to reabsorb the 4th drive back into the array?
Yes, it's called rebuilding. And even while the 4th drive isn't installed it can still run in a degraded state, just a bit slower.

But don't get into the habit of removing and replacing drives whenever you feel like it with RAID5 - reading 1TB of data off a hard drive pretty much guarantees at least 1 bit incorrect with today's error rates. So when reading off of 3 1TB drives to rebuild the 4th, that's going to be 3 or so incorrect bits. If you have a lot of multimedia you probably won't notice that it happened (would you notice the color of a single pixel of a single frame of 30FPS video was slightly off?), but you never know if it might change something important.

If you run RAID6 you're pretty safe though, because there's still the second set of parity that the data gets checked against. Unfortunately the Perc5 doesn't do RAID6.
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post #3266 of 7276
Quote:
Originally Posted by Manyak View Post
Yes, it's called rebuilding. And even while the 4th drive isn't installed it can still run in a degraded state, just a bit slower.

But don't get into the habit of removing and replacing drives whenever you feel like it with RAID5 - reading 1TB of data off a hard drive pretty much guarantees at least 1 bit incorrect with today's error rates. So when reading off of 3 1TB drives to rebuild the 4th, that's going to be 3 or so incorrect bits. If you have a lot of multimedia you probably won't notice that it happened (would you notice the color of a single pixel of a single frame of 30FPS video was slightly off?), but you never know if it might change something important.

If you run RAID6 you're pretty safe though, because there's still the second set of parity that the data gets checked against. Unfortunately the Perc5 doesn't do RAID6.
The array will have the 4 3200AAKS drives I have atm in it
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post #3267 of 7276
Quote:
Originally Posted by Starbuck5000 View Post
The array will have the 4 3200AAKS drives I have atm in it
Ok then you're likely to get 1 incorrect bit per rebuild. It's not a big deal, just something to be aware of.
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post #3268 of 7276
Quote:
Originally Posted by Manyak View Post
Yes, it's called rebuilding. And even while the 4th drive isn't installed it can still run in a degraded state, just a bit slower.

But don't get into the habit of removing and replacing drives whenever you feel like it with RAID5 - reading 1TB of data off a hard drive pretty much guarantees at least 1 bit incorrect with today's error rates. So when reading off of 3 1TB drives to rebuild the 4th, that's going to be 3 or so incorrect bits. If you have a lot of multimedia you probably won't notice that it happened (would you notice the color of a single pixel of a single frame of 30FPS video was slightly off?), but you never know if it might change something important.
That's not entirely accurate... The Non-recoverable Read Error Rate for several of the drives I looked up (WD Caviar Green & Samsung EcoGreen F2) are rated for <1 in 10^15 bits read and 1 in 10^15 bits read respectively. The WD Caviar Black are rated for <1 in 10^14 bits read.

1 in 10^15 bits is 1 per 125TB (base-10) read, and 1 in 10^14 bits is 1 per 12.5TB (base-10) read. You would need an array of ~14 1TB 7200RPM drives (rated 1 NRE in 10^14 bits read) to "guarantee" a single bit error occurring between all the drives during a rebuild because you read n-1 drives worth of data where n is the number of drives.
post #3269 of 7276
Quote:
Originally Posted by Starbuck5000 View Post
The array will have the 4 3200AAKS drives I have atm in it
WD rates the NRE for that drive as <1 in 10^15 bits read. So, if we assume it's 1, not <1, and you have an array of 4 of them... During a rebuild the array reads 960GB (base-10) of data and you need to read 125TB (base-10) of data to hit that magic 1 number. So, your odds of getting a NRE / UBE during a rebuild is .768%. Further, if you enable regular read patrols on the Perc 5/i you also improve your odds because the controller would likely find and mark the bad sector and take it out of play prior to your rebuild discovering it and it causing data loss.
post #3270 of 7276
Hello, I first posted some of this 4 weeks ago and received zero feedback. I have just purchased a 6/i from borito4 and am waiting for it to arrive. I know this is the definitive PERC forum and I have read many many pages of this thread and still have some questions.
I built a home server with an Asus A8N-SLI Premium with an AMD 3000 chip running WinServer2003 Enterprise. This is not used for apps, more for home computer (4) system backup and as a file server. Four computers access this server but almost never at the same time.

Drives:
2 36 GB raptor in Raid 1 (onboard, OS Drive)
4 320 GB Seagate ES drives in Raid 5 (onboard, used for images of networked computer’s OS drives)
I also have 4 1.5 TB Seagate drives (upgraded firmware, not installed) that I would like to run in Raid 5 for Media storage (DVD rips, MP3, etc.).

Questions:
1. Should I upgrade the computer for this setup (EP45-UD3P, E5200)?
2. Do I keep the 2 raptors in Raid 1 onboard or swap it out for 1 74gb I have laying around and eliminate onboard Raid?

I think that is it, any help would obviously be greatly appreciated, thanks!
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