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PERC 5/i RAID Card: Tips and Benchmarks - Page 324

post #3231 of 7276
Is is possible to have this card manage arrays with more than 8 drives? If so, how? I apologize if this is a newb question. I haven't been able to find an answer with searching.
post #3232 of 7276
Quote:
Originally Posted by tkole View Post
Is is possible to have this card manage arrays with more than 8 drives? If so, how? I apologize if this is a newb question. I haven't been able to find an answer with searching.
Yes, you can manage arrays with more than 8 drives by using a SAS expander. A SAS edge expander allows for communication with up to 128 SAS addresses
    
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post #3233 of 7276
Should I buy a spare Perc 5i in case my card dies?

The thing that scares me about RAID arrays in general is that if the card dies (or something else happens to the array) that you can lose all of your data instead of just one or two drives. However, the advantage of more drive space (compared to RAID-1 or Windows Home Server, etc) and the advantage of faster access times is pretty nice.

Also, how much do those SAS expanders cost?
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post #3234 of 7276
Quote:
Originally Posted by DJZeratul View Post
Yes, you can manage arrays with more than 8 drives by using a SAS expander. A SAS edge expander allows for communication with up to 128 SAS addresses
Quote:
Originally Posted by sofakng View Post
Also, how much do those SAS expanders cost?
You can find Chembro SAS expanders on ebay for little more than 300 euro. Other brands costs from 600$ to over 1000$ for a 24-28 ports.

Before to buy a SAS expander, check 3 things:

1) there are some incompatibilities between some controller cards and some SAS expanders. Check if the specific expander works with the perc.

2) the 128 drives is a max generic value. Some cards have a lower limit. Some cards can hosts 128 drives, but only a lower number of drives can be assigned to a single volume. Check the specs for the perc.

3) The perc can work with SATA drives attached using a SAS Expander. This isn't always true. Check if there are compatibility problem if you use SATA drives.
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post #3235 of 7276
Doh. That's way more than I can afford. It looks like 8 drives by controller for me

Any opinions my question regarding a spare/backup Perc 5i controller?

How often do these controllers go bad anyways? (and do they typically take out the array when they go bad?)
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post #3236 of 7276
Quote:
Originally Posted by sofakng View Post
Any opinions my question regarding a spare/backup Perc 5i controller?
You could get a cheaper RAID controller if it was just for adding more storage.

Quote:
Originally Posted by sofakng View Post
How often do these controllers go bad anyways? (and do they typically take out the array when they go bad?)
Not to often.

Consider this, my old PERC 4 cards are still working just fine. And I've never seen a PERC5 die.

Once I saw one with a RAM problem. But that's and easy fix.
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post #3237 of 7276
Thread Starter 
Quote:
Originally Posted by nightyy View Post
1) Does the PERC 6/i recognize the Intel X25-M?
2) I heard of random dropouts of those drives from the arrays, is that true?
Yes, the PERC 6/i can recognize the X25-M. Just note that the throughput is limited to about 1GB/s.

Search in this thread for SSDAddict's posts. I believe he had a server with X25-Ms.

Quote:
Originally Posted by sofakng View Post
How often do these controllers go bad anyways? (and do they typically take out the array when they go bad?)
Since these are server grade parts, they should last relatively long.
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post #3238 of 7276
Results are all on 256KB Stripe + No Read Ahead. My SuperTalent SSDs were flashed to the latest firmware available on their site. Adaptive Read Ahead seems to lower my results and increase access times....though I suspect that might have to do with the Perc 5/i not really being suited for SSDs since its using an IOP333 processor @ 500MHz.



My original intention was to make a bang/buck SSD array. I got these SSDs before Vertex came out, so I made with what I had available.

No tweaks yet, just straight Win7 Ultimate x64 install. No stuttering from what I've seen so far, but this is going to be for OS / Games / Apps, no heavy writing...so I'm not really too dissapointed for the write results as this is going to be primarily read only. Even with JCrap drives, things are pretty damn snappy. Win7 Performance Index is 7.6.
post #3239 of 7276
Thread Starter 
Quote:
Originally Posted by Miwo View Post
Results are all on 256KB Stripe + No Read Ahead. My SuperTalent SSDs were flashed to the latest firmware available on their site. Adaptive Read Ahead seems to lower my results and increase access times....though I suspect that might have to do with the Perc 5/i not really being suited for SSDs since its using an IOP333 processor @ 500MHz.



My original intention was to make a bang/buck SSD array. I got these SSDs before Vertex came out, so I made with what I had available.

No tweaks yet, just straight Win7 Ultimate x64 install. No stuttering from what I've seen so far, but this is going to be for OS / Games / Apps, no heavy writing...so I'm not really too dissapointed for the write results as this is going to be primarily read only. Even with JCrap drives, things are pretty damn snappy. Win7 Performance Index is 7.6.
So the onboard PERC cache does eliminate stuttering?
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post #3240 of 7276
Quote:
Originally Posted by DuckieHo View Post
So the onboard PERC cache does eliminate stuttering?
Can't really conclusively say. Im sure the cache helps, along with having the latest firmware on the SSDs. I will know for sure in the next few months when I start installing stuff, playing games, actually using the system, etc. but from what I see so far, no stutters yet
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