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PERC 5/i RAID Card: Tips and Benchmarks - Page 216

post #2151 of 7194
hi

first test ... same 4x Hitachi HDS721616PLA380
  • PERC 5/i, 256MB cache, ARA, WB, IO Policy - Cached IO, 128KB stripe, 8K or 16K formatted allocation unit
  • ICH10R - 32K stripe size, 4K formatted allocation unit
in both cases Enabled Advanced Performance in cache policies

and results below:


of course if we cut PERC's partition to ICH10R size - average read will be the same ...
and Random Access is 15ms because PERC need to access slowest end of drives, right ?

I'm waiting for processing my order of HD Tune Pro to make additional tests to compare with this:

http://www.overclock.net/hard-drives...ml#post5921897

4KB SectorSize (system), 32KB StripSize (raid), 64KB BlockSize (HD Tach)



but ... I think PERC 5/i should have better results ... or drives are really so slow ?

why Burst Speed is 4x slower ?

what tests I should run on these drives to see real performance improvement from PERC ? or they are so slow that nothing will help ?

Everest show me that my video card and PERC works @8x
post #2152 of 7194
ICH9R burst read speed is that high because system RAM is used as the cache - so its directly related to your RAM speed.

And the difference in random access times is most likely due to those hitachi hard drives.
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post #2153 of 7194
does this card insert into the PCI ports or what?
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post #2154 of 7194
Quote:
Originally Posted by iFresh
does this card insert into the PCI ports or what?
PCI-Express - go to first post in this thread
post #2155 of 7194
Quote:
Originally Posted by utnorris View Post
Ok, so a few opinions needed. If my goal is for an OS drive/array with speed the most important and redundancy/size the least since this is the OS, what do you guys think would be the best:

3 x Velociraptors (150Gb) Already have 2, just need a third or fourth one.
4 x WD Black 640Gb - Heard these were pretty fast when put in a RAID array.
4 x Seagate 36Gb 10K SAS drives - Have these already.
3 x Seagate 146Gb 15K/10K SAS drives - These are 15k RPM, 10K performance whatever that means.

Thinking RAID 0 in all scenarios, maybe RAID 5, but again, I am looking for raw speed. I have the PERC 5i by the way. Also, SSD is currently out of it due to costs.

Thanks

P.S. On my previous issue with the two 146Gb SAS dri
es not spinning up, both dead. I tried them on a friends box and same results. I am not sure how 2 drives goes out at the same time but they did.
If all you looking for is speed I say 4 SSD in Raid 0, or if money is a concern I would get a couple more Velociraptors and run them in raid 0.
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post #2156 of 7194
Is this whole 'over 4TB' thing PER VD, or total on the card? But as i gather this corruption issue is real?
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post #2157 of 7194
Quote:
Originally Posted by zha50 View Post
Is this whole 'over 4TB' thing PER VD, or total on the card? But as i gather this corruption issue is real?
I don't know. Only one person claimed corruption, and had no proof, and only fired back hatespeak when asked for proof... After awhile he posted some corrupted sectors and that is something to worry about, but, I dont think there was any conclusive evidence it wasn't a filesystem error instead of a problem with the PERC. So until there is solid proof, I am not sure if it is real or not.
    
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post #2158 of 7194
I see. I have 90% of the data on my R5 on DVD as backup, so it SHOULD be OK if anything happens.

What I might do is a MD5 hash on the DVD media and array data to see any differences periodically. Most of my files have been CRC tagged, but they are only 8bit long.
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post #2159 of 7194
I wasn't going to take a chance. I don't have any way to back up 3.6TB of data currently.
 
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post #2160 of 7194
Got write ECC error again. Waiting on a 512mb stick. Looks like it is the stick, as it only does it on shutdown after having written data. Only got 1 error though, so hopefully everything is ok.

Shouldn't it finish writing everything before I shut the PC down though? Like if the PC has sat idle for some time it should have done its job and hence the monitor produce an error?
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