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PERC 5/i RAID Card: Tips and Benchmarks - Page 204

post #2031 of 7150
Quote:
Originally Posted by devsk
But there are too many layers involved and too many parameters to say with a guarantee that your 20MB file will be in cache when you read that big 2GB file. OS caches your Filesystem info, so that gets driven by how much RAM you have and how many other programs are active. That also gets tied into whether you are swapping (writing page file) or not. Larger programs may generate page file traffic. NTFS itself is generating log file writes to the disk periodically (and it looks more aggressive than most other FSs I know).
Vista 64bit, 8GB RAM, no swap file
"clean" system (no emule, no torrents, no "install any program you can download" ) VB6 IDE + one/two 5-50 MB test files
post #2032 of 7150
Anybody else get ECC errors only if they've left the machine off for a period of time? So far that seems to be the go with mine, I think its BBU related.
post #2033 of 7150
Quote:
Originally Posted by Manyak View Post
That's not entirely true. Cache is actually very helpful when dealing with large files.

Lets use some numbers that are easy to work with here - say you wanted to copy a 1GB file from array A (500MB/s read) to array B (100MB/s write). If it was a straight copy (no cache), it would be limited by the write speed and therefore take 10 seconds. If you have 256MB cache, the first 768MB would take 7.6 sec, and by the time that much has been transferred the cache will hold the last 256MB that was read from the drive. So you just 'saved' 2.4 sec. If you have 512MB cache, then you only have to wait on the first 512MB, which takes 5.1 sec. Saving you another 2.5 sec.
if array B is limited to 100MB/s write speed how can get faster speed? Please explain more how controller cache work.
post #2034 of 7150
Quote:
Originally Posted by dog_dog
if array B is limited to 100MB/s write speed how can get faster speed? Please explain more how controller cache work.
no you will get quicker response from system - but writing will countinue from cache in backround
post #2035 of 7150
Quote:
Originally Posted by RobiNet View Post
no you will get quicker response from system - but writing will countinue from cache in backround
but it is useful only if system has a lot of read/write operations?
post #2036 of 7150
How are these benchmarks for my perc card? I am running the latest dell firmware with the latest dell drivers in vista x64. The first screenshot of of 3 WD black 1TB hdds in raid5 with read ahead, and the second screenshot is of 2 samsung F1 1TB hdds in raid0 with read ahead. Are these good?

post #2037 of 7150
Quote:
Originally Posted by FoxRacR17 View Post
How are these benchmarks for my perc card? I am running the latest dell firmware with the latest dell drivers in vista x64. The first screenshot of of 3 WD black 1TB hdds in raid5 with read ahead, and the second screenshot is of 2 samsung F1 1TB hdds in raid0 with read ahead. Are these good?
I don't think so ... you should have better results ...
post #2038 of 7150
Quote:
Originally Posted by RobiNet View Post
I don't think so ... you should have better results ...
This looks somewhat like a single 7200.10 drive's results... The benchmark is a little better but not much better.
    
CPUMotherboardGraphicsRAM
Core i7 970 ASUS P6T Deluxe eVGA GTX 680 6x4GB Kingston Hyper X DDR3-1600 
Hard DriveOptical DriveOSMonitor
Boot R0: 2x256GB Corsair SSD; Scratch R0: 3x750GB Samsung 22x LightScribe DVD+/-DL [SATA] Windows 7 x64 Ultimate Dell 2407FPWx2 
KeyboardPowerCaseMouse
Microsoft Sidewinder X6 Antec TruPower Q 1KW Custom Fabricated 18" cube (Mountain Mods UFO) Logitech G9 Laser 
Mouse Pad
Faux Woodgrain (My Desk) 
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CPUMotherboardGraphicsRAM
Core i7 970 ASUS P6T Deluxe eVGA GTX 680 6x4GB Kingston Hyper X DDR3-1600 
Hard DriveOptical DriveOSMonitor
Boot R0: 2x256GB Corsair SSD; Scratch R0: 3x750GB Samsung 22x LightScribe DVD+/-DL [SATA] Windows 7 x64 Ultimate Dell 2407FPWx2 
KeyboardPowerCaseMouse
Microsoft Sidewinder X6 Antec TruPower Q 1KW Custom Fabricated 18" cube (Mountain Mods UFO) Logitech G9 Laser 
Mouse Pad
Faux Woodgrain (My Desk) 
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Reply
post #2039 of 7150
I'd say thats about right for latest Dell firmware, as thats basically what I was getting. If you want the extra kick, go the LSI firmware.
post #2040 of 7150
3 weeks ago i got my perc 5i off ebay and it had been running smoothly. i did add extra cooling for the chip. anyway when i got home from work on friday the system was off - im not sure how it turned off but it had been up for 3 weeks. when i powered it back up the raid card was not detected. it goes straight to the OS boot menu after POST, and i dont see the perc bios screen anymore. i removed it and reinstalled it and still no go. unfortunately the motherboard is microatx and doesnt have any other slots that i can try it in. it has been getting hotter here so is it possible it got burned out or something?
Storage
(13 items)
 
  
CPUMotherboardRAMHard Drive
Q8200 MSI P7NGM GSkill 2x2GB DDR2-800 4x WD Black 1TB 
OSPowerCase
Ubuntu 11.10 Rosewill 400W Antec Mini P180 
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Storage
(13 items)
 
  
CPUMotherboardRAMHard Drive
Q8200 MSI P7NGM GSkill 2x2GB DDR2-800 4x WD Black 1TB 
OSPowerCase
Ubuntu 11.10 Rosewill 400W Antec Mini P180 
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