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PERC 5/i RAID Card: Tips and Benchmarks - Page 217

post #2161 of 7149
Quote:
Originally Posted by rampage101 View Post
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?
Its going to keep your cache filled until the cache flush interval, so... yes, if you let it sit for awhile it should have flushed the cache out to disk.
    
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post #2162 of 7149
i just got my perc 5/1 today and have my 4 500gb drives in raid 5. what should i set the strip size at for the array? as well as any other settings you guys think i might need to set
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post #2163 of 7149
Quote:
Originally Posted by opty165 View Post
i just got my perc 5/1 today and have my 4 500gb drives in raid 5. what should i set the strip size at for the array? as well as any other settings you guys think i might need to set
LSI or DELL firmware on that?
    
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post #2164 of 7149
LSI now
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post #2165 of 7149
OK. This drive is for storage right? 256K or 512K for storage drives is a good medium. As you lower the stripe size, write speed begins to increase, but read speed decreases. i found the best window for a good combination of reads and writes for a storage drive is 256 or 512.

For settings, use Cached IO, Always Read Ahead, and Write Back. Drive policy should be Cache Enabled.

Best thing to do is test and see which settings work best for you, but start with those values and then change a variable at a time and do benchmarks and see what you get.
    
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post #2166 of 7149
Quote:
Originally Posted by DJZeratul View Post
OK. This drive is for storage right? 256K or 512K for storage drives is a good medium. As you lower the stripe size, write speed begins to increase, but read speed decreases. i found the best window for a good combination of reads and writes for a storage drive is 256 or 512.
What would be a good stripe size for a boot disk?
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post #2167 of 7149
Thread Starter 
Quote:
Originally Posted by vannguyen0 View Post
What would be a good stripe size for a boot disk?
64K or 128K would be fine.
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post #2168 of 7149
Quote:
Originally Posted by vannguyen0 View Post
What would be a good stripe size for a boot disk?
I use 64K and it works well.
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post #2169 of 7149
Ok, so I am pretty sure I am missing something setting wise. I am using 4 x 36Gb SAS 10K Seagate drives in a RAID 0 array. I am currently using the Dell FW 1.03.10 and settings are to default, meaning 64k stripe, write back. Here are my results using HDtune:



It seems a little eratic and Everest read suite gives me way better results. Any ideas?
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post #2170 of 7149
Quote:
Originally Posted by vannguyen0 View Post
What would be a good stripe size for a boot disk?
Actually, as low a you can take it. Lower values lead to more IOs but better spread across your disks. Higher values lead to less IOs but you don't get the benefits of RAID0 for smaller files.

Since a boot drive is mostly about small file random access pattern and is by default using 4k cluster size, I would say set your stripe as low as possible for the boot drive i.e. try various values, start from 64k, check boot up times, app startup times and then check your sequential throughput numbers (in ATTO or in crystal disk mark). Keep going down as long as ATTO and crystal scores don't become alarmingly (10%) lower for higher block sizes.

From my experience, 16k stripe is best bang for buck for a boot drive.

For a media drive (large files, sizes in MBs mostly), use 128k stripe (for compatibility with dell firmware, because if you HAVE to go back to Dell firmware to troubleshoot something, you don't want to lose the whole array).

PS: BTW, I would rather not use Perc as my boot device because there are too many failure paths. Most of the times, you need OS to troubleshoot issues. Use onboard sata with a fast SSD device (like 30G vertex or something like that) as a boot device. You will be much happier...
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