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Unusual drop in write speeds in RAID0

post #1 of 3
Thread Starter 
Hai guys, long time no see biggrin.gif

I'm in a tangle here, few days ago I got a new set of hard drives, upgraded from a couple of 10KRPM 146GB 6Gbps to 4 450GB 15KRPM 6Gbps... Can't say no to one of a kind deals thumb.gif

Thing is, I backed up everything from my previous set up, destroyed the current array and set up a new RAID0 with all 450's then restored the backup onto them. Everything was fine and dandy, benchmarks were as supposed (read and write speeds went from about 200MB/s to about 700MB/s).

After rebooting my computer, I wanted to give another try at benchmarks, the results were ridiculously different, read speeds kept basically the same but write speeds went down to as low as 40MB/s. Yesterday I tried again, deleted the arrays, restored the backup and this is the result...311

Read speeds on HD Tune varied from 700MB/S to 740MB/s, write speeds were pretty consistent always around 550~560MB/s, on CrystalDiskMark, read varied between the same range as HD Tune and write speeds varied between 690 and 720MB/s on sequential. By the way, do these values seem on par for such hard drives/raid card?


Today I gave another shot on the benchmarks, and this is the result...
306

Read Speeds are strangely higher but not by much, but write speeds in both benchmarks are always between 40 and 45MB/s (Not even considering 4k random... as that is expected, but there's also a drop). And HD Tune refuses to test 4KB random multi 32 for some reason. Also adding up, the ludicrous drop in IOPS.


My RAID card is an LSI MR 9264-8i 256MB cache. Array settings are as followed for both benchmarks:
128KB Strip size (64KB was the same results),
Read policy: No read ahead
Disk cache policy: enabled
IO Policy: cached IO
Write policy: write through


Updating controller drivers yielded in no change, testing outside of windows also resulted in the same slow write speeds...


I'm at a stump... hell... last thing that's left for me to do is try on a fresh windows installation. But I kind of ruled that out since it works well once...

Oh and sorry for the long text lol, I want you guys thoroughly informed xD


Cheers
cheers.gif
紅白 [Kōhaku]
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円相 [Ensō]
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紅白 [Kōhaku]
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円相 [Ensō]
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post #2 of 3
Sorry i can't fully help but i just wanted to tell you that a mixture of different HDD benchmarking software will often show difference results to each other even if it is doing a similar test.

Also it is common to see lower write speeds at times. This is when the HDD is being tested in an area that contains information.
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by BradleyW View Post

Sorry i can't fully help but i just wanted to tell you that a mixture of different HDD benchmarking software will often show difference results to each other even if it is doing a similar test.
Also it is common to see lower write speeds at times. This is when the HDD is being tested in an area that contains information.

Well, yes, but that's not the problem, I know it's normal for different benchmark applications to show different results.

The issue is that on a fresh created array and on the first boot of windows right after restoring the HDD image, the write speeds are, as you can see on the first screen shot, great! After a reboot or power off and then on the next day power on (on this case) the write speeds have a ridiculous drop with no apparent reason.

I'm perfectly sure that is not normal for write speeds to drop about 500MB/s on HD Tune and about 660MB/s on CDM after just a reboot or power off/power on cycle. I've tried defragmenting, check disk, removing the RAID1 array out and reinstalling drivers, but no change.

Even a single Seagate 250GB 7200.12 can write at about 75MB/s and just short of 400IOPS and 91% full. This is really killing me, all there's left for me to do is a clean install...

Cheers
紅白 [Kōhaku]
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円相 [Ensō]
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Kingston HyperX Beast 2133MHz 2x4GB 2x Micron C400 (Crucial m4) 256GB RAID0 2x Seagate 250GB 2.5" 7200RPM RAID1 EK Supremacy Nickel + Plexi 
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紅白 [Kōhaku]
(20 items)
 
円相 [Ensō]
(16 items)
 
CPUMotherboardGraphicsGraphics
Core i5 3570k @ 4.5GHz - 1.29v Maximus V Formula / Thunder FX EVGA GTX 670 @1333/6500 (Unlocked BIOS) EVGA GTX 670 @1249/6500 (Unlocked BIOS) 
RAMHard DriveHard DriveCooling
Kingston HyperX Beast 2133MHz 2x4GB 2x Micron C400 (Crucial m4) 256GB RAID0 2x Seagate 250GB 2.5" 7200RPM RAID1 EK Supremacy Nickel + Plexi 
CoolingCoolingCoolingOS
2x EK FC GTX670 CSQ Phobya Xtreme 400 v2 Alphacool NexXxos XT45 240 Windows 8.1 Pro x64 
MonitorKeyboardPowerCase
Dell U2913WM 2560x1080 Logitech G15 v2 Orange Zalman ZM850HP (850w) Corsair Graphite 600T SE 
MouseMouse PadAudioAudio
Steelseries Sensei Steelpad 5L Logitech Z5400 @ Supreme FX IV Razer Tiamat 2.2 @ Supreme FX IV 
CPUMotherboardGraphicsRAM
AMD A6-5400B @ 3.6GHz Gigabyte F2A88XN-WIFI AMD 7540D 4GB DDR3 1333MHz 
Hard DriveHard DriveOptical DriveCooling
Western Digital Velociraptor 150GB RAID1 1TB Seagate Barracuda ES.2 Samsung DVD-RW DL Noctua NH-C12P 
OSMonitorKeyboardPower
Windows 8.1 Pro x64 32" Sony Bravia LED KDL32-EX710 1920x1080 Logitech LX710 192W AC-DC adapter + 160W DC-DC Pico PSU 
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