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Slow Sequential Read on RAID 1 ??? Why?

X

XeoNoX

n00b
Joined
Dec 22, 2011
Messages
10
I have a Intel 2500K Process and a 3TB RAID 1 on a 2 x SATA 3Gb/s Port on a Intel® Rapid Storage Technology RAID ARRAY. Im using the 3TB RAID 1 ARRAY for storage and im using a Crucial M4 128GB drive for my primary boot drive. My M4 drive operates normal good speeds. However on my RAID 1 ARRAY Ive noticed my Sequential Read speeds are slow (compared to what they should be), or at least they seem slow to me because im not sure if it is normal but my Sequential Read is around 75MB/s and the Sequential Write is around 140 MB/s which seems normal for the write but not for the READ. BEFORE i did any RAID the SEQ READ/WRITE were both around 120-140 for both drives. why is it that my READ speed is so slow after i did a RAID 1?? I've attached my CrystalDiskMark log below. My 3TB RAID 1 array are using a Seagate ST3000DM001 and a Seagate ST33000651AS



-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo
Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 73.481 MB/s
Sequential Write : 140.259 MB/s
Random Read 512KB : 49.253 MB/s
Random Write 512KB : 89.153 MB/s
Random Read 4KB (QD=1) : 0.728 MB/s [ 177.7 IOPS]
Random Write 4KB (QD=1) : 1.233 MB/s [ 300.9 IOPS]
Random Read 4KB (QD=32) : 3.247 MB/s [ 792.7 IOPS]
Random Write 4KB (QD=32) : 1.271 MB/s [ 310.3 IOPS]

Test : 500 MB [E: 33.6% (938.8/2794.4 GB)] (x2)
Date : 2012/02/22 8:51:38
OS : Windows 7 Ultimate Edition SP1 [6.1 Build 7601] (x64)
 
Last edited:
Do any of the drives have UREs? Look at the SMART for that. CrystalDiskInfo will tell you. Also make sure nothing else is reading from the disks during the benchmark. Sometimes antivirus software or indexing can interfere with your ability to benchmark.

Edit: You probably will not get SMART access in CrystalDiskInfo to your individual disks. Sorry.
 
nothing is writing/reading from the drive when i ran the benchmark, antivirus is off, its practically a 2 day new install of windows 7
 
quick format using default settings, they were both brand new drives i bought 3 days ago, i partitioned them using windows 7 sp1 64 bit and i setup the raid in the INTEL RAID CONTROLLER ROM/BIOS
 
At work for some new drives I have seen unreadable sectors on sectors that were never written by me to causing a low read scores. A full format to the drive cleared up this in most cases.

they were both brand new drives i bought 3 days ago
Click to expand...

Remember drives can and will die at any time regardless of your usage even brand new ones. Although I would suspect that most DOA drives are caused by the shipper mistreating your shipment..
 
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