Slow /dev/sda ?

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bluegroper
Posts: 245
Joined: 2005/09/07 23:04:21
Location: .au

Slow /dev/sda ?

Post by bluegroper » 2015/01/02 10:39:20

Hi forum
I just installed C7 and noticed some strangenes.
I have 2 x identcal drives in "hardware" (enabled in BIOS) Raid 1.

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# smartctl -i /dev/sda
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-123.el7.x86_64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     WDC WD5003ABYZ-011FA0
Serial Number:    WD-WMAYP7518689
LU WWN Device Id: 5 0014ee 059158882
Firmware Version: 01.01S03
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    7200 rpm
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   ATA8-ACS (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    <snipped>
SMART support is: Available - device has SMART capability.
SMART support is: Enabled 
SATA 3.0 appears enabled, BUT hdparm reports only

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hdparm -t /dev/sda

/dev/sda:
 Timing buffered disk reads: 384 MB in  3.01 seconds = 127.41 MB/sec 
Seems nowhere close to ~ 6.0 Gb/s.
Is this apparent slowness normally expected ?

TIA's
I'm not a complete idiot. There's still a few pieces missing.

pwd
Posts: 61
Joined: 2014/12/23 11:54:42

Re: Slow /dev/sda ?

Post by pwd » 2015/01/02 11:05:16

6.0 Gb/s it's speed for sata interface (check on wiki), hdparm check speed for hard disk drive.
If You have 2 disk You can confgiure them in software raid (enable this option in bios is not enought).
Speed on this hdparm test it's ok.
"God, root, what is difference?"

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