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Operating Systems Linux Red Hat Separate HDD test using RAID controller Post 302945626 by hicksd8 on Monday 1st of June 2015 06:10:22 AM
Old 06-01-2015
If you have identical machines with different RAID I/O performance the first thing to do is compare the RAID controller parameter settings. Yes, it could be a rogue hard drive but it's more likely to be the configuration.

Adaptec RAID controllers have all kinds of parameters which can be configured using the BIOS setup or other Adaptec provided tools. I suggest that you compare, parameter by parameter, the settings of poor performing RAID controller with a good performing RAID controller.

In particular, I would be looking at the cache setup. (Use Google to read about cache (i) write-through, (ii) write-around, and (iii) write-back. That setting will most definitely greatly affect performance.)

Also, Google for "Adaptec RAID cache" to read what they say about setting the cache; the pro's and the con's.

Also, of course, search THIS FORUM for threads about this subject as you will learn personal opinions and benefit from tons of experience available on here.

Repeat, if possible, compare all the settings on the Adaptec cards one by one.

Hope that helps. Let us all know how you get on with this.

Last edited by hicksd8; 06-02-2015 at 07:01 AM..
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AAC(4)							   BSD Kernel Interfaces Manual 						    AAC(4)

NAME
aac -- Adaptec AdvancedRAID Controller driver SYNOPSIS
aac* at pci? dev ? function ? ld* at aac? unit ? DESCRIPTION
The aac driver provides support for the Adaptec AAC family of SCSI and SATA RAID controllers. These controllers support RAID 0, 1, 5, 10, and volume sets. They have four channels in the add-in version or 1-2 channels in the motherboard integrated version, and are most often found rebadged by Dell, Hewlett-Packard or IBM. Supported controllers include: o Adaptec AAC-364 o Adaptec SCSI RAID 2120S o Adaptec SCSI RAID 2200S o Adaptec SATA RAID 2410SA o Adaptec SATA RAID 3405 o Adaptec SCSI RAID 5400S o Dell PERC 2/Si o Dell PERC 2/QC o Dell PERC 3/Di o Dell PERC 3/Si o Dell PERC 320/DC o Dell CERC SATA RAID 1.5/6ch o HP NetRAID 4M o HP ML110 G2 (Adaptec SATA RAID 2610SA) o IBM ServeRAID 8k Access to RAID containers is available via the ld device driver. Individual drives cannot be accessed unless they are part of a container or volume set, and non-fixed disks cannot be accessed. Containers can be configured by using the on-board BIOS utility of the card. DIAGNOSTICS
The adapter can send status and alert messages asynchronously to the driver. These messages are printed on the system console. SEE ALSO
intro(4), ld(4) HISTORY
The aac driver first appeared in NetBSD 1.6, and was based on the FreeBSD driver of the same name. BUGS
This driver is not compatible with controllers that have version 1.x firmware. The firmware version is the same as the kernel version printed in the BIOS POST and driver attach messages. BSD
February 19, 2011 BSD
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