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Operating Systems Linux Help Setting up Linux Raid Server Post 302518456 by DGPickett on Friday 29th of April 2011 04:54:35 PM
Old 04-29-2011
Often, the bootstrap is on a simple disk, and the RAID is dedicated to the application. For software RAID, I wonder if that is a requirement, since you need to boot the software to get it together. Remember that raid5 is not churn-friendly or small-block-random efficient, so many shops put high-churn and small block-random data on mirrors, sometimes striped for more bandwidth. Also, the controller(s) can be a bottleneck. Even with lots of RAM, random operations on large data sets will fill RAM uselessly, and fsync() of RDBMS Commit and other critical files (postfix email) waits for magnetic completion. A shot of SSD might be a great complement. Sometimes, you can shadow the SSD with RAID5 hierarchically, so only the most accessed bits move to SSD. Too much modified data in RAM in a liability!
 

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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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