12-30-2011
Best RAID settings for Debian Server? Help!! (1+0 or 5 or NAS)
I am installing a Debian Server on a:
HP Proliant DL380 G4
Dual CPU's 3.20 ghz / 800 mhz / 1MB L2
5120 MB RAM
6 hard disks on HP Smart Array 6i controller (36.4 GB Ultra320 SCSI HD each)
I will be using this server to capture VHS video, encode, compress, cut, edit, make DVD's, rip DVD's, re-encode some more, generally convert large uncompressed files as routine.
I have options:
#1) RAID set to RAID 5 (5 discs) with one spare (6th disk)
I liked this option, because of the spare. My disks are getting older, then are going to brake down, and I really need redundancy. However, I thought the parity processing would really slow down the encoding process. !!!
#2) RAID 1+0
I thought this would be faster, but I can either do 4 disks mirrored (leaves me really two disks size of 36.4GB x2)... Then I would have 1 spare, and one SCSI disk not being used sitting in the server. (some what of a waste, unless I need a quick replacement).
With RAID 5 I have 5 disks @ 36.4GB each and 1 spare
OR
With RAID 1+0 I have 2 disks @ 36.4GB each but I have two spares and mirroring.
I am also considering purchasing a NAS.
Given these scenarios (RAID 5...RAID 1+0....either 5 or 1+0 using a NAS)
What is the best configuration for my needs?
Thank you.
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ASR(4) BSD Kernel Interfaces Manual ASR(4)
NAME
asr -- driver for Adaptec I2O based SCSI/ATA host bus adapters
SYNOPSIS
device asr
DESCRIPTION
The Adaptec asr driver provides access to disks and disk arrays controlled by I2O based host bus adapters and SmartRAID SCSI RAID adapters
through the standard SCSI disk da(4) interface.
The supported adapters provide 64 bit PCI, Compact PCI, Zero Channel PCI, and up to four channels of Ultra2, Ultra 160, or Ultra320 SCSI, or
two channels of 1GB Fibre. All support RAID-0, RAID-1, RAID-10, RAID-5 and RAID-50 arrays. All SCSI target types are supported. For the
ATA based controllers, one IDE drive per channel is supported. Hot-swapping of IDE drives is not supported at this time.
All host bus adapters must be configured before they can be used with any operating system. Please contact Adaptec directly to obtain the
latest information on configuration utilities for the adapters. Currently there are both a Motif based GUI configuration utility and a CLI
based configuration utility available from the Adaptec Web site. The cards and arrays can also be configured via the BIOS based configura-
tion tool (SMOR).
HARDWARE
The adapters currently supported by the asr driver include the following:
o Adaptec Zero-Channel SCSI RAID 2000S, 2005S, 2010S, 2015S
o Adaptec SCSI RAID 2100S, 2110S
o Adaptec ATA-100 RAID 2400A
o Adaptec SCSI RAID 3200S, 3210S
o Adaptec SCSI RAID 3400S, 3410S
o Adaptec SmartRAID PM1554
o Adaptec SmartRAID PM1564
o Adaptec SmartRAID PM2554
o Adaptec SmartRAID PM2564
o Adaptec SmartRAID PM2664
o Adaptec SmartRAID PM2754
o Adaptec SmartRAID PM2865
o Adaptec SmartRAID PM3754
o Adaptec SmartRAID PM3755U2B / SmartRAID V Millennium
o Adaptec SmartRAID PM3757
o DEC KZPCC-AC (LVD 1-ch, 4MB or 16MB cache), DEC KZPCC-CE (LVD 3-ch, 64MB cache), DEC KZPCC-XC (LVD 1-ch, 16MB cache), DEC KZPCC-XE (LVD
3-ch, 64MB cache) -- rebadged SmartRAID V Millennium
FILES
/dev/asr* Adaptec SCSI RAID control nodes
NOTES
The ATA based controllers present their devices as SCSI-like devices via CAM. For IDE drives attached to these cards, a subset of standard
SCSI commands and mode pages are understood via translation performed in the card's firmware.
SEE ALSO
da(4)
HISTORY
The asr (Adaptec SCSI RAID) driver first appeared as the dpti2o driver under BSDi BSD/OS 3.2, then under FreeBSD 2.2.8 and was ported over to
the CAM layer represented in 4.0.
AUTHORS
The asr driver was kindly donated by Adaptec and is maintained by Mark Salyzyn <mark_salyzyn@adaptec.com>. This manual page was written by
Mark Salyzyn and fixed up by Jeroen Ruigrok van der Werven <asmodai@FreeBSD.org>.
BSD
July 14, 2004 BSD