[nmglug] RAID5 - ATA vs SATA

[Tim Emerick]

That's a pretty interesting statement.  I can usually get a good 70mbs throughput when reading large files.


----- Original Message ----
From: Bill York <iago at pobox.com>
To: NMGLUG.org mailing list <nmglug at nmglug.org>
Sent: Friday, December 1, 2006 3:31:13 PM
Subject: Re: [nmglug] RAID5 - ATA vs SATA

btw, 100mb is the theoretical throughput. you'll never see more than about 40mb, conventional drivers suck.

bill


On 12/1/06, Tim Emerick <timothyemerick at yahoo.com> wrote:
I've been contemplating converting my 2 disk raid1 to a 4 disk raid5.  Couple of questions to those in the know.
 
Machine: Intel P4 1.5Ghz Stepping 02, 512meg ram, 2-WD 80GB UDMA/100 raid1 mirror using debian testing.
 
Usage: General office/campus use as a samba file server.  About 150 PC's connected to it with maybe 20-30 users max performing simultaneous read/writes.  Activity is mostly database type with small read/writes.  Others are accessing office type documents. 
 
With a 4 disk raid5 array (safety matters ya know).  Will I notice a huge difference in read/write speed from what I have now or just nominal?
 
Does SATA vs ATA make a big difference?
 
I'm pretty sure the bottleneck at this point is the sluggish disk access but how can I verify that it's the disks and not a saturated network connection?  I've been using a utility called bwm-ng to monitor bandwidth and have not seen it come close to the 100mb/s that my NIC is rated. 
 
Thanks for any insights.
 
Tim Emerick
 



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