Re: RAID5 - ATA vs SATA

from the linux raid how to:
only one ide device per bus in a raid,
one malfunctioning can bring the other unusable too,
(you can use a pci ide card though)

hdparm -t device
should give you speed info,


On Dec 1, 2006, at 2:40 PM, Tim Emerick 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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