I routinely build 11 disk software arrays in Dell 420 workstations with
promise controllers and maxtor drives. Using 80gig drives I get about
800gig ea. @ level 5 in a relatively compact box. They have a space in
the upper rear that can be easily modified to hold an extra 4 drive
bracket, the same as the one used in the front of the box. If you wanted
to drill some holes, each bracket could be further modified to hold an
extra disk for a total of 13. The power supply puts out more than enough
to spin up eleven 5,400 rpm IDE disks at once. The cost and reliability
is good, though at RAID 5, I/O is low and CPU load high but acceptable
for what I use them for. Heat is acceptable with the lower speed disks,
the 420 is well ventilated, but I attatch an extra fan to a convenient
spot on the back anyway for extra cooling. I have three of these in
production under substantual load and haven't had any problems with them
yet.
-Kanoa
Alvin Oga wrote:
> hi david...
>
> very good info .... thanx
>
> we can support 6 or 8 IDE disks in ONE 1U chassis ...
> at 80Gb each ide disks
>
> power up cycling of the disk drives is an issue...
> ....dont want all those disks powering up at the same time ...
>
> -- i'd like to see some experimenting/research going on with these
> 6 and 8 drive 1U chassis...
>
> have fun raiding...
> alvin
> http://www.linux-1u.net ... 500Gb 1U Raid5 ...
>
>
> On Mon, 2 Apr 2001, David Christensen wrote:
>
>> You might have a look at one man's experience with a Terabyte configuration
>> of 16 IDE drives at http://www.research.att.com/~gjm/linux/ide-raid.html.
>>
>> David Christensen
>>
>>> I'm working on an 18-disk raid system, but I've heard a couple
>>> responses implying that larger sized arrays do not work well with
>>> software raid. I still don't see why. As long as there is no bottleneck
>>> in the system it seems that things should work quite nicely.
>>>
>>> Out of curiosity, what is the largest/fastest system that has been
>>> built using software raid?
>>>
>>> Andy
>>>
>>>> Each of the 39160's has two Ultra-160 channels. Bearing in mind that the
>>>> fastest SCSI disks could sustain about 40 MB/s, you can hang four disks
>>>> off each channel without making the bandwidth a limiting factor. If you
>>>> want to put more than eight disks onto your array, then you will need two
>>>> 39160's of course - I just thought I'd mention it as very few people want
>>>>
>>>>> 8 disk arrays...
>>>>
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