[mythtv-users] RAID on Fedora Core 3?
davidmaxwaterman at fastmail.co.uk
Fri Dec 24 07:57:06 UTC 2004
I am now thinking  of making do with 2x 2-channel PATA cards and
putting drives on as slave devices too.
If I make my 2 4-drive RAID 5 arrays like this
card 0 --- channel 0 --- master md0 #0
| - slave md1 #0
-- channel 1 --- master md0 #1
- slave md1 #1
card 1 --- channel 0 --- master md0 #2
| - slave md1 #2
-- channel 1 --- master md0 #3
- slave md1 #3
with one array's devices as master and the other array's device as slave.
My theory is, if I am fairly sure that I will only be accessing one array
at a time, then the devices will always have their own channel and performance
However, I am lead to believe that slave devices work more slowly than master
devices. Is this correct?
Assuming I am correct, with RAID-0 this might work OK, since all the channels
are equal performance, but I am not sure of the load for RAID-5 - is the load
equal on all the devices in a RAID-5 array?
 I don't want to afford two 4 channel card at the moment - they're much
more expensive that the simple EIDE cards :( So, I think I'll try it this
way and see how it does - for now.
Peter Loron wrote:
> I don't have anything to say (+/-) about Highpoint, but 3ware makes
> great hardware and they have excellent Linux support.
> On Dec 21, 2004, at 12:04 AM, Max Waterman wrote:
>> While I am waiting for opinions, I am coming to the conclusion that
>> Highpoint is a name to look for.
>> Is this right?
>> Max Waterman wrote:
>>> I am trying to build a MythTV/dvarchive box. I bought 4 Promise
>>> Ultra100TX2 PCI cards, but found that they wouldn't work
>>> with more than 2 in a system :(
>>> I was going to use linux s/w raid over the drives.
>>> I know you guys must use plenty of raid setups, so thought you'd be
>>> the best to advise on which types are best.
>>> I am running FC3, and have 4 WD800/8 and 4 WD2000/8 drives that I
>>> want to be two RAID5 volumes. I am running
>>> on a nForce3 250Gb, so network traffic is not a problem with the PCI
>>> bus, but gfx/video output maybe is (I haven't
>>> chosen my final gfx/video setup, but am currently using a cheap TNT2
>>> gfx card).
>>> I heard that Promise is giving 'lack-lustre' Linux support, so I'm
>>> totally open to not using Promise cards. I also heard
>>> that cards which do h/w RAID will give less load on the PCI bus.
>>> How should I do this? What h/w?
>>> mythtv-users mailing list
>>> mythtv-users at mythtv.org
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
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