just got dual small raptors in raid0... but lag?

[JediFonger]

my spec:
dual 34gb raptors
promise sx4 w/kingston pc100 128mb ram.

tyan tiger mpx
dual mp2800
1gb ecc ram
ati 8500dv
4 optical drives
600w psu

it still lags... for some REALLY weird reason. are those scores up above normal? somehow when i do a few things @once it feels laggy in certain places compared to when i had single raptor.

when i run benchmarks, just on read speed alone it can use upto 66+% cpu usage straight across. this is ludicrous... is this normal?

 

[Mad_Pyro]

Raid0 is striping, yes? This would lead to slightly increased read time since the data is scattered over two drives, but faster writes, since two heads are writing.

 

[JediFonger]

i felt that performance DECREASE when i upgraded to raid0. i thought raid0 was supposed to be mad fast! maybe it's just the promise card's problems? i've read that it is the driver issues here:

http://forums.2cpu.com/showthread.php?postid=380035#post380035

 

[Snugglebear]

It depends how sensitive you and your data are to access times. When I toyed with RAID0 4 years ago I noticed a distinct difference from a single drive, in a very negative sense. There's always a slight hesitation with striping that you don't get with single drives. Once that's over with things definitely do come faster, but eventually I just settled on all-SCSI to get the best of access times and transfer rates.

If you come away with anything, understand that RAID0 ain't all that - it buys you faster contiguous read/write speeds at the expense of access times and reliability. Provided you do a lot of multitasking or deal with fragmented or random access pattens, RAID0 is a shot in the foot.

Anyway, what you are seeing is a bad driver/firmware implementation on top of the natural problems with RAID0.

 

[SKiTLz]

How many times have we seen this? As already mentioned Raid 0 will do nothing to help your access times, which is most likely where your noticying your speed decrease...

 

[Snugglebear]

I've lost count. I think people see dual-channel DDR and think RAID0 is the same thing.

 

[JediFonger]

i primarily use this to do DV editing... and am now thinking about going back to single HD for apps and raid0 purely for DV data. i thought raid 0 was the shiznit

 

[SKiTLz]

Originally posted by JediFonger
i primarily use this to do DV editing... and am now thinking about going back to single HD for apps and raid0 purely for DV data. i thought raid 0 was the shiznit

5min reading before hand would have saved you the trouble..