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hello
i have for a very long time wanting to expariment with raid setup
so i finally got a hold of a raid card and i got two 40 gig hard drives and set them up as a mirrored raid, i then loaded windows xp
but there is no increase in speed???
i have a 2.4 GHz with HT
512 DDR 400 PC3200
Intel 865
most IDE raid cards do not support simultanious reading when in mirrored mode, meaning your are getting 100% data redundancy, and no speed increase. If your looking for the "umpf" of speed increase, you will have to install in a "stripe" set (raid 0). This provides no redundancy, but WILL be faster
Like Mat said, you are running Raid 1 (mirror) when you should be running Raid 0 (Stripe)
Beware, running Raid 0 increases the speed but if one drive goes pooey, then ALL data is lost
As Mat and RD says you didn't set it up right for speed, only for security.
To be honest, there are better ways to increase speed without jeapordizing data integrity.
You can try raid 0+1, but perhaps you can tell us what you really want.
Then we can help further.
https://forums.windrivers.com/images.../2006/04/1.gif
Yes but doesn't raid 0+1 require twice as many drives as raid 0 or 1? Thought so.
From:Quote:
Originally Posted by Gollo
http://www.robustdigitalsolutions.co.../raid-0-1.html
Quote:
RAID 0 1 (0+1) is striping (RAID 0) and mirroring (RAID 1) combined, without parity (redundancy data) having to be calculated and written. The advantage of RAID 0 1 is fast data access (like RAID 0), but with the ability to lose one drive and have a complete duplicate surviving drive or set of drives (like RAID 1)
Also Gollo:Quote:
Originally Posted by Gollo
Perhaps you could try helping instead of questioning.Quote:
You can try raid 0+1, but perhaps you can tell us what you really want.
Then we can help further.
What would YOU recommend????
Albeit much slower and taking more HDD space.....Quote:
Originally Posted by TripleRLtd
????Quote:
Originally Posted by TripleRLtd
And more drives as Gollo has stated.
So, we are left to wonder what it is that ngc has in mind.
Is it speed or security?
Or both????
why don't we stop the bikering and let the orignal author reply with more details?Quote:
Originally Posted by TripleRLtd
Amen!!!!Quote:
Originally Posted by Matridom
We have to realize that he/she is just trying to learn about RAID.
So, if you wll, let us help him, not confuse him: the reason I askied what he was trying to accomplish.https://forums.windrivers.com/images.../2007/09/1.gif
you can confuse just as easily by providing too much information as much as not providing enough.Quote:
Originally Posted by TripleRLtd
Too true.Quote:
Originally Posted by Matridom
You are of course right.
So, let us wait to see what he/she really wants to accomplish.https://forums.windrivers.com/images.../2006/04/1.gif
Wasn't trying to bicker just was pointing out an obvious oversite. The person said they only had 2 drives and one of the options mentioned requires more than 2 drives so I pointed that out.
I bought a whole case of raid but it just made my hard drives smoke. ...and stink.
thanks everybody for replying
so i choose the wrong setup, crap!
no biggie i can just load xp again
i want speed more than security (i keep good backups :) ) so raid 0 (stripe) looks like the way to go
but if one drive does fail cant i just load xp on a third drive and salvage the data?
and raid 0+1 looks interesting, will i get the speed from raid 0 but still have a mirrored setup? (i only have two 40 gig hds)
also i know with raid 1 (mirrored) i have 40 gigs of total storage, how much space will i have with raid 0 or raid 0+1?
thanks everybody
If one drive fails in a striped set, no the data can not be retrieved, no matter what magic wand you use. :thumbs:
Yes you should yield some speed, yet have redundancy with 0+1, that was the point made above that got clouded by the rhetoric.
Lastly, RAID 1=total capacity of the smallest disk---with two 40's, you get 40 gig usable; RAID 0, the total of the smallest disk X 2---so with two 40 gig drives you would get 80. RAID 0+1 is just a mirror of the original RAID 0, so only the capacity of that set. In this case, if you had 4 40 gig drives, you would yield 80 gig usable.
When I refer to the smallest drive, what I mean is: lets say you want RAID 0 using a 20 gig and a 40 gig drive. The 40 gig can only offer 20 gig to the mirror(Edit: I meant to say stripe here, not mirror), where the rest of the space will be wasted. With this setup you would wind up with 40 gig total from the set. Same drive config in RAID 1 will only offer 20 gig. Hope that makes some sense of the matter for you…
Quote:
Originally Posted by ngc4414
With your setup you may only do raid 0 or raid 1. raid 0+1 requires 2 more hard drives.
Raid 0 - about a 20% increase in hard drive speed (note this will be above the slowest hard drive in the array). You should have near 80gb of space to work with after it is set up. There is no redundancy and if the stripe set is broken or if a drive goes bad you loose all data on the drives.
Raid 1 is a mirror which copies one drive exactily to the other drive for data redundancy. There may be a slight boost in read speed depending upon what sort of raid card you have. This set up will leave you with about 40gb of space.
Raid 0+1 will need 4 hard drives. It will write data across 2 drives for extra speed and will make an exact copy to the other 2 drives.
0+1 has been very popular in the high end stuff (RA8000,RA12000). It's the best of both worlds at only twice the price ;)
ok everybody i setup my raid again
this time i setup a raid 0 (striped) with 32K stripes and loaded xp pro and it seems to run great
thanks everybody for clearing up this issue
now ill just make sure i always have good backups ;)