RAID5 vs RAPTOR?

n3x

n3x

n3x

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2 Nov 2005
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956
Location
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Having never setup a RAID array before how much faster would say a RAID5 setup with 3 new seagate 16mb jobbies be compared to a single raptor?
 
the main benefit from raptor is low seeking time so it feels quicker in winXP,

when make a RAID 0 or 5, it'll kill the seek time but write/read are much faster than single raptor

raptor = XP

RAID 5 = large storage (write/read very large files)

years ago i had RAID 0 (2 x 80GB SATA hard drives for XP, it felt slower than single 80GB hard drive but write/read was faster.
 
raid 5 is real slow if your using onboard sata as it will rely
on your processor

real raid 5 setups are done with extenral raid cards
is a lot faster
 
RAID5 is actually quite slow for writes due to the need to calculate parity bits for all the data, for onboard nForce/Intel RAID5 you're looking at only 15Mb/s or so and up to 50 or 60Mb/s for hardware based add in cards. Read speed is good - over 150Mb/s is quite achieveable.

RAID5 is good for storage but I wouldn't recommend it for a boot / system drive.
 
Thats quite suprising! So for a boot drive I would get better performance from a 74gb raptor? :confused:
 
n3x said:
Thats quite suprising! So for a boot drive I would get better performance from a 74gb raptor? :confused:
Click to expand...

correct, due low seek time

with boot drive, (XP) there are million of files need to access, windows/program folders etc

so the lower seek time, the faster the hard drive to access those files.

biggest problem with RAID5, the controller tell 3 hard drives to wait till all of its heads sync'd before access the files hence higher seek time
 
I have had a few raids, both IDE and sata, and to be honest I wouldnt do it again unless it was on a dedicated card,

Raid is just too unreliable, everytime i have used one, after a couple of months the raid has failed.

Everytime this has happened it has been on on-board raid controllers, on various motherboards
 
wesley said:
correct, due low seek time

with boot drive, (XP) there are million of files need to access, windows/program folders etc

so the lower seek time, the faster the hard drive to access those files.
Click to expand...

Do you have something to back this up? I've heared otherwise as in, major increase in booting time with raid.
 
I have had a RAID 5 array on my server for over a year now, and it has not caused any problems, i have even removed the disks during a house move and connected them in the wrong order and it booted without any problems

I usualy see 50MB/sec reads and are currently RARing a file into multiple RAR files with a write speed of 36MB/sec

I am using 6x Maxline II 250GB drives and a Supermicro software raid card
 
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