If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
[Asus P4P800E-Deluxe] Can I make a RAID-0 array with unequal sized drives?
Can I make a RAID-0 array with unequal sized drives using the Promise
contoller? I can get away with this in the server/SCSI world with the caveaet that the array can only be as large as the smallest drive; since I want to stripe a 40 and a 20, I'd only really get 40 gigs of striped space, 20 gigs of the 40 being lost. I've RTFM and it doesn't say anything about size requirements. |
#2
|
|||
|
|||
On Fri, 30 Jul 2004 16:46:37 -0500, "Shawn Barnhart"
wrote: Can I make a RAID-0 array with unequal sized drives using the Promise contoller? I can get away with this in the server/SCSI world with the caveaet that the array can only be as large as the smallest drive; since I want to stripe a 40 and a 20, I'd only really get 40 gigs of striped space, 20 gigs of the 40 being lost. I've RTFM and it doesn't say anything about size requirements. I think you can, but, for example, with one 80 gig drive and one 120 gig drive, the raid controller will only see two drives equal to the size of the smaller drive, i.e., 160 gigs on your RAID 0 array. Kevin Miller "Either way, it is bad for Zathras." |
#3
|
|||
|
|||
"Kevin Miller" wrote in message ... I think you can, but, for example, with one 80 gig drive and one 120 gig drive, the raid controller will only see two drives equal to the size of the smaller drive, i.e., 160 gigs on your RAID 0 array. And it works just that way. I tested it using a 10gig and a 20 gig Maxstore and it let me make a 20 gig RAID-0 just fine (albeit losing the 10 gigs of space on the 20 gig drive). The downside? Way worse performance than my 80 gig SATA disk, and XP RAID is about 25% faster than the Promise RAID using the same disks. Promise: 14MB/sec write, 20 MB/sec read XP RAID: 17MB/sec write, 24 MB/sec read SATA single disk/no RAID: 48 MB/sec write, 48MB/sec read I'm pretty sure I'm handicapped by the 10 gig drive -- its old and only does UDMA2 according to XP device manager, and the 20 gig drive does UDMA5, per XP devman. The Promise controller listed both drives as UDMA 2, perhaps slowing the 20 gig drive to meet the 10 gig's max. I might get better numbers once I swap the 10 gig for the 40 gig drive. |
#4
|
|||
|
|||
Just curious, but where are you getting yr read/write figs from?
"Shawn Barnhart" wrote in message ... "Kevin Miller" wrote in message ... I think you can, but, for example, with one 80 gig drive and one 120 gig drive, the raid controller will only see two drives equal to the size of the smaller drive, i.e., 160 gigs on your RAID 0 array. And it works just that way. I tested it using a 10gig and a 20 gig Maxstore and it let me make a 20 gig RAID-0 just fine (albeit losing the 10 gigs of space on the 20 gig drive). The downside? Way worse performance than my 80 gig SATA disk, and XP RAID is about 25% faster than the Promise RAID using the same disks. Promise: 14MB/sec write, 20 MB/sec read XP RAID: 17MB/sec write, 24 MB/sec read SATA single disk/no RAID: 48 MB/sec write, 48MB/sec read I'm pretty sure I'm handicapped by the 10 gig drive -- its old and only does UDMA2 according to XP device manager, and the 20 gig drive does UDMA5, per XP devman. The Promise controller listed both drives as UDMA 2, perhaps slowing the 20 gig drive to meet the 10 gig's max. I might get better numbers once I swap the 10 gig for the 40 gig drive. |
#5
|
|||
|
|||
"D" wrote in message ... Just curious, but where are you getting yr read/write figs from? I used this program called "Nbench". It may well be wrong or misleading info, but a back-of-the-envelope file copy seemed to reiterate its findings, even if the specific numeric figures are incorrect. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Messed up RAID array | Cyde Weys | General | 11 | October 19th 04 03:11 PM |
OK does RAID make a difference or not for non-servers? | [email protected] | General | 5 | May 31st 04 10:58 PM |
Converting RAID 0 array to RAID 0+1 - Advice sought. | Mod | General | 0 | December 1st 03 04:40 PM |
help with motherboard choice | S.Boardman | General | 30 | October 20th 03 10:23 PM |
help. ga-7vrxp raid trouble, compatability and warning | todd elliott | General | 0 | July 17th 03 06:50 PM |