On Fri, 2004-07-30 at 00:15, Mark Watts wrote: > > I'm looking at building what I guess you could call a budget NAS > > array. I'm looking to start with four 250MB SATA drives on 3ware > > 8506-4LP controller. I eventually want to move to eight drives in the > > box. Is there any reason to expect that the performance of eight > > drives spread across two 8506-4LP controllers is going to be any worse > > then the same eight drives all on one 8506-8? oh one thing I forgot -- are you going to use software RAID or hardware RAID? Because with hardware RAID, I don't think you can spread a RAID across two controllers. That might affect your decision. > With the performance issues I'm seeing with the 8506-4LP's I have, I wouldn't > recommend them to anyone currently... > > The thread on LKML from a few days ago about mke2fs -j and 8506-4LP says it > all, but basically and reasonable amount of I/O brings a Dual Opteron system > to its knees. > And by reasonable I mean copying ISO images from a usb2 drive to a raid 5 (4 x > 250GB maxtor) or even just formatting a 600MB partition. I've been able to get nearly 1.5 Gbits/sec off of an 8506-8, with 8 250GB disks... of course those are all 1 megabyte reads (but from random locations). Is your problem related to # of IO's, or size of transfer? Scott - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
