I get the same with dual XEON systems (I have 2 with Supermicro mb). Reading on the net. It seems that this is a know problem with people who are trying to build big systems. No solution that I have seen. ---------- Original Message ----------- From: Mark Watts <mrwatts@xxxxxxxxxxxx> To: Mikael Abrahamsson <swmike@xxxxxxxxx> Cc: linux-raid@xxxxxxxxxxxxxxx Sent: Sun, 1 Aug 2004 16:01:46 +0100 Subject: Re: 1x 3ware controllers vs. 2x 3ware controllers > > On Sun, 1 Aug 2004, Mark Watts wrote: > > > This doesn't help explain why some of us are experiencing crap > > > performance and un-responsive systems whereas others are having none of > > > these problems with the same 3Ware cards. > > > > On my 3ware equipped system running hw raid5 I get lousy write speeds > > (approx 5-15 megabyte/s) on writes. I get great read speeds. I don't sit > > directly on the console so I have no idea if the system is interactively > > responsive or not, but I notice no problems being logged in via ssh. > > > > On the other hand, the 3ware volume is only used for bulk data storage, > > the system, swap and other often needed data that is accessed and changed > > often, I have stored on SCSI drives that are RAID1 or not RAIDed at all. > > > > I would never store the system/swap on a 3ware hw RAID5, that would be > > disasterous for performance. Could you perhaps describe your system setup > > in more detail? > > Tyan S2845 > Dual Opteron 246 Processors > 2GB DDR333 Ram > nVidia FX5700 > 3Ware 8506-4LP 4 port SATA raid card > 4x 250GB Maxtor hdds > > RAID Configuration: > 4-disk RAID-5 with 64K block size. > > /dev/sda1 = / = 20GB > /dev/sda2 = swap = 2048MB > /dev/sda5 = /home = 100GB > > All partitions (except swap) formatted as ext3. > > Kernel - 2.6.8rc1, SMP for x86_64 > > Read performance is ok but nothing special. > Writing larger files (anything that takes more than a few seconds) will cause > the system to 'stutter' as the write occurs. > Longer writes (eg: copying ISO image about or formatting the rest of the > filesystem (600GB)) cause the system load to go high, very quickly. > System is almost unusable at this stage but load returns to normal as the > write completes. > > Slow write speeds is one thing, practically locking the system up while the > write occurs is another, unless I'm missing something obvious. > > - > 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 ------- End of Original Message ------- - 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
