I still have not figured out if "block" is per disk or per stripe? My current array is rebuilding and states "64k chunk" is this a per disk number or is that a functional stripe? Nice scrip Gordon. It turns out that I have build a script that does the exact same thing. I call I thrash_test. Trying to take down the array before it goes in to production. It is a very good test! I ran hdpram -t last time the array was up. It states I am running at about 200 MB/sec. I will get you the real number when the array is done rebuilding. currently at 120min left... Can any one give me more info on this error? Pulled from /var/log/messages. "raid6: read error corrected!!" -Adam Gordon Henderson wrote: > On Tue, 13 Jun 2006, Justin Piszcz wrote: > > >> mkfs -t xfs -f -d su=128k,sw=14 /dev/md9 >> >> Gordon, What speed do you get on your RAID, read and write? >> >> When I made my XFS/RAID-5, I accepted the defaults for the XFS filesystem >> but used a 512kb stripe. I get 80-90MB/s reads and ~39MB/s writes. >> >> On 5 x 400GB ATA/100 Seagates (on a regular PCI bus, max, 133mb/s) >> > > Standard Bonnie (which I find to be a crude, but reasonable test of overal > throughput of a device - server has 1G of RAM) > > zem:/mounts/pdrive# bonnie -n0 -f -g0 -u0 > Using uid:0, gid:0. > Writing intelligently...done > Rewriting...done > Reading intelligently...done > start 'em...done...done...done... > Version 1.03 ------Sequential Output------ --Sequential Input- --Random- > -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- > Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP > zem 2G 195984 59 68699 31 217398 52 1028 3 > zem,2G,,,195984,59,68699,31,,,217398,52,1028.3,3,,,,,,,,,,,,, > > > Other tests: > > zem:/mounts/pdrive# hdparm -T /dev/md9 > /dev/md9: > Timing cached reads: 3592 MB in 2.00 seconds = 1797.08 MB/sec > > zem:/mounts/pdrive# hdparm -t /dev/sda /dev/md9 > /dev/sda: > Timing buffered disk reads: 228 MB in 3.01 seconds = 75.87 MB/sec > /dev/md9: > Timing buffered disk reads: 242 MB in 3.02 seconds = 80.14 MB/sec > > The server is some Dell 1U box with a single P4/HT processor and 1G of > RAM. It has twin internal SCSI drives on a Fusion MPT driver, drives are > using Linux s/w RAID-1, of course, and it has 2 external SCSI connectors > (dual Adaptec controller) going to some big Dell 14-drive chasis with 7 > drives on each chain. I've not actually seen this box - I did the entire > build remote with the aid of someone in-front of the box who loaded Debian > on it under my instructions, until I could SSH into it and complete the > process, and did the neccessary BIOS fiddling to make sure it would boot > off the internal drives - it's in Califronia, US I'm in Devon, UK... > > Gordon > - > 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 > > - 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
