i created it with mdadm --create /dev/md0 --level=10 --layout=f2 --raid-devices=4 /dev/sda /dev/sdb /dev/sdc /dev/sdd i didn't used the chunck option (512kb is the default right?) i think you can omit the layout, maybe the n2 is better but i didn't tested i use the f2 in hdd configs when i want a 'big' read performace and a write isn't important, since ssd don't have head, maybe a layout=n2 (or no layout option, just use the default) is better, but you must test with your workload 2013/8/29 Albert Pauw <albert.pauw@xxxxxxxxx>: > Hi Roberto, > > could you share your setup? What chunksize did you use, e.g. How did > you create it (if you can remember)? > > Thanks, > > Albert > > On 29 August 2013 15:11, Roberto Spadim <rspadim@xxxxxxxxx> wrote: >> i use a raid10 far in revodrive cards, but i'm using kernel 3.10.7 >> with slackware and it runs fine >> >> 2013/8/29 Albert Pauw <albert.pauw@xxxxxxxxx>: >>> Hi guys, >>> >>> I am trying to get a RAID 10 configuration working at work, but seem >>> to hit a performance wall after 20 minutes into a DB creation session. >>> >>> Here's the setup: >>> >>> OS: Oracle Linux 5.9 (effectively RHEL 5.9), kernel 2.6.32-400.29.2.el5uek. >>> All utilities updates, mdadm (2.6.9 latest through updates). >>> >>> Setup: >>> >>> Two Fusion IO Duo cards, each Fusion IO device 640 GB, so four in total. >>> >>> Raid 10 set up as: >>> >>> striped between the two IO devices on the same Fusion IO card, and >>> mirrored between the separate cards. >>> >>> So, Fusion IO card 1, device fioa and fiob, Fusion IO card 2, device >>> fioc and fiod. >>> >>> The two stripes are fioa/fiob and fioc/fiod, and a mirror between these devices: >>> >>> mdadm --create --verbose /dev/md0 --level=10 --metadata=1.2 >>> --chunk=512 --raid-devices=4 /dev/fioa /dev/fioc /dev/fiob /dev/fiod >>> --assume-clean -N md0 >>> >>> When the performance turned out bad, after about 20 minutes, the >>> process was stopped. I broke the mirror, so the md0 device is only >>> striped, but the performance hit after 20 minutes happened again. >>> >>> The status of all cards are fine, no problems there. Then I created a >>> fs on only one device and have it run again. This time it worked fine. >>> The fs was in all cases ext3, no TRIM. >>> >>> Any suggestions, experience with this kind of setup? >>> >>> Thanks, >>> >>> Albert >>> -- >>> 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 >> >> >> >> -- >> Roberto Spadim -- Roberto Spadim -- 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
