[HPDD-discuss] Lustre 2.4 IO testing with Lustre IO Toolkit

Hello, We have a 5 node Lustre 2.4 setup now with 1 MGS/MDS, 2 OSS and 2 Clients, each OSS has 1 OST, OST device has been provisioned from a storage array. Setup seems to be fine as I am able to mount all OSTs on client and write files on the OSTs. I am able to run the basic commands successfully e.g. "lfs df -h", "lfs df -ih", "ls -lsah" etc. But, we face some issues when we run Lustre I/O Tool kit commands specially obdfilter-survey and ost-survey. We get following error: obdfilter-survey - (noobjlo=2 noobjhi=16 thrlo=2 thrhi=64 size=24576 targets=lustre-OST0001 case=disk /usr/bin/obdfilter-survey) ost 1 sz 25165824K rsz 1024K obj 1 thr 4 write 22126.57 ERROR rewrite 1264310.26 ERROR read 5448.33 [5982.41,6001.74] /var/log/message error is : LustreError: 11277:0:(ofd_grant.c:255:ofd_grant_space_left()) lustre-OST0000: cli ECHO_UUID/ffff88013a50b400 left 0 < tot_grant 4750324 unstable 2097152 pending 2097152 Is this something related to the size of the data we are writing or rewriting? Because, if I use small size then I do not see the error. ost-survey - ost-survey -s 300 /mnt/ost0/ /usr/bin/ost-survey: 09/17/13 OST speed survey on /mnt/ost0/ from 10.x.x.x@tcp<mailto:10.x.x.x@tcp> Cannot open : No such file or directory Has anyone faced these kind of errors? If so, what configuration change I need to do? Any suggestions on tests? Thanks, -Upanshu Upanshu Singhal EMC Data Storage Systems, Bangalore, India. Phone: 91-80-67375604