Reported on gluster-users:
chadr wrote:
> I ran the same dd tests from KnowYourNFSAlpha-1.pdf and performance is
> inconsistent and causes the server to become unresponsive.
> 
> My server freezes every time when I run the following command:
> dd if=/dev/zero of=garb bs=256k count=64000
> 
> I would also like to mount a path like: /volume/some/random/dir 
> 
> # mount host:/gluster/tmp /mnt/test
> mount: host:/gluster/tmp failed, reason given by server: No such file or
> directory
> 
> I can mount it up host:/volume_name and /mnt/test/tmp exists
> 
> dd if=/dev/zero of=garb bs=64K count=100
> 100+0 records in
> 100+0 records out
> 6553600 bytes (6.6 MB) copied, 0.068906 seconds, 95.1 MB/s
> 
> dd of=garb if=/dev/zero bs=64K count=100
> 100+0 records in
> 100+0 records out
> 6553600 bytes (6.6 MB) copied, 0.057207 seconds, 115 MB/s
> 
> dd if=/dev/zero of=garb bs=64K count=1000
> 1000+0 records in
> 1000+0 records out
> 65536000 bytes (66 MB) copied, 0.523117 seconds, 125 MB/s
> 
> dd of=garb if=/dev/zero bs=64K count=1000
> 1000+0 records in
> 1000+0 records out
> 65536000 bytes (66 MB) copied, 1.04666 seconds, 62.6 MB/s
> 
> dd if=/dev/zero of=garb bs=64K count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes (655 MB) copied, 10.9809 seconds, 59.7 MB/s
> 
> dd of=garb if=/dev/zero bs=64K count=10000
> 10000+0 records in
> 10000+0 records out
> 655360000 bytes (655 MB) copied, 11.3515 seconds, 57.7 MB/s
> 
> dd if=/dev/zero of=garb bs=128K count=100
> 100+0 records in
> 100+0 records out
> 13107200 bytes (13 MB) copied, 0.105364 seconds, 124 MB/s
> 
> dd of=garb if=/dev/zero bs=128K count=100
> 100+0 records in
> 100+0 records out
> 13107200 bytes (13 MB) copied, 0.254225 seconds, 51.6 MB/s
> 
> dd if=/dev/zero of=garb bs=128K count=1000
> 1000+0 records in
> 1000+0 records out
> 131072000 bytes (131 MB) copied, 60.1008 seconds, 2.2 MB/s
> 
> dd of=garb if=/dev/zero bs=128K count=1000
> 1000+0 records in
> 1000+0 records out
> 131072000 bytes (131 MB) copied, 1.51868 seconds, 86.3 MB/s
> 
> dd if=/dev/zero of=garb bs=128K count=10000
> 10000+0 records in
> 10000+0 records out
> 1310720000 bytes (1.3 GB) copied, 18.7755 seconds, 69.8 MB/s
> 
> dd of=garb if=/dev/zero bs=128K count=10000
> 10000+0 records in
> 10000+0 records out
> 1310720000 bytes (1.3 GB) copied, 18.9837 seconds, 69.0 MB/s
> 
> dd if=/dev/zero of=garb bs=256k count=64000
> My server freezes.
> 
> 
> Here is the recent nfs log when the server froze:
> 
> [2010-04-09 23:37:33] D [nfs3-helpers.c:2114:nfs3_log_rw_call] nfs-nfsv3:
> XID: 6f68c85f, WRITE: args: FH: hashcount 2, xlid 0, gen
> 5458285267163021319, ino 11856898, offset: 1129578496,  count: 65536,
> UNSTABLE
> [2010-04-09 23:37:33] D [rpcsvc.c:1790:rpcsvc_request_create] rpc-service:
> RPC XID: 7068c85f, Ver: 2, Program: 100003, ProgVers: 3, Proc: 7
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [nfs3-helpers.c:2114:nfs3_log_rw_call] nfs-nfsv3:
> XID: 7068c85f, WRITE: args: FH: hashcount 2, xlid 0, gen
> 5458285267163021319, ino 11856898, offset: 1129644032,  count: 65536,
> UNSTABLE
> [2010-04-09 23:37:33] D [rpcsvc.c:1790:rpcsvc_request_create] rpc-service:
> RPC XID: 7168c85f, Ver: 2, Program: 100003, ProgVers: 3, Proc: 7
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [rpcsvc.c:1266:rpcsvc_program_actor] rpc-service:
> Actor found: NFS3 - WRITE
> [2010-04-09 23:37:33] D [nfs3-helpers.c:2114:nfs3_log_rw_call] nfs-nfsv3:
> XID: 7168c85f, WRITE: args: FH: hashcount 2, xlid 0, gen
> 5458285267163021319, ino 11856898, offset: 1129709568,  count: 65536,
> UNSTABLE
> [2010-04-09 23:38:33] D [rpcsvc.c:1790:rpcsvc_request_create] rpc-service:
> RPC XID: 6268c85f, Ver: 2, Program: 100003, ProgVers: 3, Proc: 7
> 
> Thanks,
> Chad Richards
> _________________________