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SuperComputing 2012

Memory to Memory

No problems with memoty to memory: 37.806 Gb/s

%STARTCONSOLE% [root@sc02 ~]# fdtClient -P 7 -c 192.168.100.4 /dev/zero -d /dev/null Oct 28, 2012 11:49:59 PM lia.util.net.common.Config INFO: Using lia.util.net.copy.PosixFSFileChannelProviderFactory as FileChannelProviderFactory Oct 28, 2012 11:49:59 PM lia.util.net.common.Config INFO: FDT started in client mode FDT uses blocking I/O mode. INFO: Requested window size -1. Using window size: 49360 28/10 23:50:09 Net Out: 38.130 Gb/s Avg: 38.130 Gb/s 28/10 23:50:14 Net Out: 38.128 Gb/s Avg: 38.129 Gb/s 28/10 23:50:19 Net Out: 36.775 Gb/s Avg: 37.678 Gb/s 28/10 23:50:24 Net Out: 38.197 Gb/s Avg: 37.806 Gb/s %ENDCONSOLE%

Disk to Disk within a machine

%STARTCONSOLE% MegaCli -CfgLdAdd -r0 [252:1] WT NORA DIRECT -strpsz 1024 -a0 [root@sc02 ~]# fdtCopy if=/ssd1/010Gfile_n0010.dat of=/ssd7/010Gfile_n0010.dat [Sun Oct 28 20:56:57 PDT 2012] Current Speed = 441.648 MB/s Avg Speed: 436.479 MB/s Total Transfer: 4.277 GB %ENDCONSOLE%

Network transfer with 7 virtual disks and 1 fdtServers, 7 parallel streams

Grand total with 7 disks, 1 FDT Server: 10.533 Gb/s

%STARTCONSOLE% [root@sc02 ssd6]# fdtClient -P 7 -c 192.168.100.4 -fl /ssd6/filelist.txt -d / Avg: 10.533 Gb/s 100.00% ( 00s ) FDTReaderSession ( 13f62162-4fb5-41c5-b4fb-db9af9c453f3 ) final stats: Started: Sun Oct 28 23:33:07 PDT 2012 Ended: Sun Oct 28 23:42:42 PDT 2012 Transfer period: 09m 34s TotalBytes: 751619276800 TotalNetworkBytes: 751619276800 Exit Status: OK %ENDCONSOLE%

Network transfer with 7 virtual disks and 7 fdtServers

The test was set up with 1 virtual disk per physical disk and 1 FDT server for every disk.

Grand total with 7 disks, 7 FDT Servers: 22.196 Gb/s

%STARTCONSOLE% fdtClient -c 192.168.100.4 -p 54321 -d /ssd1/ /ssd1/100Gfile_x.dat > /root/fdt1.log & fdtClient -c 192.168.100.4 -p 54322 -d /ssd2/ /ssd2/100Gfile_x.dat > /root/fdt2.log & fdtClient -c 192.168.100.4 -p 54323 -d /ssd3/ /ssd3/100Gfile_x.dat > /root/fdt3.log & fdtClient -c 192.168.100.4 -p 54324 -d /ssd4/ /ssd4/100Gfile_x.dat > /root/fdt4.log & fdtClient -c 192.168.100.4 -p 54325 -d /ssd5/ /ssd5/100Gfile_x.dat > /root/fdt5.log & fdtClient -c 192.168.100.4 -p 54326 -d /ssd6/ /ssd6/100Gfile_x.dat > /root/fdt6.log & fdtClient -c 192.168.100.4 -p 54327 -d /ssd7/ /ssd7/100Gfile_x.dat > /root/fdt7.log & %ENDCONSOLE%

%STARTCONSOLE% Avg: 3.067 Gb/s 100.00% ( 00s ) FDTWriterSession ( 9920c20c-6378-4ef1-b14b-8393b5c1eafb ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:48 PDT 2012 Transfer period: 04m 43s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Avg: 2.962 Gb/s 100.00% ( 00s ) FDTWriterSession ( 2cc841b1-0ce5-4f09-b773-794e59d0d35e ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:58 PDT 2012 Transfer period: 04m 53s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Avg: 3.159 Gb/s 100.00% ( 00s ) FDTWriterSession ( 183111ea-8c54-4247-870f-e1f7eb8440b7 ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:42 PDT 2012 Transfer period: 04m 37s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Avg: 3.232 Gb/s 100.00% ( 00s ) FDTWriterSession ( 9bf985f6-9260-466d-b775-99f4df5931a6 ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:33 PDT 2012 Transfer period: 04m 28s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Avg: 3.297 Gb/s 100.00% ( 00s ) FDTWriterSession ( 45f42c87-44c8-4db8-8d29-fcc2b33a12a1 ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:31 PDT 2012 Transfer period: 04m 26s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Avg: 3.238 Gb/s 100.00% ( 00s ) FDTWriterSession ( 5dedbe6a-949b-47ec-9d8a-2e9c0b32e5f3 ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:36 PDT 2012 Transfer period: 04m 31s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Avg: 3.241 Gb/s 100.00% ( 00s ) FDTWriterSession ( 90247407-4dfd-417b-8022-bc3925e0f078 ) final stats: Started: Sun Oct 28 22:57:04 PDT 2012 Ended: Sun Oct 28 23:01:35 PDT 2012 Transfer period: 04m 30s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK %ENDCONSOLE%

7 clients one server

%STARTCONSOLE% 9cee52db-3569-4b29-b894-06a536c14409Net In: 1.246 Gb/s Avg: 1.216 Gb/s 99.14% ( 06s ) 9ea1e5bc-9c3c-41c0-8772-0e9a8845cbd5Net In: 1.238 Gb/s Avg: 1.219 Gb/s 99.38% ( 04s ) 9f1983ee-585f-47be-9b76-5d6d6d51f688Net In: 1.226 Gb/s Avg: 1.217 Gb/s 99.21% ( 05s ) b55d01b7-5d32-4b9c-a222-93d114a33bf7Net In: 1.201 Gb/s Avg: 1.215 Gb/s 98.95% ( 07s ) 13792c14-34e5-413e-9b2c-de1fded01a80Net In: 1.246 Gb/s Avg: 1.225 Gb/s 99.85% ( 01s ) 2456eb3d-1f19-45d8-9441-6213d1f60b39Net In: 1.209 Gb/s Avg: 1.221 Gb/s 99.54% ( 03s ) 5106e622-0934-4903-afc7-92b540759c85Net In: 1.201 Gb/s Avg: 1.220 Gb/s 99.46% ( 03s ) Total Net In: 8.569 Gb/s

......

FDTWriterSession ( 13792c14-34e5-413e-9b2c-de1fded01a80 ) final stats: Started: Mon Oct 29 10:36:24 PDT 2012 Ended: Mon Oct 29 10:48:11 PDT 2012 Transfer period: 11m 46s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:11 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:12 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed. Oct 29, 2012 10:48:12 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( 13792c14-34e5-413e-9b2c-de1fded01a80 ) /192.168.100.2:35549 FINISHED Oct 29, 2012 10:48:13 AM lia.util.net.copy.FDTWriterSession handleEndFDTSession INFO: [ FDTWriterSession ] Remote FDTReaderSession for session [ b55d01b7-5d32-4b9c-a222-93d114a33bf7 ] finished ok. Waiting for our side to finish. Oct 29, 2012 10:48:14 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( 2456eb3d-1f19-45d8-9441-6213d1f60b39 ) /192.168.100.2:35552 FINISHED

FDTWriterSession ( 2456eb3d-1f19-45d8-9441-6213d1f60b39 ) final stats: Started: Mon Oct 29 10:36:24 PDT 2012 Ended: Mon Oct 29 10:48:14 PDT 2012 Transfer period: 11m 49s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:14 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:14 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed.

FDTWriterSession ( 5106e622-0934-4903-afc7-92b540759c85 ) final stats: Started: Mon Oct 29 10:36:24 PDT 2012 Ended: Mon Oct 29 10:48:15 PDT 2012 Transfer period: 11m 50s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:15 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:15 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed. Oct 29, 2012 10:48:15 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( 5106e622-0934-4903-afc7-92b540759c85 ) /192.168.100.2:35553 FINISHED 29/10 10:48:15 7 active sessions: 9cee52db-3569-4b29-b894-06a536c14409Net In: 326.459 Mb/s Avg: 1.209 Gb/s 100.00% ( 00s ) 9ea1e5bc-9c3c-41c0-8772-0e9a8845cbd5Net In: 0.000 b/s Avg: 1.209 Gb/s 100.00% ( 00s ) 9f1983ee-585f-47be-9b76-5d6d6d51f688Net In: 254.261 Mb/s Avg: 1.209 Gb/s 100.00% ( 00s ) b55d01b7-5d32-4b9c-a222-93d114a33bf7Net In: 681.169 Mb/s Avg: 1.210 Gb/s 100.00% ( 00s ) Total Net In: 1.262 Gb/s

FDTWriterSession ( 9ea1e5bc-9c3c-41c0-8772-0e9a8845cbd5 ) final stats: Started: Mon Oct 29 10:36:25 PDT 2012 Ended: Mon Oct 29 10:48:16 PDT 2012 Transfer period: 11m 51s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:16 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:16 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed. Oct 29, 2012 10:48:16 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( 9ea1e5bc-9c3c-41c0-8772-0e9a8845cbd5 ) /192.168.100.2:35554 FINISHED Oct 29, 2012 10:48:18 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( 9f1983ee-585f-47be-9b76-5d6d6d51f688 ) /192.168.100.2:35551 FINISHED Oct 29, 2012 10:48:18 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( 9cee52db-3569-4b29-b894-06a536c14409 ) /192.168.100.2:35550 FINISHED

FDTWriterSession ( 9f1983ee-585f-47be-9b76-5d6d6d51f688 ) final stats: Started: Mon Oct 29 10:36:24 PDT 2012 Ended: Mon Oct 29 10:48:18 PDT 2012 Transfer period: 11m 53s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:18 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:18 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed.

FDTWriterSession ( 9cee52db-3569-4b29-b894-06a536c14409 ) final stats: Started: Mon Oct 29 10:36:24 PDT 2012 Ended: Mon Oct 29 10:48:18 PDT 2012 Transfer period: 11m 53s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:18 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:18 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed.

FDTWriterSession ( b55d01b7-5d32-4b9c-a222-93d114a33bf7 ) final stats: Started: Mon Oct 29 10:36:25 PDT 2012 Ended: Mon Oct 29 10:48:19 PDT 2012 Transfer period: 11m 54s TotalBytes: 107374182400 TotalNetworkBytes: 107374182400 Exit Status: OK

Oct 29, 2012 10:48:19 AM lia.util.net.copy.transport.ControlChannel run INFO: ControlThread for ( b55d01b7-5d32-4b9c-a222-93d114a33bf7 ) /192.168.100.2:35548 FINISHED Oct 29, 2012 10:48:19 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] Post Processing started Oct 29, 2012 10:48:19 AM lia.util.net.copy.FDTWriterSession doPostProcessing INFO: [ FDTWriterSession ] No post processing filters defined/processed. %ENDCONSOLE%

Post firmware single clients (November 1)

Summary: After a firmware upgrade the card no longer has connections getting stuck half open ( SYN_SENT ). Writing to disk using the -wCount feature works however we run into problems with more then 2 writer threads. Prior to the firmware update, when we hit these problems the machine would require a complete reboot in order to get back connectivity on the interface. However now we see what looks like fewer threads finish the job. Is this a FDT application problem or are we still seeing issues with the card?

transfer-notes-2012-11-01.png

Details:

With a 15 writer server halfway though the transfer the speed was cut in half. %STARTCONSOLE% 01/11 20:16:34 Net In: 11.824 Gb/s Avg: 16.476 Gb/s 99.90% ( 00s ) %ENDCONSOLE%

After the transfer of the files was complete FDT continued to report line like such:

%STARTCONSOLE% 01/11 20:16:30 Net Out: 11.686 Gb/s Avg: 16.490 Gb/s 99.54% ( 03s ) 01/11 20:16:35 Net Out: 11.770 Gb/s Avg: 16.459 Gb/s 100.00% ( 00s ) 01/11 20:16:40 Net Out: 0.000 b/s Avg: 16.354 Gb/s 100.00% ( 00s ) 01/11 20:16:45 Net Out: 0.000 b/s Avg: 16.250 Gb/s 100.00% ( 00s ) 01/11 20:16:50 Net Out: 0.000 b/s Avg: 16.147 Gb/s 100.00% ( 00s ) 01/11 20:16:55 Net Out: 0.000 b/s Avg: 16.045 Gb/s 100.00% ( 00s ) 01/11 20:17:00 Net Out: 0.000 b/s Avg: 15.945 Gb/s 100.00% ( 00s ) %ENDCONSOLE%

until eventually killed.

The problem with half open connection was eliminated with the firmware upgrade:

%STARTCONSOLE% tcp 0 1 ::ffff:10.20.3.104:54008 ::ffff:10.20.3.101:54321 SYN_SENT 5684/java %ENDCONSOLE% was fixed by moving to the 2.11.500 firmware version for the Mellanox CX3.

Using a single writer thread the transfer was completely stable.

%STARTCONSOLE% 01/11 22:33:59 Net In: 2.475 Gb/s Avg: 10.954 Gb/s 100.00% ( 00s )

FDTWriterSession ( ff0ff011-80f1-4497-8397-72e1a18ab78b ) final stats: Started: Thu Nov 01 22:14:23 PDT 2012 Ended: Thu Nov 01 22:34:04 PDT 2012 Transfer period: 19m 40s TotalBytes: 1609085802000 TotalNetworkBytes: 1609085802000 Exit Status: OK %ENDCONSOLE%

Using 2 writer threads also completely stable:

%STARTCONSOLE% 01/11 23:04:14 Net In: 3.423 Gb/s Avg: 21.328 Gb/s 100.00% ( 00s )

FDTWriterSession ( d9cad4f0-8987-4079-8ec0-7e8f73890afb ) final stats: Started: Thu Nov 01 22:54:09 PDT 2012 Ended: Thu Nov 01 23:04:18 PDT 2012 Transfer period: 10m 09s TotalBytes: 1609085802000 TotalNetworkBytes: 1609085802000 Exit Status: OK %ENDCONSOLE%

Using 3 writers there was a problem. Part way through the transfer the first 4 connection stop doing anything.

%STARTCONSOLE% 01/11 23:31:07 Net In: 6.523 Gb/s Avg: 19.177 Gb/s 100.00% ( 00s )

netstat tcp 0 0 ::ffff:10.20.3.101:54321 ::ffff:10.20.3.104:58233 ESTABLISHED 5898/java tcp 0 0 ::ffff:10.20.3.101:54321 ::ffff:10.20.3.104:58236 ESTABLISHED 5898/java tcp 0 0 ::ffff:10.20.3.101:54321 ::ffff:10.20.3.104:58234 ESTABLISHED 5898/java tcp 0 0 ::ffff:10.20.3.101:54321 ::ffff:10.20.3.104:58237 ESTABLISHED 5898/java tcp 14390168 0 ::ffff:10.20.3.101:54321 ::ffff:10.20.3.104:58235 ESTABLISHED 5898/java %ENDCONSOLE%

Kernel 3.2 testing ,and independent raid testing (Nov 3-4).

Testing the first 7 drives we still finish with things in the send-q (4 streams). %STARTCONSOLE% tcp 0 0 ::ffff:10.20.3.104:35078 ::ffff:10.20.3.101:54321 ESTABLISHED 3663/java tcp 0 11200000 ::ffff:10.20.3.104:35081 ::ffff:10.20.3.101:54321 ESTABLISHED 3663/java tcp 0 13251840 ::ffff:10.20.3.104:35080 ::ffff:10.20.3.101:54321 ESTABLISHED 3663/java %ENDCONSOLE%

2 streams looks to work reliably.

Testing with 3.2.32 kernel from shawn we see some interesting behavior with mem to mem right after the start then it stabalizes at ~38:

%STARTCONSOLE% 04/11 20:04:53 Net In: 39.153 Gb/s Avg: 39.153 Gb/s 04/11 20:04:58 Net In: 38.660 Gb/s Avg: 38.906 Gb/s 04/11 20:05:03 Net In: 38.836 Gb/s Avg: 38.883 Gb/s 04/11 20:05:08 Net In: 34.049 Gb/s Avg: 37.673 Gb/s 04/11 20:05:13 Net In: 39.013 Gb/s Avg: 37.939 Gb/s 04/11 20:05:18 Net In: 25.254 Gb/s Avg: 35.824 Gb/s 04/11 20:05:23 Net In: 13.737 Gb/s Avg: 32.669 Gb/s 04/11 20:05:28 Net In: 30.079 Gb/s Avg: 32.345 Gb/s 04/11 20:05:33 Net In: 34.175 Gb/s Avg: 32.547 Gb/s 04/11 20:05:38 Net In: 38.890 Gb/s Avg: 33.181 Gb/s 04/11 20:05:43 Net In: 23.152 Gb/s Avg: 32.269 Gb/s 04/11 20:05:48 Net In: 35.668 Gb/s Avg: 32.552 Gb/s %ENDCONSOLE%

Disk to disk with 7 disks we see pretty wild fluctuations in the throughput, but no sockets get stuck (with 4 streams):

%STARTCONSOLE% 04/11 20:21:44 Net In: 0.000 b/s Avg: 12.011 Gb/s 100.00% ( 00s )

FDTWriterSession ( bdb2c737-6d7d-41cf-bd3d-3b1ceed254ea ) final stats: Started: Sun Nov 04 20:13:23 PST 2012 Ended: Sun Nov 04 20:21:46 PST 2012 Transfer period: 08m 22s TotalBytes: 750906707600 TotalNetworkBytes: 750906707600 Exit Status: OK %ENDCONSOLE%

Repeat the above with 10 streams much better (using 7 disks same raid controller, still some fluctuations):

Complete log at: https://gist.github.com/0bc3087b37ea26cff999 %STARTCONSOLE% 04/11 21:11:12 Net Out: 3.376 Gb/s Avg: 19.598 Gb/s 100.00% ( 00s )

FDTReaderSession ( 26051cb0-ebe3-4000-86ef-2bb23c9e62f2 ) final stats: Started: Sun Nov 04 21:05:22 PST 2012 Ended: Sun Nov 04 21:11:17 PST 2012 Transfer period: 05m 54s TotalBytes: 858179094400 TotalNetworkBytes: 858179094400 Exit Status: OK %ENDCONSOLE%

Very nice Stable reads with the 3.2.32 kernel: %STARTCONSOLE% 04/11 22:05:03 Net Out: 1.515 Gb/s Avg: 35.881 Gb/s 100.00% ( 00s )

FDTReaderSession ( f5ca4066-2fa0-4a8a-9ab7-374c1aaaeed3 ) final stats: Started: Sun Nov 04 22:00:37 PST 2012 Ended: Sun Nov 04 22:05:03 PST 2012 Transfer period: 04m 25s TotalBytes: 1179996254800 TotalNetworkBytes: 1179996254800 Exit Status: OK %ENDCONSOLE%

After tcp_syncookies fix, back to kernel 2.6.32 (November 5)

Summary: We are now achieving very stable reads at 38 Gbit/s. Ramiro found that "net.ipv4.tcp_syncookies=0" must be set it order to avoid stuck sockets. After trying a large number of configuration variation we haven't achieved a write speed above 24 Gbit/s. Hyper Threading was disabled on the both send and recieve hosts.

The sockets getting stuck problem was solved completely with:

%STARTCONSOLE% net.ipv4.tcp_sack=1 net.ipv4.tcp_syncookies=0 net.ipv4.tcp_no_metrics_save=1 %ENDCONSOLE%

'net.ipv4.tcp_syncookies=0' MUST be set or you will get stuck sockets.

configured with 7 x (2 disk virtual disk reader side)

%STARTCONSOLE% [root@sc04 ~]# fdtClient -P 20 -c 10.20.3.101 -fl slotmount -d / 05/11 15:33:59 Net In: 0.000 b/s Avg: 24.743 Gb/s 100.00% ( 00s )

FDTWriterSession ( 2773bed5-4842-479c-8cd5-845d562b9429 ) final stats: Started: Mon Nov 05 15:25:54 PST 2012 Ended: Mon Nov 05 15:34:02 PST 2012 Transfer period: 08m 07s TotalBytes: 1501813415200 TotalNetworkBytes: 1501813415200 Exit Status: OK %ENDCONSOLE%

%STARTCONSOLE% [root@sc04 ~]# fdtClient -P 40 -c 10.20.3.101 -fl slotmount -d / 5/11 15:47:10 Net Out: 0.000 b/s Avg: 24.617 Gb/s 100.00% ( 00s )

FDTReaderSession ( 499258af-7340-47d4-b318-8e1f128a4747 ) final stats: Started: Mon Nov 05 15:39:00 PST 2012 Ended: Mon Nov 05 15:47:11 PST 2012 Transfer period: 08m 10s TotalBytes: 1501813415200 TotalNetworkBytes: 1501813415200 Exit Status: OK %ENDCONSOLE%

Now back to 15 disk to try out the high number of streams

%STARTCONSOLE% 05/11 17:28:55 Net In: 4.288 Gb/s Avg: 20.925 Gb/s 100.00% ( 00s )

FDTWriterSession ( c0ba0ef1-9c62-4133-8a94-e264edec70e3 ) final stats: Started: Mon Nov 05 17:22:04 PST 2012 Ended: Mon Nov 05 17:29:00 PST 2012 Transfer period: 06m 56s TotalBytes: 1072723868000 TotalNetworkBytes: 1072723868000 Exit Status: OK %ENDCONSOLE%

Now trying software raid. Looks to be limited to about 10 Gbit/s with one java thread pegged at 100%: %STARTCONSOLE% mdadm --create --verbose /dev/md0 --level=0 --raid-devices=15 /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj /dev/sdk /dev/sdl /dev/sdm /dev/sdn /dev/sdo /dev/sdp mkfs.xfs -f -d sunit=1024,swidth=1024 /dev/md0 05/11 18:04:36 Net In: 8.790 Gb/s Avg: 9.880 Gb/s 14.80% %ENDCONSOLE%

Double check we are still doing good reads. Very stable at 38 Gbit/s:

%STARTCONSOLE% 05/11 18:24:54 Net Out: 38.457 Gb/s Avg: 38.400 Gb/s 38.38% ( 03m 26s ) %ENDCONSOLE%

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Topic revision: r12 - 2012-11-06 - igable
 
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