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Forum Discussion
MPIO - slow speed
Hello! I have two ReadyNAS6 Pro boxes with the following configs: 1 box RDN6 pro/E7300/4gb/6*2Tb WD CB/4.2.27 FW 2 box RDN6 pro/E5300/2gb/6*2Tb WD CB/6.3.5 FW Other equipment: Juniper EX330...
Hi BrianL.
Two NICs obviously.
There are some good tips re MPIO here in the "Configure multiple MPIO sessions to the Target" section
With MPIO the key is have the 2 nics on separate subnets. Otherwise you cannot be sure that layer 2 gets it right
Hello, mdgm.
Thanks for "the secret key" with two subnets - I've achived ~2*890mbps at READ with RND MPIO. Not so good as other vendors, but acceptable.
I think it will be better to add more MPIO specific information to ReadyNAS OS6 manual (and about supported LB policies too).
PS C:\> C:\SQLIO\sqlio.exe -s900 -kR -frandom -b8 -t8 -o16 -LS -BN D:\testfile.dat sqlio v1.5.SG using system counter for latency timings, 2474044 counts per second 8 threads reading for 900 secs from file D:\testfile.dat using 8KB random IOs enabling multiple I/Os per thread with 16 outstanding buffering set to not use file nor disk caches (as is SQL Server) using current size: 1048576 MB for file: D:\testfile.dat initialization done CUMULATIVE DATA: throughput metrics: IOs/sec: 25979.92 MBs/sec: 202.96 latency metrics: Min_Latency(ms): 0 Avg_Latency(ms): 4 Max_Latency(ms): 75 histogram: ms: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24+ %: 10 9 11 12 11 13 11 9 9 2 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0but what's the mess with WRITE??!!
PS C:\> C:\SQLIO\sqlio.exe -s900 -kW -frandom -b8 -t8 -o16 -LS -BN D:\testfile.dat sqlio v1.5.SG using system counter for latency timings, 2474044 counts per second 8 threads writing for 900 secs to file D:\testfile.dat using 8KB random IOs enabling multiple I/Os per thread with 16 outstanding buffering set to not use file nor disk caches (as is SQL Server) using current size: 1048576 MB for file: D:\testfile.dat initialization done CUMULATIVE DATA: throughput metrics: IOs/sec: 21.26 MBs/sec: 0.16 latency metrics: Min_Latency(ms): 268 Avg_Latency(ms): 6005 Max_Latency(ms): 13647 histogram: ms: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24+ %: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 PS C:\>that is unacceptable!
All MPIO performance is relate dto the client side not the readnas. to see good speed the client must plance the iscsi commands correctly.
The readynas just reponds to the reponse on whichver interface it sees. That is why 2 subnets important because otherwise the readynas will stick to one of the interfaces to send all traffic and so you get no ballancing
But now that you have subnets considered to ReadyNAs there is no extra configuration needed for MPIO. all decison over which interface to send the iscsi commands are on the client side.
I hope this makes sense
I do agreee we could do with some doicumentation in this area but it is not a common configurtation request we have sene but seems it is becoming more popopular.
On the read speed I would think at this point it is limited by interface speed and disk / volume maximum performane not really a readynas specific thing but I could be wrong. So Raid setup and disk performnce should be the limiting factors.
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