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тАО03-17-2009 02:19 AM
тАО03-17-2009 02:19 AM
Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
Does anyone have a similar setup? I use the latest firmware.
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тАО03-17-2009 04:23 PM
тАО03-17-2009 04:23 PM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
Have you done the same on the servers?
Do you know that when/if the link flow-controls your hosts have "deep enough" queues to keep from overflowing those in the hosts?
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тАО03-17-2009 11:50 PM
тАО03-17-2009 11:50 PM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
I haven't heard any complaint about the combination with jumbo+fc but I haven't been using a analyzer yet to check for resends.
The question is indeed why it is retransmitting. If the counters on the hp switch stay at 0 then could also be your hosts which are to blame. Which kind of NICs are you using? My experience (4 years iscsi) is that e1000 from intel are the best iscsi nics. Broadcom based nics are not that good if the usage is around 100%.
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тАО03-18-2009 01:20 AM
тАО03-18-2009 01:20 AM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
This is a toughie for a forum. I would recommend the following
walkmib ifname ( to get the .### to user name for ports )
and then
walkmib ifindiscards ( Interface inbound discards )
walkmib ifoutdiscards ( Interface outbound discards )
Do this once .... let it run for a bit and repeat the above commands.
show interfaces all can also be used to identify other types of drops i.e. FCS errors
Now if you notice an increment in ifoutdiscards.
Look at the Advanced Traffic Guide and QoS Queue Configuration ( In chapter 6 )
You might want to go to 4 queues, if you do not use and QoS / CoS / Routing Protocols you might be able to go to 2 queues safely but I would first check the 4 queue mode out as en experiment if possible.
be aware of the forced reboot etc etc
HTH
gpr
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тАО03-18-2009 05:46 AM
тАО03-18-2009 05:46 AM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
We have a mix of hba's from Qlogic and Alacritech and run VMware ESX and NAS servers with large datafiles, we use 3 Equallogic's in one storagepool meaning 6Gbps
bandwidth.
I must say we are stessingout our SAN measering speeds over 400MByte/s.
After some further testing I have found the resends source, the networkanalyzer was the problem. It couldn't buffer the huge amount of traffic so it not track all packets send.
Gerard what settings do you use with QoS? I tried TCP/UDP port priorty with 4 queues but could not see a better performance. The TCP ports I used were:
| Port Apply rule DSCP Prio
-------- + ---- ---------- + ------
TCP | 3260 Priority | 3
TCP | 3205 Priority | 3
UDP | 3205 Priority | 3
UDP | 3260 Priority | 3
TCP | 860 Priority | 3
UDP | 860 Priority | 3
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тАО03-18-2009 06:34 AM
тАО03-18-2009 06:34 AM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
You should not need to tune the QoS settings unless you have contention( Except if it is required by the manufacturer ).
Look at Table 6-12. "Default GMB Percentage Allocations per QoS Queue Configuration"
Since the switch is 100% dedicated to your "LAN-SAN". I would suggest the following
1. Don't mess with QoS it is dedicated to your storage Ethernet traffic :)
2. Configure it for 2 queues
HTH
Gerhard
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тАО03-18-2009 08:12 AM
тАО03-18-2009 08:12 AM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
So, what you were seeing were gaps in the TCP (?) sequence space but not actual retransmissions of given TCP sequence numbers? That can be a _very_ common problem especially if you have full duplex communications and a monitor port setup - the full duplex traffic of even one port cannot "fit" in one direction on the monitor port. Hence the reason to also always check the stats on the ends, and if possible the middle :)
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тАО03-19-2009 12:37 AM
тАО03-19-2009 12:37 AM
Re: Procurce 5406zl iSCSI Jumbo packet+Flow control packet loss
The 5400 have more portbuffer then the 2800/2900 series but not enough for heavy usage?
With the 2800 you can free more buffer using the qos-passthrough-mode, does this do the same for the 5400 when using 2 queue QoS even when you're not using QoS?
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тАО03-23-2009 12:49 AM
тАО03-23-2009 12:49 AM