On Wed, Feb 20, 2008 at 06:09:50PM -0800, Sparqz wrote: > > Hi All, > > I have a nasty problem with open-iscsi on SLES10 + an Infortrend iSCSI > array. > > Basically it looks like everything goes wrong as soon as the read/ > write load becomes heavy, although network dumps suggest the problem > is always there, it just goes critical when the load is too heavy. > > My setup: > > 1x HP DL585 - SLES10 x86_64 > 1x HP DL585 - RHEL4 x86_64 > 1x HP DL380 - SLES10 i586 >
SLES10 or SLES10SP1 ? Have you tried installing and using the latest open-iscsi from open-iscsi.org ? > 2x Cisco 2960G (gigabit) switches > > 2x Infortrend A16E-G2130-4 with 16x 1TB disks each > > The two Infortrend arrays have all their gigabit ethernet ports > plugged into one of the cisco switches, then we have 2 fibre > connections leading to the other cisco switch which has the three > servers plugged into it. The network is completely isolated from our > other company networks. > So you have only 2 gbit/sec of bandwidth between the Cisco switches? How many ethernet ports do your iSCSI arrays have (plugged in to the switches)? How many ethernet ports each server is using / plugged in to the switch? > At first I thought it was a network problem, so we replaced our dodgy > Netgear switches with quality Cisco networking gear, but the problem > is the same, if anything it's worse because the Cisco switches > facilitate higher bandwidth (extra ~20mb/s) and the errors seem to be > more reliably producible. > Do you see packet drops/errors in any of the ports? Check all ports in both switches. > None of the linux ethernet statistics report any errors (ifconfig) and > the cisco switches don't report any packet errors either. The > Infortrend arrays don't provide ethernet statistics. > Check linux TCP statistics for tcp retransmits? netstat -s > Wireshark (ethereal) shows many errors - clusters of Duplicate ACKs, > and a few "previous segment lost". > Are you using ethernet flow control? Check the switch settings, and server NIC settings.. and possible iSCSI array settings.. In a bigger IP-SAN setup with many servers and switches flow control might be needed to get a good performance and to prevent tcp retransmits from happening (=preventing the switch port buffers becoming full and packet drop happening). > Any help would be much appreciated !!! > Btw have you tried with ext3? XFS is known to have problems with some setups and versions.. I'm not familiar with Infotrend iSCSI arrays so can't comment much about them.. -- Pasi --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-iscsi@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/open-iscsi -~----------~----~----~----~------~----~------~--~---
