Hi Richard, On 03/08/2016 12:06 PM, Richard Laager wrote: > Is there anything else I can do to help diagnose this? > > Am I correct in thinking this is a bug? I'm looking into this, but I'm not yet sure of what the client is doing. Your packet trace makes it look like we do recover, although I don't know why it takes more than one RST packet. Is this easy for you to reproduce? It would be great if you can send me debugging statements from the client. You can enable them with the command: `rpcdebug -m rpc -s trans call` and then rerun the failover. Client messages should show up in dmesg. Thanks, Anna > > On 02/13/2016 08:24 PM, Richard Laager wrote: >> [1.] One line summary of the problem: >> >> NFS Client Ignores TCP Resets >> >> [2.] Full description of the problem/report: >> >> Steps to reproduce: >> 1) Mount NFS share from HA cluster with TCP. >> 2) Failover the HA cluster. (The NFS server's IP address moves from one >> machine to the other.) >> 3) Access the mounted NFS share from the client (an `ls` is sufficient). >> >> Expected results: >> Accessing the NFS mount works fine immediately. >> >> Actual results: >> Accessing the NFS mount hangs for 5 minutes. Then the TCP connection >> times out, a new connection is established, and it works fine again. >> >> After the IP moves, the new server responds to the client with TCP RST >> packets, just as I would expect. I would expect the client to tear down >> its TCP connection immediately and re-establish a new one. But it >> doesn't. Am I confused, or is this a bug? >> >> For the duration of this test, all iptables firewalling was disabled on >> the client machine. >> >> I have a packet capture of a minimized test (just a simple ls): >> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1542826/+attachment/4571304/+files/dovecot-test.upstream-kernel.pcap >> >> >> Note that this is a "single failover" scenario. It is NOT a case of >> failing over and then failing back before the TCP connection times out >> on the first NFS server. >> >> [3.] Keywords (i.e., modules, networking, kernel): >> >> [4.] Kernel version (from /proc/version): >> >> Linux version 4.5.0-040500rc3-generic (kernel@gomeisa) (gcc version >> 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2) ) #201602071930 SMP Mon Feb 8 >> 00:34:43 UTC 2016 >> >> [5.] Output of Oops.. message (if applicable) with symbolic information >> resolved (see Documentation/oops-tracing.txt) >> >> N/A. No Oops. >> >> [6.] A small shell script or example program which triggers the >> problem (if possible) >> >> This is not a self-contained example, but this information may be useful: >> >> echo 10.20.0.30:/export/krls1/mail /mnt/mail nfs >> bg,noacl,noatime,noexec,nordirplus,proto=tcp,vers=3 0 0 >> /etc/fstab >> mount /mnt/mail >> ls /mnt/mail # Works >> # Failover HA cluster >> ls /mnt/mail # Hangs for 5 minutes >> >> [7.] Environment >> >> $ lsb_release -rd >> Description: Ubuntu 15.10 >> Release: 15.10 >> >> [7.1.] Software (add the output of the ver_linux script here) >> >> $ sh ver_linux >> If some fields are empty or look unusual you may have an old version. >> Compare to the current minimal requirements in Documentation/Changes. >> >> Linux dovecot-test 4.5.0-040500rc3-generic #201602071930 SMP Mon Feb 8 >> 00:34:43 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux >> >> GNU C 5.2.1 >> GNU Make 4.0 >> Binutils 2.25.1 >> Util-linux 2.26.2 >> Mount 2.26.2 >> Module-init-tools 21 >> E2fsprogs 1.42.12 >> Linux C Library 2.21 >> Dynamic linker (ldd) 2.21 >> Linux C++ Library 6.0.21 >> Procps 3.3.9 >> Net-tools 1.60 >> Kbd 1.15.5 >> Console-tools 1.15.5 >> Sh-utils 8.23 >> Udev 225 >> Wireless-tools 30 >> Modules Loaded 8250_fintek autofs4 cirrus drm drm_kms_helper >> fb_sys_fops floppy fscache grace i2c_piix4 input_leds ip6table_filter >> ip6_tables ip6t_REJECT ip6t_rt iptable_filter ip_tables ipt_REJECT >> irqbypass joydev kvm kvm_intel lockd mac_hid nf_conntrack >> nf_conntrack_broadcast nf_conntrack_ftp nf_conntrack_ipv4 >> nf_conntrack_ipv6 nf_conntrack_netbios_ns nf_defrag_ipv4 nf_defrag_ipv6 >> nf_nat nf_nat_ftp nf_reject_ipv4 nf_reject_ipv6 nfs nfs_acl nfsv3 >> parport parport_pc pata_acpi ppdev psmouse pvpanic serio_raw sunrpc >> syscopyarea sysfillrect sysimgblt ttm x_tables xt_addrtype xt_comment >> xt_conntrack xt_hl xt_limit xt_multiport xt_recent xt_tcpudp >> >> [7.2.] Processor information (from /proc/cpuinfo): >> >> $ cat /proc/cpuinfo >> processor : 0 >> vendor_id : GenuineIntel >> cpu family : 6 >> model : 23 >> model name : Intel Core 2 Duo P9xxx (Penryn Class Core 2) >> stepping : 3 >> microcode : 0x1 >> cpu MHz : 2666.764 >> cache size : 4096 KB >> physical id : 0 >> siblings : 1 >> core id : 0 >> cpu cores : 1 >> apicid : 0 >> initial apicid : 0 >> fpu : yes >> fpu_exception : yes >> cpuid level : 4 >> wp : yes >> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca >> cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc >> rep_good nopl pni vmx ssse3 cx16 sse4_1 x2apic hypervisor lahf_lm vnmi ept >> bugs : >> bogomips : 5333.52 >> clflush size : 64 >> cache_alignment : 64 >> address sizes : 40 bits physical, 48 bits virtual >> power management: >> >> processor : 1 >> vendor_id : GenuineIntel >> cpu family : 6 >> model : 23 >> model name : Intel Core 2 Duo P9xxx (Penryn Class Core 2) >> stepping : 3 >> microcode : 0x1 >> cpu MHz : 2666.764 >> cache size : 4096 KB >> physical id : 1 >> siblings : 1 >> core id : 0 >> cpu cores : 1 >> apicid : 1 >> initial apicid : 1 >> fpu : yes >> fpu_exception : yes >> cpuid level : 4 >> wp : yes >> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca >> cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx lm constant_tsc >> rep_good nopl pni vmx ssse3 cx16 sse4_1 x2apic hypervisor lahf_lm vnmi ept >> bugs : >> bogomips : 5333.52 >> clflush size : 64 >> cache_alignment : 64 >> address sizes : 40 bits physical, 48 bits virtual >> power management: >> >> [7.3.] Module information (from /proc/modules): >> >> $ cat /proc/modules >> nfsv3 40960 1 - Live 0x0000000000000000 >> nfs_acl 16384 1 nfsv3, Live 0x0000000000000000 >> nfs 253952 2 nfsv3, Live 0x0000000000000000 >> lockd 94208 2 nfsv3,nfs, Live 0x0000000000000000 >> grace 16384 1 lockd, Live 0x0000000000000000 >> fscache 61440 1 nfs, Live 0x0000000000000000 >> ppdev 20480 0 - Live 0x0000000000000000 >> kvm_intel 184320 0 - Live 0x0000000000000000 >> kvm 561152 1 kvm_intel, Live 0x0000000000000000 >> joydev 20480 0 - Live 0x0000000000000000 >> input_leds 16384 0 - Live 0x0000000000000000 >> irqbypass 16384 1 kvm, Live 0x0000000000000000 >> serio_raw 16384 0 - Live 0x0000000000000000 >> i2c_piix4 24576 0 - Live 0x0000000000000000 >> 8250_fintek 16384 0 - Live 0x0000000000000000 >> pvpanic 16384 0 - Live 0x0000000000000000 >> parport_pc 32768 0 - Live 0x0000000000000000 >> parport 49152 2 ppdev,parport_pc, Live 0x0000000000000000 >> mac_hid 16384 0 - Live 0x0000000000000000 >> ip6t_REJECT 16384 1 - Live 0x0000000000000000 >> nf_reject_ipv6 16384 1 ip6t_REJECT, Live 0x0000000000000000 >> xt_hl 16384 22 - Live 0x0000000000000000 >> ip6t_rt 16384 3 - Live 0x0000000000000000 >> nf_conntrack_ipv6 20480 9 - Live 0x0000000000000000 >> nf_defrag_ipv6 36864 1 nf_conntrack_ipv6, Live 0x0000000000000000 >> ipt_REJECT 16384 1 - Live 0x0000000000000000 >> nf_reject_ipv4 16384 1 ipt_REJECT, Live 0x0000000000000000 >> xt_comment 16384 8 - Live 0x0000000000000000 >> xt_multiport 16384 2 - Live 0x0000000000000000 >> xt_recent 20480 4 - Live 0x0000000000000000 >> xt_limit 16384 1 - Live 0x0000000000000000 >> xt_tcpudp 16384 26 - Live 0x0000000000000000 >> xt_addrtype 16384 4 - Live 0x0000000000000000 >> nf_conntrack_ipv4 16384 9 - Live 0x0000000000000000 >> nf_defrag_ipv4 16384 1 nf_conntrack_ipv4, Live 0x0000000000000000 >> xt_conntrack 16384 18 - Live 0x0000000000000000 >> ip6table_filter 16384 1 - Live 0x0000000000000000 >> ip6_tables 28672 1 ip6table_filter, Live 0x0000000000000000 >> nf_conntrack_netbios_ns 16384 0 - Live 0x0000000000000000 >> nf_conntrack_broadcast 16384 1 nf_conntrack_netbios_ns, Live >> 0x0000000000000000 >> nf_nat_ftp 16384 0 - Live 0x0000000000000000 >> nf_nat 24576 1 nf_nat_ftp, Live 0x0000000000000000 >> nf_conntrack_ftp 20480 1 nf_nat_ftp, Live 0x0000000000000000 >> nf_conntrack 106496 8 >> nf_conntrack_ipv6,nf_conntrack_ipv4,xt_conntrack,nf_conntrack_netbios_ns,nf_conntrack_broadcast,nf_nat_ftp,nf_nat,nf_conntrack_ftp, >> Live 0x0000000000000000 >> iptable_filter 16384 1 - Live 0x0000000000000000 >> ip_tables 28672 1 iptable_filter, Live 0x0000000000000000 >> x_tables 36864 15 >> ip6t_REJECT,xt_hl,ip6t_rt,ipt_REJECT,xt_comment,xt_multiport,xt_recent,xt_limit,xt_tcpudp,xt_addrtype,xt_conntrack,ip6table_filter,ip6_tables,iptable_filter,ip_tables, >> Live 0x0000000000000000 >> sunrpc 335872 17 nfsv3,nfs_acl,nfs,lockd, Live 0x0000000000000000 >> autofs4 40960 2 - Live 0x0000000000000000 >> cirrus 28672 1 - Live 0x0000000000000000 >> ttm 98304 1 cirrus, Live 0x0000000000000000 >> drm_kms_helper 147456 1 cirrus, Live 0x0000000000000000 >> syscopyarea 16384 1 drm_kms_helper, Live 0x0000000000000000 >> sysfillrect 16384 1 drm_kms_helper, Live 0x0000000000000000 >> sysimgblt 16384 1 drm_kms_helper, Live 0x0000000000000000 >> fb_sys_fops 16384 1 drm_kms_helper, Live 0x0000000000000000 >> floppy 73728 0 - Live 0x0000000000000000 >> drm 364544 4 cirrus,ttm,drm_kms_helper, Live 0x0000000000000000 >> psmouse 126976 0 - Live 0x0000000000000000 >> pata_acpi 16384 0 - Live 0x0000000000000000 >> >> [7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem) >> >> $ cat /proc/ioports >> 0000-0cf7 : PCI Bus 0000:00 >> 0000-001f : dma1 >> 0020-0021 : pic1 >> 0040-0043 : timer0 >> 0050-0053 : timer1 >> 0060-0060 : keyboard >> 0064-0064 : keyboard >> 0070-0071 : rtc0 >> 0080-008f : dma page reg >> 00a0-00a1 : pic2 >> 00c0-00df : dma2 >> 00f0-00ff : fpu >> 0170-0177 : 0000:00:01.1 >> 0170-0177 : ata_piix >> 01f0-01f7 : 0000:00:01.1 >> 01f0-01f7 : ata_piix >> 0376-0376 : 0000:00:01.1 >> 0376-0376 : ata_piix >> 03f2-03f2 : floppy >> 03f4-03f5 : floppy >> 03f6-03f6 : 0000:00:01.1 >> 03f6-03f6 : ata_piix >> 03f7-03f7 : floppy >> 03f8-03ff : serial >> 0cf8-0cff : PCI conf1 >> 0d00-adff : PCI Bus 0000:00 >> 5658-565b : vmmouse >> ae0f-aeff : PCI Bus 0000:00 >> af20-afdf : PCI Bus 0000:00 >> afe0-afe3 : ACPI GPE0_BLK >> afe4-ffff : PCI Bus 0000:00 >> b000-b03f : 0000:00:01.3 >> b000-b003 : ACPI PM1a_EVT_BLK >> b004-b005 : ACPI PM1a_CNT_BLK >> b008-b00b : ACPI PM_TMR >> b100-b10f : 0000:00:01.3 >> b100-b107 : piix4_smbus >> c000-c03f : 0000:00:04.0 >> c000-c03f : virtio-pci-legacy >> c040-c07f : 0000:00:05.0 >> c040-c07f : virtio-pci-legacy >> c080-c09f : 0000:00:01.2 >> c080-c09f : uhci_hcd >> c0a0-c0bf : 0000:00:03.0 >> c0a0-c0bf : virtio-pci-legacy >> c0c0-c0df : 0000:00:06.0 >> c0c0-c0df : virtio-pci-legacy >> c0e0-c0ff : 0000:00:08.0 >> c0e0-c0ff : virtio-pci-legacy >> c100-c10f : 0000:00:01.1 >> c100-c10f : ata_piix >> >> $ cat /proc/iomem >> 00000000-00000fff : reserved >> 00001000-0009fbff : System RAM >> 0009fc00-0009ffff : reserved >> 000a0000-000bffff : PCI Bus 0000:00 >> 000c0000-000c8dff : Video ROM >> 000c9000-000c99ff : Adapter ROM >> 000ca000-000ca9ff : Adapter ROM >> 000cb000-000cd3ff : Adapter ROM >> 000f0000-000fffff : reserved >> 000f0000-000fffff : System ROM >> 00100000-3fffdfff : System RAM >> 01000000-018284f9 : Kernel code >> 018284fa-01f4497f : Kernel data >> 020c3000-02205fff : Kernel bss >> 3fffe000-3fffffff : reserved >> 40000000-febfffff : PCI Bus 0000:00 >> fc000000-fdffffff : 0000:00:02.0 >> fc000000-fdffffff : cirrusdrmfb_vram >> feb40000-feb7ffff : 0000:00:03.0 >> feb80000-febbffff : 0000:00:08.0 >> febc0000-febcffff : 0000:00:02.0 >> febd0000-febd0fff : 0000:00:02.0 >> febd0000-febd0fff : cirrusdrmfb_mmio >> febd1000-febd1fff : 0000:00:03.0 >> febd2000-febd2fff : 0000:00:04.0 >> febd3000-febd3fff : 0000:00:05.0 >> febd4000-febd400f : 0000:00:07.0 >> febd5000-febd5fff : 0000:00:08.0 >> fec00000-fec003ff : IOAPIC 0 >> fed00000-fed003ff : HPET 0 >> fed00000-fed003ff : PNP0103:00 >> fee00000-fee00fff : Local APIC >> feffc000-feffffff : reserved >> fffc0000-ffffffff : reserved >> >> [7.5.] PCI information ('lspci -vvv' as root) >> >> $ sudo lspci -vvv >> 00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev >> 02) >> Subsystem: Red Hat, Inc Qemu virtual machine >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR- FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> >> 00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II] >> Subsystem: Red Hat, Inc Qemu virtual machine >> Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> >> 00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE >> [Natoma/Triton II] (prog-if 80 [Master]) >> Subsystem: Red Hat, Inc Qemu virtual machine >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) >> [size=8] >> Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) >> Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) >> [size=8] >> Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) >> Region 4: I/O ports at c100 [size=16] >> Kernel driver in use: ata_piix >> >> 00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB >> [Natoma/Triton II] (rev 01) (prog-if 00 [UHCI]) >> Subsystem: Red Hat, Inc QEMU Virtual Machine >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin D routed to IRQ 10 >> Region 4: I/O ports at c080 [size=32] >> Kernel driver in use: uhci_hcd >> >> 00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03) >> Subsystem: Red Hat, Inc Qemu virtual machine >> Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Interrupt: pin A routed to IRQ 9 >> Kernel driver in use: piix4_smbus >> >> 00:02.0 VGA compatible controller: Cirrus Logic GD 5446 (prog-if 00 [VGA >> controller]) >> Subsystem: Red Hat, Inc QEMU Virtual Machine >> Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Region 0: Memory at fc000000 (32-bit, prefetchable) [size=32M] >> Region 1: Memory at febd0000 (32-bit, non-prefetchable) [size=4K] >> Expansion ROM at febc0000 [disabled] [size=64K] >> Kernel driver in use: cirrus >> >> 00:03.0 Ethernet controller: Red Hat, Inc Virtio network device >> Subsystem: Red Hat, Inc Device 0001 >> Physical Slot: 3 >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx+ >> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin A routed to IRQ 0 >> Region 0: I/O ports at c0a0 [size=32] >> Region 1: Memory at febd1000 (32-bit, non-prefetchable) [size=4K] >> Expansion ROM at feb40000 [disabled] [size=256K] >> Capabilities: [40] MSI-X: Enable+ Count=3 Masked- >> Vector table: BAR=1 offset=00000000 >> PBA: BAR=1 offset=00000800 >> Kernel driver in use: virtio-pci >> >> 00:04.0 SCSI storage controller: Red Hat, Inc Virtio block device >> Subsystem: Red Hat, Inc Device 0002 >> Physical Slot: 4 >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx+ >> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin A routed to IRQ 0 >> Region 0: I/O ports at c000 [size=64] >> Region 1: Memory at febd2000 (32-bit, non-prefetchable) [size=4K] >> Capabilities: [40] MSI-X: Enable+ Count=2 Masked- >> Vector table: BAR=1 offset=00000000 >> PBA: BAR=1 offset=00000800 >> Kernel driver in use: virtio-pci >> >> 00:05.0 SCSI storage controller: Red Hat, Inc Virtio block device >> Subsystem: Red Hat, Inc Device 0002 >> Physical Slot: 5 >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx+ >> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin A routed to IRQ 0 >> Region 0: I/O ports at c040 [size=64] >> Region 1: Memory at febd3000 (32-bit, non-prefetchable) [size=4K] >> Capabilities: [40] MSI-X: Enable+ Count=2 Masked- >> Vector table: BAR=1 offset=00000000 >> PBA: BAR=1 offset=00000800 >> Kernel driver in use: virtio-pci >> >> 00:06.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon >> Subsystem: Red Hat, Inc Device 0005 >> Physical Slot: 6 >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin A routed to IRQ 11 >> Region 0: I/O ports at c0c0 [size=32] >> Kernel driver in use: virtio-pci >> >> 00:07.0 System peripheral: Intel Corporation 6300ESB Watchdog Timer >> Subsystem: Red Hat, Inc QEMU Virtual Machine >> Physical Slot: 7 >> Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx- >> Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Region 0: Memory at febd4000 (32-bit, non-prefetchable) [size=16] >> >> 00:08.0 Ethernet controller: Red Hat, Inc Virtio network device >> Subsystem: Red Hat, Inc Device 0001 >> Physical Slot: 8 >> Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- >> Stepping- SERR+ FastB2B- DisINTx+ >> Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- >> <TAbort- <MAbort- >SERR- <PERR- INTx- >> Latency: 0 >> Interrupt: pin A routed to IRQ 0 >> Region 0: I/O ports at c0e0 [size=32] >> Region 1: Memory at febd5000 (32-bit, non-prefetchable) [size=4K] >> Expansion ROM at feb80000 [disabled] [size=256K] >> Capabilities: [40] MSI-X: Enable+ Count=3 Masked- >> Vector table: BAR=1 offset=00000000 >> PBA: BAR=1 offset=00000800 >> Kernel driver in use: virtio-pci >> >> [7.6.] SCSI information (from /proc/scsi/scsi) >> >> $ cat /proc/scsi/scsi >> Attached devices: >> Host: scsi1 Channel: 00 Id: 00 Lun: 00 >> Vendor: QEMU Model: QEMU DVD-ROM Rev: 2.0. >> Type: CD-ROM ANSI SCSI revision: 05 >> >> [7.7.] Other information that might be relevant to the problem >> (please look in /proc and include all information that you >> think to be relevant): >> >> $ grep mail /proc/mounts >> 10.20.0.30:/export/krls1/mail /mnt/mail nfs >> rw,noexec,noatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,hard,noacl,nordirplus,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=10.20.0.30,mountvers=3,mountport=59274,mountproto=tcp,local_lock=none,addr=10.20.0.30 >> 0 0 >> >> [X.] Other notes, patches, fixes, workarounds: >> >> This particular system is a virtual machine, but we have seen this on >> physical hardware as well. >> >> If we use UDP instead of TCP, then the NFS client handles the failover >> in a timely manner. >> >> The NFS HA cluster is a system from Nexenta running their latest >> software, which is based on Illumos. Our Nexenta reseller's standard >> recommendation for HA clusters is to use UDP, because of this behavior. >> >> For our physical machines acting as virtual hosts, it doesn't make a lot >> of difference, but in the virtual machine, I'd especially like to use >> TCP, as it performs quite a bit better. >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
