apport information ** Tags added: xenial
** Description changed: When using Scale-Out File Server (SOFS) shares, the same share is exposed by multiple share servers through a single Distributed Network Name. When a host goes down, the share connections should be automatically reestablished using a different share server. The Linux CIFS client doesn't seem to support this, although persistent handles are supported. If a host goes down, the share becomes unavailable, while the client seems to enter an endless loop, attempting to use the same share server address. Subsequent mount attempts will fail as well. SMB Witness support would also be desired, as this would reduce failover time (currently marked as TODO[1]). I've tested Ubuntu 16.04 (4.4.0) and Ubuntu 18.04 (4.15.0) as well as the latest upstream kernel (4.19). When using 4.15.0, the SOFS share cannot be mounted at all, as described in a different bug report[2]. [1] https://github.com/torvalds/linux/blob/3de5e974ba65fd1629fb6ea0cb5222c78b1580ec/Documentation/filesystems/cifs/TODO#L58-L62 [2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1792580 --- ProblemType: Bug ApportVersion: 2.20.9-0ubuntu7.3 Architecture: amd64 DistroRelease: Ubuntu 18.04 Package: linux (not installed) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) LANG=C.UTF-8 SHELL=/bin/bash Tags: bionic uec-images Uname: Linux 4.19.0-041900rc4-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True + --- + AlsaDevices: + total 0 + crw-rw---- 1 root audio 116, 1 Sep 18 08:17 seq + crw-rw---- 1 root audio 116, 33 Sep 18 08:17 timer + AplayDevices: Error: [Errno 2] No such file or directory + ApportVersion: 2.20.1-0ubuntu2.18 + Architecture: amd64 + ArecordDevices: Error: [Errno 2] No such file or directory + AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: + CRDA: N/A + DistroRelease: Ubuntu 16.04 + IwConfig: Error: [Errno 2] No such file or directory + Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub + MachineType: QEMU Standard PC (i440FX + PIIX, 1996) + Package: linux (not installed) + PciMultimedia: + + ProcEnviron: + TERM=xterm-256color + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: + + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-135-generic root=UUID=4e0b126d-f842-4ae8-bd4b-7ebf2cd44df6 ro console=tty1 console=ttyS0 + ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140 + RelatedPackageVersions: + linux-restricted-modules-4.4.0-135-generic N/A + linux-backports-modules-4.4.0-135-generic N/A + linux-firmware N/A + RfKill: Error: [Errno 2] No such file or directory + Tags: xenial uec-images + Uname: Linux 4.4.0-135-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: + + _MarkForUpload: True + dmi.bios.date: 04/01/2014 + dmi.bios.vendor: SeaBIOS + dmi.bios.version: 1.10.2-1ubuntu1 + dmi.chassis.type: 1 + dmi.chassis.vendor: QEMU + dmi.chassis.version: pc-i440fx-bionic + dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic: + dmi.product.name: Standard PC (i440FX + PIIX, 1996) + dmi.product.version: pc-i440fx-bionic + dmi.sys.vendor: QEMU ** Attachment added: "CurrentDmesg.txt" https://bugs.launchpad.net/bugs/1793106/+attachment/5190125/+files/CurrentDmesg.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1793106 Title: SMB: not reconnecting SOFS shares when a host goes down To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1793106/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
