Hello. I have experienced this situation with the 3.0.4 release of Glusterfs - it was related to a bug that had to do with recursive file deletions (in my case). That bug has been fixed in 3.1.1 which is what I am currently running. Can you give us your Glusterfs version, and a copy of your volume files for server and client? That would help us to help you. Thanks, James -----Original Message----- From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Markus Fr?hlich Sent: Thursday, January 27, 2011 11:03 AM To: gluster-users at gluster.org Subject: sometimes connection errors - glusterfs limit? hi! problem description: 1-3 times a day glusterfs seems to hang - like freezed - network traffic is a few secounds again zero, because there is no glusterfs communication. in the log of the servers, that clients got disconnected and a little bit later connected again but the network traffic seems okay and is not at limit - there are no errors on the networkinterfaces. we also checked cables and switchports on the switches. we think that glusterfs in combination with the I/O is the bottleneck here. average we can say the storage setup is in use with 2/3 read and 1/3 write operations. is there a limitation of volumes, clients, mounts etc. in the glusterfs code? has some one made similar experience or troubles with such a setup? is it possible that to much clients are connected to few servers? has any one some tip for us? ------------------------------------- our setup: two glusterfs servers: * areca raid controller with raid5 setup * 3 LUNs each 11 TB with 70%-99% in use with ext3 formated * SLES11 x86_64 * glusterfs V 3.0.7 45 - 50 glusterfs client servers: * SLES10, SLES11, SLES11 SP1 * glusterfs V 3.0.7 * all VOLs client replicated to the both glusterfs servers ----------------------------------- volume files: server export vols look like this - some options differ: -- volume posix type storage/posix option directory /gluster-storage/projekte/ksc/ option background-unlink yes end-volume volume locks type features/locks subvolumes posix end-volume volume ksc type performance/io-threads option thread-count 16 subvolumes locks end-volume volume server type protocol/server option transport-type tcp option transport.socket.listen-port 7025 option auth.addr.ksc.allow 10.0.1.* subvolumes ksc end-volume -- volume posix type storage/posix option directory /gluster-storage/projekte/hosting/ option o-direct enable option background-unlink yes end-volume volume locks type features/locks subvolumes posix end-volume volume hosting2 type performance/io-threads option thread-count 16 subvolumes locks end-volume volume server type protocol/server option transport-type tcp option transport.socket.listen-port 7005 option auth.addr.hosting2.allow 10.0.1.* subvolumes hosting2 end-volume -- client repl. mount VOL files: volume vgfs-01-001-ksc type protocol/client option transport-type tcp option remote-host vgfs-01-001 option remote-port 7025 option ping-timeout 10 option remote-subvolume ksc end-volume # distribute volume distribute1-ksc type cluster/distribute option lookup-unhashed auto option min-free-disk 5% subvolumes vgfs-01-001-ksc end-volume volume vgfs-01-002-ksc type protocol/client option transport-type tcp option remote-host vgfs-01-002 option remote-port 7025 option ping-timeout 10 option remote-subvolume ksc end-volume # distribute volume distribute2-ksc type cluster/distribute option lookup-unhashed auto option min-free-disk 5% subvolumes vgfs-01-002-ksc end-volume volume ksc-data-replicate type cluster/replicate subvolumes distribute1-ksc distribute2-ksc end-volume volume iocache type performance/io-cache option cache-size 64MB #1GB supported option cache-timeout 1 subvolumes ksc-data-replicate end-volume volume quick-read type performance/quick-read # option cache-timeout 10 (1 second) # option max-file-size 1048576 (64Kb) subvolumes iocache end-volume volume trace type debug/trace subvolumes quick-read # option include open,close,create,readdir,opendir,closedir # option exclude lookup,read,write end-volume -- volume vgfs-01-001-hosting type protocol/client option transport-type tcp option remote-host vgfs-01-001 option remote-port 7005 option ping-timeout 20 option remote-subvolume hosting end-volume volume vgfs-01-002-hosting type protocol/client option transport-type tcp option remote-host vgfs-01-002 option remote-port 7005 option ping-timeout 20 option remote-subvolume hosting end-volume # distribute volume distribute1-hosting type cluster/distribute option lookup-unhashed yes option min-free-disk 5% subvolumes vgfs-01-001-hosting end-volume # distribute volume distribute2-hosting type cluster/distribute option lookup-unhashed yes option min-free-disk 5% subvolumes vgfs-01-002-hosting end-volume volume backup-data-replicate type cluster/replicate subvolumes distribute1-hosting distribute2-hosting subvolumes distribute2-hosting end-volume volume readahead type performance/read-ahead option page-count 16 # cache per file = (page-count x page-size) subvolumes backup-data-replicate end-volume volume iocache type performance/io-cache option cache-size 1024MB #1GB supported option cache-timeout 1 subvolumes readahead end-volume volume iothreads type performance/io-threads option thread-count 6 # default is 16 subvolumes iocache end-volume volume quickread type performance/quick-read option cache-timeout 30 option max-file-size 1024000 subvolumes iothreads end-volume -- regards markus -- Mit freundlichen Gr?ssen Markus Fr?hlich Techniker ________________________________________________________ Xidras GmbH Stockern 47 3744 Stockern Austria Tel: +43 (0) 2983 201 30503 Fax: +43 (0) 2983 201 305039 Email: markus.froehlich at xidras.com Web: http://www.xidras.com FN 317036 f | Landesgericht Krems | ATU64485024 ________________________________________________________________________________ VERTRAULICHE INFORMATIONEN! 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