-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody,
How can I tune the debian 2.6.32-5-amd64 kernel for better performance with open-iscsi and/or the debian 3.2.0-4-amd64 kernel on the tgtd target? We got a tomcat application that uses a lot of small small files and an virtual machine with local storage the performance is fine, but if the virtual machine uses a disk over iscsi its becomes unusable. We tried xfs and ext4 with noatime, but so far no real improvements. When I look with iotop at the kvm process the vm uses max 4 a 5 MB/s disk access witch should be fine, (it handles 40/70MB/s with about 12 vms and nethogs shows 40MB/s to the iscisd) # sysctl --all http://paste.debian.net/hidden/c5d171b5/ # iscsiadm --mode node --targetname iqn.2012-10.nl.exmp:storage.iscsi0 - --portal 192.168.35.6:3260 # BEGIN RECORD 2.0-873 node.name = iqn.2012-10.nl.hivos:storage.iscsi0 node.tpgt = 1 node.startup = automatic node.leading_login = No iface.hwaddress = <empty> iface.ipaddress = <empty> iface.iscsi_ifacename = default iface.net_ifacename = <empty> iface.transport_name = tcp iface.initiatorname = <empty> iface.bootproto = <empty> iface.subnet_mask = <empty> iface.gateway = <empty> iface.ipv6_autocfg = <empty> iface.linklocal_autocfg = <empty> iface.router_autocfg = <empty> iface.ipv6_linklocal = <empty> iface.ipv6_router = <empty> iface.state = <empty> iface.vlan_id = 0 iface.vlan_priority = 0 iface.vlan_state = <empty> iface.iface_num = 0 iface.mtu = 0 iface.port = 0 node.discovery_address = 192.168.35.6 node.discovery_port = 3260 node.discovery_type = send_targets node.session.initial_cmdsn = 0 node.session.initial_login_retry_max = 8 node.session.xmit_thread_priority = -20 node.session.cmds_max = 128 node.session.queue_depth = 32 node.session.nr_sessions = 1 node.session.auth.authmethod = None node.session.auth.username = <empty> node.session.auth.password = <empty> node.session.auth.username_in = <empty> node.session.auth.password_in = <empty> node.session.timeo.replacement_timeout = 480 node.session.err_timeo.abort_timeout = 15 node.session.err_timeo.lu_reset_timeout = 30 node.session.err_timeo.tgt_reset_timeout = 30 node.session.err_timeo.host_reset_timeout = 60 node.session.iscsi.FastAbort = Yes node.session.iscsi.InitialR2T = No node.session.iscsi.ImmediateData = Yes node.session.iscsi.FirstBurstLength = 262144 node.session.iscsi.MaxBurstLength = 16776192 node.session.iscsi.DefaultTime2Retain = 60 node.session.iscsi.DefaultTime2Wait = 5 node.session.iscsi.MaxConnections = 4 node.session.iscsi.MaxOutstandingR2T = 1 node.session.iscsi.ERL = 0 node.conn[0].address = 192.168.35.6 node.conn[0].port = 3260 node.conn[0].startup = manual node.conn[0].tcp.window_size = 524288 node.conn[0].tcp.type_of_service = 0 node.conn[0].timeo.logout_timeout = 15 node.conn[0].timeo.login_timeout = 15 node.conn[0].timeo.auth_timeout = 45 node.conn[0].timeo.noop_out_interval = 15 node.conn[0].timeo.noop_out_timeout = 30 node.conn[0].iscsi.MaxXmitDataSegmentLength = 0 node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144 node.conn[0].iscsi.HeaderDigest = None node.conn[0].iscsi.DataDigest = None node.conn[0].iscsi.IFMarker = No node.conn[0].iscsi.OFMarker = No # END RECORD Kind regards, Jelle de Jong -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iJwEAQECAAYFAlN7VfIACgkQ1WclBW9j5HnOBgP+MfYMt2caYCP4eQLwXreIgkf4 urbPsoVuHON0X3/6bBWKmULXqwq83e2rLpT9FauMEd5tkkWicZsd/o1JxiMa4yLT tx2phyMM9TfXP3ACWi1iqWONop/GOfC1yjdRY5oU9dL20YT72iHTHhC8gk1Kq+uW 5cMYof3A8Wc4xNfcS5s= =u8RH -----END PGP SIGNATURE----- -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
