Date: Tue, 29 Mar 2011 23:18:45 +0200 From: Claus Guttesen <kometen@gmail.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: Alexander Leidinger <Alexander@leidinger.net>, Rick Macklem <rmacklem@uoguelph.ca>, FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: zfs, nfs and zil Message-ID: <BANLkTi=1N0XRePn2R3n3fi2Z-woezcRTRw@mail.gmail.com> In-Reply-To: <20110329205527.GA77676@icarus.home.lan> References: <BANLkTinZvLDkmUNHmDGQpQFRr31s=hyHuQ@mail.gmail.com> <113777190.2282503.1301350571721.JavaMail.root@erie.cs.uoguelph.ca> <BANLkTin6t=RUo8UHRg47ETZWajc2CWTJZg@mail.gmail.com> <20110329155149.167768mu74in1ios@webmail.leidinger.net> <BANLkTi=M9wRxV=weca4LKFb%2BrLzu4bh9iw@mail.gmail.com> <20110329205527.GA77676@icarus.home.lan>
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>> It's a supermicro server with dual igb-nics on the mainboard. I did >> try other cables and other ports on the switch (hp procurve). I don't >> have access to the server atm. but I'll get the chip-info in a day or >> two. Both ip-addresses are on same subnet. >> >> Speed is autonegotiated to 1 GB full duplex on server and switch. No >> errors detected using netstat or on switch. > > Something tells me (gut feeling) the virtualisation part is probably > somehow responsible for the problem, quote: > >> I'm mounting the FreeBSD-server from a couple of vmware esxi 4.1 >> servers using nfs, but when there is alot of i/o the server becomes >> unresponsive, easily triggered by installing ie. ms-sql. The server >> itself is up but is not reachable from the network. When I take the >> nic down and up again connection to the network is reestablished >> (ip-wise). > > Can you remove ESXi from the picture and see if the problem continues? > If it does, we should probably pull Jack Vogel into the discussion, as > Supermicro predominantly uses Intel-based NICs. =A0He'll need output from > "pciconf -lvcb" and "dmesg" to assist. > > But before pulling him in, please see if you can remove ESXi from the > picture. I've done some testing i Feb. when I initially installed the server with samba and iscsi from a windows 7 client and managed to get approx. 118 MB/s on plain GB nics. I copied some 30-40 GB and never had a hickup. Then I mounted iscsi from vmware and migrated some windows-servers and it behaved well. When we moved to nfs the peculiar problems began to arise. I will redo my testing from my windows 7 client to verify that my memory do not put a spell on me! I've also begun to move some virtual windows-servers back to iscsi and mount the iscsi-volume from several vmware-servers. Vmfs is cluster-aware and should handle it just fine. In a few days I'll move a server I know causes problems to iscsi and I'll post the results. Thank you for your input! :-) --=20 regards Claus When lenity and cruelty play for a kingdom, the gentler gamester is the soonest winner. Shakespeare twitter.com/kometen
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