slowdown on internal harddisks

From: Cor Bosman (cor_at_xs4all.nl)
Date: 01/04/04

  • Next message: Uwe Doering: "Re: slowdown on internal harddisks" 
    Date: Sun, 4 Jan 2004 11:52:21 +0100 (CET)
To: freebsd-performance@freebsd.org

    Hi all, im running a large usenet setup (30+ servers, 20TB or so) and am
    running into some trouble with one of the servers.

    It's a dual Xeon 2.6, 4GB memory, mirrored 2 x 17GB / on ADAPTEC 2015S (asr)
    extra 70GB disk on the same asr controller, and 3 x 1.5 TB on
    Qlogic ISP 2300 PCI FC-AL Adapter (isp) set up as 6 750GB partitions.

    This server pushes out about 300mbit of data on an Intel Pro 1000 (em).
    Im also using a 1GB MFS which i need to support a very high amount of seeks
    on a usenet history file (300 MB used).

    As the server starts doing lots of io on the Qlogic controller all disk writes
    seem to drop to about 0. Also on the MFS, and on the internal asr controller.
    Copying a file from any disk to any other, even to the unused extra 70GB
    disk has a max throughput of about 50KB/s. Read performance is still ok, it's
    just write()s that are slow. (cp-ing to /dev/null is fast).

    Ive tried all kinds of tweaks but cant seem to find the cause of this.
    It's especially weird because another, identical, server, with the same load
    does not show this problem.

    Any ideas?

    Regards,

    Cor

    _______________________________________________
    freebsd-performance@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-performance
    To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"

  • Next message: Uwe Doering: "Re: slowdown on internal harddisks"

    Relevant Pages

    • Re: How to verify/fix High Disk Read Latencies in Exch2003 ?
      ... Exchange production servers are, the SAN is an EMC CX600. ... >>> current log file on disk and continues until data in the log buffers ... Comingling occurs whe two or more LUNs reside ...
      (microsoft.public.exchange.admin)
    • Re: 2003 Enteprise SP2 or 2003 Enteprise R2
      ... If you run setup from disk 2 of the R2 set it will install this: ... SP 2 on *all* Win 2k3 servers. ... SP 2 is an OS upgrade that should be ...
      (microsoft.public.windows.server.general)
    • Re: LVM Documentation
      ... what were you trying to do with your disk? ... DiskSuite isn't really intended to do quite as much as HP-UX LVM. ... that mirroring the boot drives should be done in hardware, ... where there was not yet any functional network and the servers had no ...
      (comp.sys.hp.hpux)
    • Re: HBA connection
      ... In Windows Server 2003 Cluster server has a switch that when enabled, ... cluster-managed disk. ... > We bought new IBM Blade servers and putting in production> soon. ... I have a basic question about the clustering> servers, many places Microsoft recommended OS and Shared> Disk should be connected in different SCSI cards. ...
      (microsoft.public.windows.server.clustering)
    • Re: SSA disk sharing
      ... Taken from the SSA Users' Guide: ... you are allowed a max of 2 servers in the loops. ... I would create a vg just for that logical disk. ... > from one host to all other hosts connected to the same disk drive. ...
      (AIX-L)