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Slow NFS Copies - SCO

Using OpenServer 5.0.5 on several Proliant DL580s, we are experiencing slowwwwww NFS mount copies which are causing us headaches. We have a DL580 which has the root filesystem on 2 raided SCSI drives on the on-board CLAD controller giving us about 18gig, 3 raided SCSI drives external on a CISS controller giving us 4 filesystems over about 24gig and 8 raided SCSI drives on the same CISS controller giving us a final two filesystems spilt equally over about 243gig. The two large filesystems are exported and mounted at bootup using NFS to three other DL580's. When these servers are copying ...

  1. #1

    Default Slow NFS Copies

    Using OpenServer 5.0.5 on several Proliant DL580s, we are experiencing
    slowwwwww NFS mount copies which are causing us headaches.

    We have a DL580 which has the root filesystem on 2 raided SCSI drives
    on the on-board CLAD controller giving us about 18gig, 3 raided SCSI
    drives external on a CISS controller giving us 4 filesystems over
    about 24gig and 8 raided SCSI drives on the same CISS controller
    giving us a final two filesystems spilt equally over about 243gig.

    The two large filesystems are exported and mounted at bootup using NFS
    to three other DL580's. When these servers are copying data using
    cpio or cp (the servers may be copying at the same time as the others
    or on their own) there is a noticeable slow down (grinding to a halt!)
    of the data transfer.

    I'm aware of the df -v bug which shows the used space incorrect as
    dfspace reports around 50% free space on the two filesystems (about
    60gig each on both) whereas df -v shows only around 12% used (but the
    free/used blocks is correct).
    We have a user that can only use df -v (within a login script) and
    they report that if they free up some space to below 10% used then the
    speed of the data transfer improves.

    Obviously the df -v figure is misleading and I have monitored the
    dfspace figures for a fortnight and the amount of data on the
    filesystems varies between 81gig and 86gig.

    I've tried changing the buffer size on the mount from the default 8kb
    down to 4/2/1kb which doesn't help, ftp from speeds are excellent so I
    don't suspect a network problem. The servers are patched and using
    the most suitable Compaq drivers.

    Can't think of anything else relevant but I'm sure someone will think
    of something to ask.

    Thanks
    JWR Guest

  2. #2

    Default Re: Slow NFS Copies

    JWR wrote: 

    Check out /etc/conf/pack.d/nfs/space.c, particularly the comments
    about nfs_server_async_writes.

    Mike

    --
    Michael Brown

    The Kingsway Group
    Mike Guest

  3. #3

    Default Re: Slow NFS Copies

    Mike Brown <ca> wrote in message news:<ca>... 

    Thanks for the suggestion.

    I've tried turning the async writes on for two different machines to
    test the result and I actually got a slower transfer speed than I had
    without changing anything. Although this was on two lower spec
    Proliants I half expect the same result if I change the DL580's.

    I'm in an awkward position in that I cannot make changes willy-nilly
    on the DL580s as they are live servers and I don't have anything
    nearly as high spec'ed to test on.

    The SCO Performance Guide mentions the nfsd daemons but nfsstat -c
    looks ok.

    (Now I kneel and pray for Bela to make an appearence! :-)
    JWR Guest

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