FAQ
Many people seem to wait for the announcement of CentOS 6.0, so I want
to share some test results I did with SL 6.0..

The actual 6.0 kernel can NOT allocate tape buffers when the server is
heavily loaded at least on some LSILogic hardware.
There is a big problem of slab buffer increase that can cause
reboot/freeze of the server under load. Reported by many and verified by
me :-(

So perhaps it's a good idea to wait for 6.1 for mission critical servers..

Gerhard Schneider

--
Gerhard Schneider e-Mail:gs at ilsb.tuwien.ac.at
Institute of Lightweight Design and Tel.: +43 1 58801 31716
Structural Biomechanics (E317) Fax.: +43 1 58801 31799
Vienna University of Technology / Austria DVR: 0005886
A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/

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  • Rainer Traut at May 18, 2011 at 4:22 am

    Am 18.05.2011 10:15, schrieb Gerhard Schneider:
    Many people seem to wait for the announcement of CentOS 6.0, so I want
    to share some test results I did with SL 6.0..

    The actual 6.0 kernel can NOT allocate tape buffers when the server is
    heavily loaded at least on some LSILogic hardware.
    There is a big problem of slab buffer increase that can cause
    reboot/freeze of the server under load. Reported by many and verified by
    me :-(

    So perhaps it's a good idea to wait for 6.1 for mission critical servers..
    Is there any bugzilla report for this?
    SL or redhat?

    Thx
    Rainer
  • Gerhard Schneider at May 18, 2011 at 12:34 pm

    Is there any bugzilla report for this?
    SL or redhat?
    Thx
    Rainer
    Not from my side. I'm CentOS user - only testing 6.0

    The tape issue has been discussed on the linux-scsi mailing list 6
    months ago - including some fix - and there was a bug report for the
    Ubuntu 2.6.32 kernel.

    The slab issue has been discussed in the rhelv6-list in February.

    Sorry, but the large servers I used for testing are back in business
    with CentOS 5.6 after playing around for one week (it's my way to check
    that issues are not hardware related).

    Gerhard Schneider

    --
    Gerhard Schneider
    Institute of Lightweight Design and e-Mail: gs at ilsb.tuwien.ac.at
    Structural Biomechanics (E317) Tel.: +43 664 60 588 3171
    Vienna University of Technology / Austria Fax: +43 1 58801 31799
    A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/~gs/


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  • Markus Falb at May 18, 2011 at 12:42 pm

    On 18.5.2011 18:34, Gerhard Schneider wrote:
    Is there any bugzilla report for this?
    SL or redhat?
    Thx
    Rainer
    Not from my side. I'm CentOS user - only testing 6.0
    If you dont do a bugzilla, it wont improve.

    --
    Kind Regards, Markus Falb

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