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Ramon van Alteren wrote: |
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|
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> Michiel de Bruijne wrote: |
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> |
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>> Where you able to resolve this? |
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>> |
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>> |
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> Yep I have been able to resolve this by switching to the userspace |
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> nfsd implementation |
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> It appears to be a kernel bug with regard to the combination of LVM2 + |
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> NFS-kernelspace + 9Tb |
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|
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It turned out to be another bug related to reiserfs. |
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For those interested more data is here [1]: |
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http://sourceforge.net/mailarchive/forum.php? |
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forum_id=4930&max_rows=25&style=flat&viewmonth=200511&viewday=1 |
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|
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and here [2]: |
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http://marc.theaimsgroup.com/?l=reiserfs&m=112255940804474&w=2 |
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|
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In short: Although reiserfs reports in it's FAQ that it supports |
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filesystems up to 16Tb with the default options (4K blocks) it supports |
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only 8Tb. It doesn't fail however and appears to work correctly when |
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using the local filesystem, the problems start showing up when using NFS. |
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|
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From the post on [2] this is caused by a bug in reiserfsprogs that |
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doesn't fully check the blockdescriptor when formatting. Apart from that |
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the FAQ entry stating that reiserfs supports filesystems up to 16Tb is |
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just plain wrong. |
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|
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I fixed the problem by using another filesystem. Based on comments on |
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the nfs-ml and the excellent article in last months linuxgazette on |
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filesystem performance we switched to jfs. |
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So far it's holding up very good. We haven't seen the problems |
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reappearing with files in excess of 1Gb |
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Will be stress-testing nfs probably this week. If anybody is interested |
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I could post the data ? |
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Regards, |
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|
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Ramon |
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-- |
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To be stupid and selfish and to have good health are the three requirements for happiness, though if stupidity is lacking, the others are useless. |
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Gustave Flaubert |
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-- |
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