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Am 23.03.2011 14:04, schrieb Mr. Jarry: |
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> On Wed, Mar 23, 2011 at 10:09 AM, Volker Armin Hemmann |
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> <volkerarmin@××××××××××.com> wrote: |
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> |
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>> And if you don't care about barriers, jfs might be a good choice. |
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> |
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> Knowing nothing about "barriers" I tried to find some info and |
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> came accross this article: |
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> |
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> http://searchenterpriselinux.techtarget.com/tip/Deciding-when-to-use-Linux-file-system-barriers |
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> |
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> It says, barriers can not work with device mapper (raid, lvm). |
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> If it is true (?) then because of having all partitions in raid1 (md), |
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> I need not worry about barriers. Whatever filesystem I picked out, |
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> I could not use barriers... |
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> |
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> Jarry |
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> |
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Kernel changes claim barrier support for DM and MD beginning at 2.6.33 [1]. |
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Some support was also added in 2.6.31, 2.6.30 and 2.6.29. |
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This thread [2] leaves me with the impression that the same patches |
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providing support in DM and MD also solved the issue for LVM. |
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The article you cite might be correct in the context of RHEL-5.5 and |
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SLED-10 which use a much older kernel (2.6.24 if I'm not mistaken). |
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[1] http://kernelnewbies.org/Linux_2_6_33 |
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[2] http://lwn.net/Articles/326597/ |
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Also interesting: |
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http://lwn.net/Articles/400541/ |
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Hope this helps, |
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Florian Philipp |