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