Messages in this thread |  | | Date | Thu, 15 Feb 2007 23:59:14 +0100 (CET) | From | Juan Piernas Canovas <> | Subject | Re: [ANNOUNCE] DualFS: File System with Meta-data and Data Separation |
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Hi Jörn,
On Thu, 15 Feb 2007, [utf-8] Jörn Engel wrote:
> On Thu, 15 February 2007 19:38:14 +0100, Juan Piernas Canovas wrote: >> >> The patch for 2.6.11 is not still stable enough to be released. Be patient >> ;-) > > While I don't want to discourage you, this is about the point in > development where most log structured filesystems stopped. Doing a > little web research, you will notice those todo-lists with "cleaner" > being the top item for...years! > > Getting that one to work robustly is _very_ hard work and just today > I've noticed that mine was not as robust as I would have liked to think. > Also, you may note that by updating to newer kernels, the VM writeout > policies can change and impact your cleaner. To an extent even that you > had a rock-solid filesystem with 2.6.18 and thing crumble between your > fingers in 2.6.19 or later. > > If the latter happens, most likely the VM is not to blame, it just > proved that your cleaner is still getting some corner-cases wrong and > needs more work. There goes another week of debugging. :( > > Jörn > Actually, the version of DualFS for Linux 2.4.19 implements a cleaner. In our case, the cleaner is not really a problem because there is not too much to clean (the meta-data device only contains meta-data blocks which are 5-6% of the file system blocks; you do not have to move data blocks).
Anyway, thank you for warning me ;-)
Regards,
Juan.
-- D. Juan Piernas Cánovas Departamento de Ingeniería y Tecnología de Computadores Facultad de Informática. Universidad de Murcia Campus de Espinardo - 30080 Murcia (SPAIN) Tel.: +34968367657 Fax: +34968364151 email: piernas@ditec.um.es PGP public key: http://pgp.rediris.es:11371/pks/lookup?search=piernas%40ditec.um.es&op=index
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