RE: moving from raw chunks to cooked files
> Yeah, Linus has been trying to get rid of RAW files for many years. I > wish he'd just give it up. Anyway, there is no problem using cooked > files, and migrating the data is as simple as dd'ing the data from the > RAW devices to new filesystem files and then relinking the link paths > that IDS using to access the RAW devices to the filesystem files. This would create 2 files instead of 2 raw devices. Any way to split the raw device into separate files where each file would corresponding to a chunk? I think it might be possible using dd's skip and count options. How I can I change paths in Informix? root dbs is specified in the onconfig file and that's in one chunk fortunately, but I don't know how to change the paths for all the other chunks. I also don't know what you mean by relinking. > You > should use the simplest filesystem available, no journalled filesystems > like EXT3 and EXT4. I would suggest just using an old EXT2 filesystem > as the best choice. It's very low overhead compared to the more modern > filesystems. Makes sense, thanks. > Another option, BTW, would be to use COOKED (aka block) devices rather > than filesystem files. COOKED devices tend to be a little faster than > filesystem files even with DIRECT_IO enabled on both. What do you mean by that; that each chunk or set of chunks would have their own partition on disk? So instead on /dev/raw/raw1 I'd have /dev/sda1 for example? Aleksander Kamenik System Administrator Krediidiinfo AS an Experian Company Phone: +372 665 9649 Email: aleksander@krediidiinfo.ee http://www.krediidiinfo.ee/ http://www.experiangroup.com/ > > Art > > Art S. Kagel > Advanced DataTools (www.advancedatatools.com) > IIUG Board of Directors (art@iiug.org) > > Disclaimer: Please keep in mind that my own opinions are my own > opinions and do not reflect on my employer, Advanced DataTools, the > IIUG, nor any other organization with which I am associated either > explicitly, implicitly, or by inference. Neither do those opinions > reflect those of other individuals affiliated with any entity with > which I am affiliated nor those of the entities themselves. > > > > > On Wed, Aug 25, 2010 at 10:43 AM, Aleksander Kamenik > <aleksander@krediidiinfo.ee> wrote: > > > Hi, > > We're running Suse Linux Enterprise Server on x86 and with the > latest SLES11SP1 release notes comes this announcement: > > "The RAW devices are deprecated and will be removed with one of > the next Service Packs or SUSE Linux Enterprise Server 12." > > I'm about to reinstall Informix onto new drives so might as well > migrate to cooked files. > > What filesystem is recommended? Are there any significant > performance issues nowadays? > > Currently I have two raw devices which contain a total of 18 > chunks. I would like to see them as 18 files on four different > drives/partitions after the migration. I can't find any documentation > on migrating to cooked files. Is this even possible? > > Using Informix 11.50.UC7. > > Regards, > > Aleksander Kamenik > System Administrator > Krediidiinfo AS > an Experian Company > Phone: +372 665 9649 > Email: aleksander@krediidiinfo.ee > > http://www.krediidiinfo.ee/ > http://www.experiangroup.com/ > > > _______________________________________________ > Informix-list mailing list > Informix-list@iiug.org > http://www.iiug.org/mailman/listinfo/informix-list > >