Hi Hendrik and MLUGers One if the major benefits of BTFRS is the ability to record all you diskio and to unwind changes. This means that you can install a software via yum or apt-get (if btfrs is installed on Ubuntu/Mint). and undo an installation of software. I am not aware of the trigger to start and stop logging. It is something for me to research.
In theory, if your Linux system had a succumbed to a powerfailure before a sync'ed poweroff, BTFRS is supposed to be able to do a set of undo's to make the file system clean. Phorix tested BTFRS vs Ext4 and the former was slower. However, over time, it will be tuned and some long program pathlengths will be reworked. I am told and I need to confirm that the reason I find it faster is due to btfrs using a 4k sector size in lieu of the 256 byte sector. More data is transferred via 1 diskio, than via the 256 byte sector by sector read. For small files BTFRS appears advantageous, For very large files, it may not compete with EXT4. Oh well, my next big purchase will probably be an SSD memory drive. I know not how btfrs and ssds work together. Cheers and Regards Leslie Mr. Leslie Satenstein 50 years in Information Technology and going strong. Yesterday was a good day, today is a better day, and tomorrow will be even better. mailto:[email protected] alternative: [email protected] www.itbms.biz www.eclipseguard.com --- On Thu, 11/22/12, Hendrik Boom <[email protected]> wrote: From: Hendrik Boom <[email protected]> Subject: Re: [MLUG] Fedora 18 with btfrs (first impressions with the pre-beta tc9) To: [email protected] Date: Thursday, November 22, 2012, 9:37 PM On Wed, Nov 21, 2012 at 01:00:37PM -0800, Leslie S Satenstein wrote: > I found the tc9 dvd image download, did what any Fedora biggot did, > downloaded it, and wiped out a small hard disk that I keep for playing > around. > > The TC9 is the penultimate iso before the iso file is released at month end. > UEFI is a problem for Fedora, as it is for the Linux Foundation and for your > favourite distribution, (SUSE seems to have it right). > > In setting the installer, one of the selection panels refers to disks and > file systems. I chose the default and after some thought, chose btfrs. The > installation was uneventful. > > After installation, there is the reboot to complete initialization. The > reboot felt faster than booting Ubuntu on the same hardware system with > ext4. (I have 4 Linux distributions arranged on two drives). The drive with > Ubuntu is faster than the one I used for F18. > F18 and btfrs appears even faster than Fedora 17, also on that system. > > For those that are curious, because of btfrs, the system feels faster. > Gnome on F18 is heavily optimized (so they say), and I noticed speed > improvements. > > All the F18 applications from the pre-beta that I tested, work just fine.In > the next few days I will try to add all the codecs and other fine stuff that > I use. > > Yeah, since 2004, I've stuck to Fedora. Even with all the Selinux headaches. > Always enjoyed using Fedora. > > Always found the libdvdcss and other non-free codecs and stuff. I will be > testing the btfrs features to see if I can undo an installation. If so, > wonderful, if I can't, it will be to stay with ext4 and lvm. I've been wondering about the ability of btrfs to recover from file-system daamge -- such as that caused by software bugs, unexpected power failures, and deteriorating disk blocks. Do you know anything on that? I've heard that reiserfs (another tree-based file system) was terrible on that count. -- hendrik _______________________________________________ mlug mailing list [email protected] https://listes.koumbit.net/cgi-bin/mailman/listinfo/mlug-listserv.mlug.ca
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