Re: Is there any data recovery tool?
OK. On Wed, Feb 22, 2012 at 8:58 PM, Duncan <1i5t5.dun...@cox.net> wrote: > qasdfgtyuiop posted on Tue, 21 Feb 2012 20:11:06 +0800 as excerpted: > >> I'm using GNU/linux with btrfs root. My filesystem is created with >> command "mkfs.btrfs /dev/sda" . Today I'm trying to install Microsoft >> Windows 7 on /dev/sdb , a 16GB esata ssd. After the installation, I >> found that Windows create a "hidden" NTFS partition called "System >> Reserved" on the first 100MB of my /dev/sda and that my btrfs filesystem >> was lost! I have searched google for help but I got no useful >> information. Is there any data recovery tools? > > The btrfs kernel option says: > > Btrfs filesystem (EXPERIMENTAL) Unstable disk format > > Its description says in part: > > Btrfs is highly experimental, and THE DISK FORMAT IS NOT YET FINALIZED. > You should say N here unless you are interested in testing Btrfs with non- > critical data. [...] If unsure, say N. > > The front page and getting started pages of the wiki (see URL below) > also heavily emphasize the development aspect and backups, and the source > code section has this to say: > > Warning, Btrfs evolves very quickly do not test it unless: > > You have good backups and you have tested the restore capability > You have a backup installation that you can switch to when > something breaks > You are willing to report any issues you find > You can apply patches and compile the latest btrfs code against your > kernel (quite easy with git and dkms, see below) > You acknowledge that btrfs may eat your data > Backups! Backups! Backups! > > > Given all that, any data you store on btrfs is by definition not particularly > important, either because you have it backed up in a more stable format > elsewhere (which might be the net, or local), or because the data really > /isn't/ particularly important to you in the first place, or you'd have > made and tested backups (naturally, always test recovery from your backups, > as an untested backup is worse than none, since it's likely to give you > a false sense of security) before putting it on the after all still > experimental and under heavy development btrfs in the first place. > > Thus, you shouldn't need to worry about a data recovery tool, since > you can either simply restore from backups (which since you tested > recovery, you're already familiar with the recovery procedures), > or the data was simply garbage you were using for testing and didn't > care about losing anyway. > > > Never-the-less, yes, there's a recovery tool, naturally experimental > just like the filesystem itself at this point, but there is one. Testing > and suggestions for improvements, especially with patches, will be > welcomed. > > It seems you need to read up on the wiki, which covers this among other > things. There's an older version on btrfs.wiki.kernel.org, but that's > not updated ATM due to restrictions in place since the kernel.org > breakin some months ago. The "temporary" (but six months and counting, > I believe) replacement is at btrfs.ipv5.de: > > http://btrfs.ipv5.de/index.php?title=Main_Page > > The restore and find-root commands from btrfs-progs are specifically > covered on this page: > > http://btrfs.ipv5.de/index.php?title=Restore > > If you wish to try a newer copy of btrfs-progs (after all, it's all > still in development, and bugs are fixed all the time), you'll also want > to read: > > http://btrfs.ipv5.de/index.php?title=Getting_started#Compiling_Btrfs_from_sources > > > -- > Duncan - List replies preferred. No HTML msgs. > "Every nonfree program has a lord, a master -- > and if you use the program, he is your master." Richard Stallman > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: Is there any data recovery tool?
qasdfgtyuiop posted on Tue, 21 Feb 2012 20:11:06 +0800 as excerpted: > I'm using GNU/linux with btrfs root. My filesystem is created with > command "mkfs.btrfs /dev/sda" . Today I'm trying to install Microsoft > Windows 7 on /dev/sdb , a 16GB esata ssd. After the installation, I > found that Windows create a "hidden" NTFS partition called "System > Reserved" on the first 100MB of my /dev/sda and that my btrfs filesystem > was lost! I have searched google for help but I got no useful > information. Is there any data recovery tools? The btrfs kernel option says: Btrfs filesystem (EXPERIMENTAL) Unstable disk format Its description says in part: Btrfs is highly experimental, and THE DISK FORMAT IS NOT YET FINALIZED. You should say N here unless you are interested in testing Btrfs with non- critical data. [...] If unsure, say N. The front page and getting started pages of the wiki (see URL below) also heavily emphasize the development aspect and backups, and the source code section has this to say: Warning, Btrfs evolves very quickly do not test it unless: You have good backups and you have tested the restore capability You have a backup installation that you can switch to when something breaks You are willing to report any issues you find You can apply patches and compile the latest btrfs code against your kernel (quite easy with git and dkms, see below) You acknowledge that btrfs may eat your data Backups! Backups! Backups! Given all that, any data you store on btrfs is by definition not particularly important, either because you have it backed up in a more stable format elsewhere (which might be the net, or local), or because the data really /isn't/ particularly important to you in the first place, or you'd have made and tested backups (naturally, always test recovery from your backups, as an untested backup is worse than none, since it's likely to give you a false sense of security) before putting it on the after all still experimental and under heavy development btrfs in the first place. Thus, you shouldn't need to worry about a data recovery tool, since you can either simply restore from backups (which since you tested recovery, you're already familiar with the recovery procedures), or the data was simply garbage you were using for testing and didn't care about losing anyway. Never-the-less, yes, there's a recovery tool, naturally experimental just like the filesystem itself at this point, but there is one. Testing and suggestions for improvements, especially with patches, will be welcomed. It seems you need to read up on the wiki, which covers this among other things. There's an older version on btrfs.wiki.kernel.org, but that's not updated ATM due to restrictions in place since the kernel.org breakin some months ago. The "temporary" (but six months and counting, I believe) replacement is at btrfs.ipv5.de: http://btrfs.ipv5.de/index.php?title=Main_Page The restore and find-root commands from btrfs-progs are specifically covered on this page: http://btrfs.ipv5.de/index.php?title=Restore If you wish to try a newer copy of btrfs-progs (after all, it's all still in development, and bugs are fixed all the time), you'll also want to read: http://btrfs.ipv5.de/index.php?title=Getting_started#Compiling_Btrfs_from_sources -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Is there any data recovery tool?
Hi, I'm using GNU/linux with btrfs root. My filesystem is created with command "mkfs.btrfs /dev/sda" . Today I'm trying to install Microsoft Windows 7 on /dev/sdb , a 16GB esata ssd. After the installation, I found that Windows create a "hidden" NTFS partition called "System Reserved" on the first 100MB of my /dev/sda and that my btrfs filesystem was lost! I have searched google for help but I got no useful information. Is there any data recovery tools? Thanks -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
