Re: Resize command syntax wrong?
On 12/1/2011 1:46 AM, Helmut Hullen wrote: balance != resize I know. p.e. Start with 1 disk with 2 GB and 1 disk with 4 GByte Fill it with 2 Gbyte data, each disk gets 1 GByte. Add a disk with 10 GByte, run balance: each disk gets about 700 MByte. That has nothing to do with resize. Right, so why are you talking about balance when this thread is about resize? -- 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: Resize command syntax wrong?
Hallo, Phillip, Du meintest am 01.12.11: balance != resize [...] That has nothing to do with resize. Right, so why are you talking about balance when this thread is about resize? Ooops - sorry! Viele Gruesse! Helmut -- 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
Resize command syntax wrong?
Currently the resize command is under filesystem, and takes a path to the mounted filesystem. This seems wrong to me. Shouldn't it be under device, and take a path to a device to resize? Otherwise, how can a resize operation when you have multiple devices make any sense? -- 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: Resize command syntax wrong?
Hallo, Phillip, Du meintest am 30.11.11: Currently the resize command is under filesystem, and takes a path to the mounted filesystem. This seems wrong to me. Shouldn't it be under device, and take a path to a device to resize? No - it's a filesystem operation. p.e. You start with a system of 2 disks. They get filled nearly simultaneously. Then you add a 3rd disk (which is empty at that time). Now it's a good idea to run balance for equalizing the filling. Viele Gruesse! Helmut -- 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: Resize command syntax wrong?
On 30 Nov 2011 19:59:00 +0100 Helmut Hullen hul...@t-online.de wrote: Currently the resize command is under filesystem, and takes a path to the mounted filesystem. This seems wrong to me. Shouldn't it be under device, and take a path to a device to resize? No - it's a filesystem operation. Are you sure about that? p.e. You start with a system of 2 disks. They get filled nearly simultaneously. Then you add a 3rd disk (which is empty at that time). Now it's a good idea to run balance for equalizing the filling. What if I need to replace an individual device with a smaller or a larger one? -- With respect, Roman ~~~ Stallman had a printer, with code he could not see. So he began to tinker, and set the software free. signature.asc Description: PGP signature
Re: Resize command syntax wrong?
On Thursday, 01 December, 2011 01:15:47 you wrote: On 30 Nov 2011 19:59:00 +0100 Helmut Hullen hul...@t-online.de wrote: Currently the resize command is under filesystem, and takes a path to the mounted filesystem. This seems wrong to me. Shouldn't it be under device, and take a path to a device to resize? No - it's a filesystem operation. Are you sure about that? I confirm that. In fact btrfs filesystem resize doesn't change the device(s). It only expands or shrinks the filesystem. Of course if you want to expand the filesystem, you have to expand the underling device *before*. Otherwise if you want to shrink the filesystem, you have to not shrink the device before shrinking the filesystem. p.e. You start with a system of 2 disks. They get filled nearly simultaneously. Then you add a 3rd disk (which is empty at that time). Now it's a good idea to run balance for equalizing the filling. What if I need to replace an individual device with a smaller or a larger one? This is a more simpler case As general rule: # btrfs device add new device btrfs root # btrfs device delete old device btrfs root May be that the device removing is blocked in some RAID setup. -- gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) kreij...@inwind.it Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512 -- 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: Resize command syntax wrong?
Hallo, Roman, Du meintest am 01.12.11: What if I need to replace an individual device with a smaller or a larger one? 1) add the new device 2) balance (may be it's not necessary) 3) run remove for the individual device 4) remove it 5) balance Viele Gruesse! Helmut -- 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: Resize command syntax wrong?
On 30 Nov 2011 20:43:00 +0100 Helmut Hullen hul...@t-online.de wrote: Hallo, Roman, Du meintest am 01.12.11: What if I need to replace an individual device with a smaller or a larger one? 1) add the new device 2) balance (may be it's not necessary) 3) run remove for the individual device 4) remove it 5) balance Okay, adding a new device wasn't the best example to explain my point. What I meant is resizing a BTRFS partition, enlarging it or shrinking it as needed, while still on the same device. Of course in the enlarge scenario the partition(or the LV) is resized upwards first, and then the filesystem, and on shrinking it's vice versa. Suppose I used half of a 1000GB disk for BTRFS (a 500GB partition), and the second half for something else. Now I want to remove this other partition, and make BTRFS occupy the whole disk. Resizing in both 'directions' seems to work very well on single-device BTRFS filesystems, and also it's very useful that BTRFS is almost the only modern FS (besides ext4) that can be shrinked. But with multi-device filesystems, don't you agree it's non-obvious how (or is not even possible) to resize the areas that BTRFS occupies on individual devices? -- With respect, Roman ~~~ Stallman had a printer, with code he could not see. So he began to tinker, and set the software free. signature.asc Description: PGP signature
Re: Resize command syntax wrong?
Hallo, Phillip, Du meintest am 30.11.11: You start with a system of 2 disks. They get filled nearly simultaneously. Then you add a 3rd disk (which is empty at that time). Now it's a good idea to run balance for equalizing the filling. balance != resize I know. p.e. Start with 1 disk with 2 GB and 1 disk with 4 GByte Fill it with 2 Gbyte data, each disk gets 1 GByte. Add a disk with 10 GByte, run balance: each disk gets about 700 MByte. That has nothing to do with resize. Viele Gruesse! Helmut -- 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
