Re: What's the minimum size I can shrink my FS to?
On Tue, Nov 6, 2012 at 9:45 AM, David Sterba d...@jikos.cz wrote: On Sat, Nov 03, 2012 at 03:10:52PM +1030, Jordan Windsor wrote: [root@archpc ~]# btrfs fi df /home/jordan/Storage/ Data: total=580.88GB, used=490.88GB This is getting full, 84%, there is not much chance of getting rid of substantially many 1G-chunks through the 'usage=1' balance filter. Some of the space between 490G and 580G will be spent on slack space and fragmentation, the rest may be packed together by a higher usage= value (but will be slower due to relocating more data). System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=13.01GB, used=1001.83MB If you intend to shrink a filesystem, all space group types must be taken into account, so here you have at least 580G + 2x32M + 4M + 2x13G = ~607G [root@archpc ~]# btrfs fi sh failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 606.96GB path /dev/sda6 ^^ confirmed :) So basically you cannot go under this number when shrinking. I think you can squeeze the metadata space down to 2G (or maybe to 1G, it's getting very close to 1G so hard to guess) by the -musage= filter AND using at least 3.7 kernel (or 3.6+ chris' for-linus branch) with the fixed over-allocation bug (otherwise the size will stay pinned at 2% of the filesystem size). david Thanks for the info! Shame I can't save space though. Thanks anyway. -- 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: What's the minimum size I can shrink my FS to?
On Sat, Nov 03, 2012 at 03:10:52PM +1030, Jordan Windsor wrote: [root@archpc ~]# btrfs fi df /home/jordan/Storage/ Data: total=580.88GB, used=490.88GB This is getting full, 84%, there is not much chance of getting rid of substantially many 1G-chunks through the 'usage=1' balance filter. Some of the space between 490G and 580G will be spent on slack space and fragmentation, the rest may be packed together by a higher usage= value (but will be slower due to relocating more data). System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=13.01GB, used=1001.83MB If you intend to shrink a filesystem, all space group types must be taken into account, so here you have at least 580G + 2x32M + 4M + 2x13G = ~607G [root@archpc ~]# btrfs fi sh failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 606.96GB path /dev/sda6 ^^ confirmed :) So basically you cannot go under this number when shrinking. I think you can squeeze the metadata space down to 2G (or maybe to 1G, it's getting very close to 1G so hard to guess) by the -musage= filter AND using at least 3.7 kernel (or 3.6+ chris' for-linus branch) with the fixed over-allocation bug (otherwise the size will stay pinned at 2% of the filesystem size). david -- 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
What's the minimum size I can shrink my FS to?
Hello, I'm trying to shrink my Btrfs filesystem to the smallest size it can go, here's the information: failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 605.98GB path /dev/sda6 Btrfs Btrfs v0.19 Data: total=580.90GB, used=490.88GB System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=12.51GB, used=1001.61MB Here's the command I use to resize: [root@archpc ~]# btrfs file res 500g /home/jordan/Storage/ Resize '/home/jordan/Storage/' of '500g' ERROR: unable to resize '/home/jordan/Storage/' - No space left on device I was wondering if that size doesn't work then what's the minimum I can shrink to? 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
Re: What's the minimum size I can shrink my FS to?
Run btrfs balance start -musage=1 -dusage=1, and then try it again. This may require update btrfs tools however. On Fri, Nov 2, 2012 at 10:09 PM, Jordan Windsor jorda...@gmail.com wrote: Hello, I'm trying to shrink my Btrfs filesystem to the smallest size it can go, here's the information: failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 605.98GB path /dev/sda6 Btrfs Btrfs v0.19 Data: total=580.90GB, used=490.88GB System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=12.51GB, used=1001.61MB Here's the command I use to resize: [root@archpc ~]# btrfs file res 500g /home/jordan/Storage/ Resize '/home/jordan/Storage/' of '500g' ERROR: unable to resize '/home/jordan/Storage/' - No space left on device I was wondering if that size doesn't work then what's the minimum I can shrink to? 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 -- 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: What's the minimum size I can shrink my FS to?
Hello, here's the new output: [root@archpc ~]# btrfs bal start -musage=1 -dusage=1 /home/jordan/Storage/ Done, had to relocate 3 out of 609 chunks [root@archpc ~]# btrfs fi df /home/jordan/Storage/ Data: total=580.88GB, used=490.88GB System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=13.01GB, used=1001.83MB [root@archpc ~]# btrfs fi sh failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 606.96GB path /dev/sda6 Btrfs Btrfs v0.19 [root@archpc ~]# btrfs file res 500g /home/jordan/Storage/ Resize '/home/jordan/Storage/' of '500g' ERROR: unable to resize '/home/jordan/Storage/' - No space left on device Thanks. (Had to resend forgot to CC the mailing list, sorry) On Sat, Nov 3, 2012 at 3:09 PM, Jordan Windsor jorda...@gmail.com wrote: Hello, here's the new output: [root@archpc ~]# btrfs bal start -musage=1 -dusage=1 /home/jordan/Storage/ Done, had to relocate 3 out of 609 chunks [root@archpc ~]# btrfs fi df /home/jordan/Storage/ Data: total=580.88GB, used=490.88GB System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=13.01GB, used=1001.83MB [root@archpc ~]# btrfs fi sh failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 606.96GB path /dev/sda6 Btrfs Btrfs v0.19 [root@archpc ~]# btrfs file res 500g /home/jordan/Storage/ Resize '/home/jordan/Storage/' of '500g' ERROR: unable to resize '/home/jordan/Storage/' - No space left on device Thanks. On Sat, Nov 3, 2012 at 2:43 PM, cwillu cwi...@cwillu.com wrote: Run btrfs balance start -musage=1 -dusage=1, and then try it again. This may require update btrfs tools however. On Fri, Nov 2, 2012 at 10:09 PM, Jordan Windsor jorda...@gmail.com wrote: Hello, I'm trying to shrink my Btrfs filesystem to the smallest size it can go, here's the information: failed to read /dev/sr0 Label: 'Storage' uuid: 717d4a43-38b3-495f-841b-d223068584de Total devices 1 FS bytes used 491.86GB devid1 size 612.04GB used 605.98GB path /dev/sda6 Btrfs Btrfs v0.19 Data: total=580.90GB, used=490.88GB System, DUP: total=32.00MB, used=76.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=12.51GB, used=1001.61MB Here's the command I use to resize: [root@archpc ~]# btrfs file res 500g /home/jordan/Storage/ Resize '/home/jordan/Storage/' of '500g' ERROR: unable to resize '/home/jordan/Storage/' - No space left on device I was wondering if that size doesn't work then what's the minimum I can shrink to? 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 -- 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
