Am Montag, 11. März 2013 schrieb Martin Steigerwald: > Am Montag, 11. März 2013 schrieb Martin Steigerwald: > > 2) Create a insanely big sparse file > > > > merkaba:~> truncate -s1E /mnt/zeit/evenmorecrazy.img > > merkaba:~> ls -lh /mnt/zeit/evenmorecrazy.img > > -rw-r--r-- 1 root root 1,0E Mär 11 22:37 /mnt/zeit/evenmorecrazy.img > > > > (No, this won´t work with Ext4.) > > Okay, you can´t go beyond 8 EiB for a single file which is about what I > have read somewhere: […] > merkaba:/mnt/zeit> truncate -s7E /mnt/zeit/evenmorecrazy.img > merkaba:/mnt/zeit> LANG=C truncate -s8E /mnt/zeit/evenmorecrazy.img > truncate: invalid number '8E': Value too large for defined data type > merkaba:/mnt/zeit#1> ls -lh > insgesamt 0 > -rw-r--r-- 1 root root 7,0E Mär 11 22:49 evenmorecrazy.img > > So so tests stops there, until you concatenate two of those files with > LVM or SoftRAID 0 (if that works). Like this (I just had to try it): > > > merkaba:/mnt/zeit> ls -lh > insgesamt 0 > -rw-r--r-- 1 root root 7,0E Mär 11 22:49 evenmorecrazy.img > -rw-r--r-- 1 root root 7,0E Mär 11 22:52 evenmorecrazy.img2 > merkaba:/mnt/zeit> losetup /dev/loop0 evenmorecrazy.img > merkaba:/mnt/zeit> losetup /dev/loop1 evenmorecrazy.img2 > > merkaba:/mnt/zeit#5> pvcreate /dev/loop0 > Physical volume "/dev/loop0" successfully created > merkaba:/mnt/zeit> pvcreate /dev/loop1 > Physical volume "/dev/loop1" successfully created > merkaba:/mnt/zeit> vgcreate justinsane /dev/loop0 /dev/loop1 > PV /dev/loop0 too large for extent size 4,00 MiB. > Format-specific setup of physical volume '/dev/loop0' failed. > Unable to add physical volume '/dev/loop0' to volume group > 'justinsane'. […] > merkaba:/mnt/zeit#5> vgcreate --physicalextentsize 4G justinsane > /dev/loop0 /dev/loop1 > Volume group "justinsane" successfully created > > merkaba:/mnt/zeit> vgs > VG #PV #LV #SN Attr VSize VFree > justinsane 2 0 0 wz--n- 14,00e 14,00e > merkaba 1 4 0 wz--n- 278,99g 4,85g > merkaba:/mnt/zeit> > > merkaba:/mnt/zeit> vgdisplay justinsane […] > Enough insanity for today :) Not quite: > I won´t mkfs.xfs on it, the 20 GiB of the just filesystem wouldn´t be > enough. Ok, there seems to be another limit involved: merkaba:/mnt/zeit> lvcreate -n yourbiggiexfs -L14E justinsane Volume group "justinsane" has insufficient free space (3758096382 extents): 3758096384 required. merkaba:/mnt/zeit#5> LANG=C lvcreate -n yourbiggiexfs -L14E justinsane Volume group "justinsane" has insufficient free space (3758096382 extents): 3758096384 required. merkaba:/mnt/zeit#5> LANG=C lvcreate -n yourbiggiexfs -L13E justinsane /dev/justinsane/yourbiggiexfs: lseek 0 failed: Invalid argument /dev/justinsane/yourbiggiexfs: lseek 0 failed: Invalid argument Logical volume "yourbiggiexfs" created merkaba:/mnt/zeit> LANG=C lvs /dev/justinsane/yourbiggiexfs: lseek 14987979559888945152 failed: Invalid argument /dev/justinsane/yourbiggiexfs: lseek 14987979559889002496 failed: Invalid argument /dev/justinsane/yourbiggiexfs: lseek 0 failed: Invalid argument /dev/justinsane/yourbiggiexfs: lseek 4096 failed: Invalid argument /dev/justinsane/yourbiggiexfs: lseek 0 failed: Invalid argument LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert yourbiggiexfs justinsane -wi-a---- 13.00e So testing with 9 EiB might become some issue :) Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
