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> ls -lh insgesamt 0 -rw-r--r-- 1 root root 1,0E Mär 11 22:37 evenmorecrazy.img merkaba:/mnt/zeit> truncate -s2E /mnt/zeit/evenmorecrazy.img merkaba:/mnt/zeit> truncate -s3E /mnt/zeit/evenmorecrazy.img merkaba:/mnt/zeit> truncate -s4E /mnt/zeit/evenmorecrazy.img merkaba:/mnt/zeit> truncate -s5E /mnt/zeit/evenmorecrazy.img merkaba:/mnt/zeit> truncate -s6E /mnt/zeit/evenmorecrazy.img 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 16M justinsane /dev/loop0 /dev/loop1 PV /dev/loop0 too large for extent size 16,00 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 128M justinsane /dev/loop0 /dev/loop1 PV /dev/loop0 too large for extent size 128,00 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 1G justinsane /dev/loop0 /dev/loop1 PV /dev/loop0 too large for extent size 1,00 GiB. 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 --- Volume group --- VG Name justinsane System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 1 VG Access read/write VG Status resizable MAX LV 0 Cur LV 0 Open LV 0 Max PV 0 Cur PV 2 Act PV 2 VG Size 14,00 EiB PE Size 4,00 GiB Total PE 3758096382 Alloc PE / Size 0 / 0 Free PE / Size 3758096382 / 14,00 EiB VG UUID z8JP5s-lfRw-uKo8-DXAP-XWGe-aKra-xug9Nn Enough insanity for today :) I won´t mkfs.xfs on it, the 20 GiB of the just filesystem wouldn´t be enough. 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
