How do I resize a logical volume to the size of the filesystem within it?How can I resize a regular (non-LVM) partition?LVM: resize2fs not resizingResizing lvm2 logical volume and file system: Exact sizes?Any way to recover ext4 filesystems from a deleted LVM logical volume?Can't mount home after trying to resize (bad geometry: block count exceeds size of device).Unexpected behaviour from dfHow to enlarge the root partition on Centos 7 / ibdata1 getting too largeExtending a logical volume , stealing from othersExtend lvm logical volumeLogical Volume /dev/centos/root is extended but /dev/mapper/centos-root is not
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How do I resize a logical volume to the size of the filesystem within it?
How can I resize a regular (non-LVM) partition?LVM: resize2fs not resizingResizing lvm2 logical volume and file system: Exact sizes?Any way to recover ext4 filesystems from a deleted LVM logical volume?Can't mount home after trying to resize (bad geometry: block count exceeds size of device).Unexpected behaviour from dfHow to enlarge the root partition on Centos 7 / ibdata1 getting too largeExtending a logical volume , stealing from othersExtend lvm logical volumeLogical Volume /dev/centos/root is extended but /dev/mapper/centos-root is not
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;
Target system is CentOS 6.x but resizing operations will be done in %pre section of CentOS 7.6 kickstart.
I have already run resize2fs -M /dev/mapper/centos-home successfully.
If I mount the volume, df says it's 100% full. This is good.
Now I need to reduce the size of the logical volume to match the size of the ext4 filesystem. I don't want to use rough estimates. I also don't need to conserve every possible extent. Within a >= 1GB range is fine. i.e. volume can be reduced to 1GB >= filesystem size.
The target volume does contain data I can't lose. I don't have shell (or any other) access to the system. The system has no CentOS repos available so I cannot upgrade it. I don't even have remote hands I can talk to. I'm using a different computer to build and test my install ISO on.
My %pre syntax/script needs to safely reduce /dev/mapper/centos-home so I can create a new root volume for CentOS 7.6 install. Yes, this entire proposition is nuts.
centos7 centos6 lvm kickstart
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
add a comment |
Target system is CentOS 6.x but resizing operations will be done in %pre section of CentOS 7.6 kickstart.
I have already run resize2fs -M /dev/mapper/centos-home successfully.
If I mount the volume, df says it's 100% full. This is good.
Now I need to reduce the size of the logical volume to match the size of the ext4 filesystem. I don't want to use rough estimates. I also don't need to conserve every possible extent. Within a >= 1GB range is fine. i.e. volume can be reduced to 1GB >= filesystem size.
The target volume does contain data I can't lose. I don't have shell (or any other) access to the system. The system has no CentOS repos available so I cannot upgrade it. I don't even have remote hands I can talk to. I'm using a different computer to build and test my install ISO on.
My %pre syntax/script needs to safely reduce /dev/mapper/centos-home so I can create a new root volume for CentOS 7.6 install. Yes, this entire proposition is nuts.
centos7 centos6 lvm kickstart
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
usedGB=$(df -h $homevol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)') ; echo $usedGBprints '5' How do I use pass my variable $usedGB to lvreduce ?
– mr.zog
Apr 26 at 17:29
lvreduce -L -$usedGBG /dev/mapper/centos-homeWARNING: Reducing active logical volume to 15.00 GiB. . . . but echo $usedGB reports only 5GB . . .
– mr.zog
Apr 26 at 17:39
OK. I needed$usedGBGnot-$usedGBGHad to remove the hyphen.
– mr.zog
Apr 26 at 17:42
add a comment |
Target system is CentOS 6.x but resizing operations will be done in %pre section of CentOS 7.6 kickstart.
I have already run resize2fs -M /dev/mapper/centos-home successfully.
If I mount the volume, df says it's 100% full. This is good.
Now I need to reduce the size of the logical volume to match the size of the ext4 filesystem. I don't want to use rough estimates. I also don't need to conserve every possible extent. Within a >= 1GB range is fine. i.e. volume can be reduced to 1GB >= filesystem size.
The target volume does contain data I can't lose. I don't have shell (or any other) access to the system. The system has no CentOS repos available so I cannot upgrade it. I don't even have remote hands I can talk to. I'm using a different computer to build and test my install ISO on.
My %pre syntax/script needs to safely reduce /dev/mapper/centos-home so I can create a new root volume for CentOS 7.6 install. Yes, this entire proposition is nuts.
centos7 centos6 lvm kickstart
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
Target system is CentOS 6.x but resizing operations will be done in %pre section of CentOS 7.6 kickstart.
I have already run resize2fs -M /dev/mapper/centos-home successfully.
If I mount the volume, df says it's 100% full. This is good.
Now I need to reduce the size of the logical volume to match the size of the ext4 filesystem. I don't want to use rough estimates. I also don't need to conserve every possible extent. Within a >= 1GB range is fine. i.e. volume can be reduced to 1GB >= filesystem size.
The target volume does contain data I can't lose. I don't have shell (or any other) access to the system. The system has no CentOS repos available so I cannot upgrade it. I don't even have remote hands I can talk to. I'm using a different computer to build and test my install ISO on.
My %pre syntax/script needs to safely reduce /dev/mapper/centos-home so I can create a new root volume for CentOS 7.6 install. Yes, this entire proposition is nuts.
centos7 centos6 lvm kickstart
centos7 centos6 lvm kickstart
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
asked Apr 26 at 17:17
mr.zogmr.zog
43711024
43711024
usedGB=$(df -h $homevol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)') ; echo $usedGBprints '5' How do I use pass my variable $usedGB to lvreduce ?
– mr.zog
Apr 26 at 17:29
lvreduce -L -$usedGBG /dev/mapper/centos-homeWARNING: Reducing active logical volume to 15.00 GiB. . . . but echo $usedGB reports only 5GB . . .
– mr.zog
Apr 26 at 17:39
OK. I needed$usedGBGnot-$usedGBGHad to remove the hyphen.
– mr.zog
Apr 26 at 17:42
add a comment |
usedGB=$(df -h $homevol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)') ; echo $usedGBprints '5' How do I use pass my variable $usedGB to lvreduce ?
– mr.zog
Apr 26 at 17:29
lvreduce -L -$usedGBG /dev/mapper/centos-homeWARNING: Reducing active logical volume to 15.00 GiB. . . . but echo $usedGB reports only 5GB . . .
– mr.zog
Apr 26 at 17:39
OK. I needed$usedGBGnot-$usedGBGHad to remove the hyphen.
– mr.zog
Apr 26 at 17:42
usedGB=$(df -h $homevol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)') ; echo $usedGB prints '5' How do I use pass my variable $usedGB to lvreduce ?– mr.zog
Apr 26 at 17:29
usedGB=$(df -h $homevol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)') ; echo $usedGB prints '5' How do I use pass my variable $usedGB to lvreduce ?– mr.zog
Apr 26 at 17:29
lvreduce -L -$usedGBG /dev/mapper/centos-home WARNING: Reducing active logical volume to 15.00 GiB. . . . but echo $usedGB reports only 5GB . . .– mr.zog
Apr 26 at 17:39
lvreduce -L -$usedGBG /dev/mapper/centos-home WARNING: Reducing active logical volume to 15.00 GiB. . . . but echo $usedGB reports only 5GB . . .– mr.zog
Apr 26 at 17:39
OK. I needed
$usedGBG not -$usedGBG Had to remove the hyphen.– mr.zog
Apr 26 at 17:42
OK. I needed
$usedGBG not -$usedGBG Had to remove the hyphen.– mr.zog
Apr 26 at 17:42
add a comment |
2 Answers
2
active
oldest
votes
Do it in one step.
/sbin/lvresize --resizefs --size -8g /dev/mapper/centos-home
Where 8g is the size of the root volume you want to install.
Constant size may be acceptable because the size of your new install is predictable.
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-rootThis is the cleanest way.
– mr.zog
Apr 26 at 19:15
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
add a comment |
It's not really a script per se.
rootvol=/dev/mapper/vg_stt-lv_root
mkdir /tmp/rootlv
mount -t ext4 -o ro $rootvol /tmp/rootlv
usedROOT=$(df -h $rootvol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)')
umount /tmp/rootvol
/sbin/lvresize --resizefs --size $usedROOTg $rootvol
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Do it in one step.
/sbin/lvresize --resizefs --size -8g /dev/mapper/centos-home
Where 8g is the size of the root volume you want to install.
Constant size may be acceptable because the size of your new install is predictable.
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-rootThis is the cleanest way.
– mr.zog
Apr 26 at 19:15
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
add a comment |
Do it in one step.
/sbin/lvresize --resizefs --size -8g /dev/mapper/centos-home
Where 8g is the size of the root volume you want to install.
Constant size may be acceptable because the size of your new install is predictable.
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-rootThis is the cleanest way.
– mr.zog
Apr 26 at 19:15
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
add a comment |
Do it in one step.
/sbin/lvresize --resizefs --size -8g /dev/mapper/centos-home
Where 8g is the size of the root volume you want to install.
Constant size may be acceptable because the size of your new install is predictable.
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
Do it in one step.
/sbin/lvresize --resizefs --size -8g /dev/mapper/centos-home
Where 8g is the size of the root volume you want to install.
Constant size may be acceptable because the size of your new install is predictable.
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
answered Apr 26 at 17:43
John MahowaldJohn Mahowald
9,5291713
9,5291713
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-rootThis is the cleanest way.
– mr.zog
Apr 26 at 19:15
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
add a comment |
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-rootThis is the cleanest way.
– mr.zog
Apr 26 at 19:15
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-root This is the cleanest way.– mr.zog
Apr 26 at 19:15
/sbin/lvresize --resizefs --size -$usedGBg /dev/mapper/centos-root This is the cleanest way.– mr.zog
Apr 26 at 19:15
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
If you have a script to calculate the maximum reduction, answer your own question with it. I find the constant reduction safer because if it cannot reduce by enough it aborts.
– John Mahowald
Apr 27 at 12:03
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
I don't understand what you mean by "constant reduction."
– mr.zog
Apr 27 at 20:22
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
By constant reduction I mean hard coded reducing by 8g to simplify things. Consistent sizing of the volume, and if it fails there won't be enough space for the new volume. Your script to detect how much to reduce is a different approach.
– John Mahowald
Apr 27 at 20:26
add a comment |
It's not really a script per se.
rootvol=/dev/mapper/vg_stt-lv_root
mkdir /tmp/rootlv
mount -t ext4 -o ro $rootvol /tmp/rootlv
usedROOT=$(df -h $rootvol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)')
umount /tmp/rootvol
/sbin/lvresize --resizefs --size $usedROOTg $rootvol
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
add a comment |
It's not really a script per se.
rootvol=/dev/mapper/vg_stt-lv_root
mkdir /tmp/rootlv
mount -t ext4 -o ro $rootvol /tmp/rootlv
usedROOT=$(df -h $rootvol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)')
umount /tmp/rootvol
/sbin/lvresize --resizefs --size $usedROOTg $rootvol
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
add a comment |
It's not really a script per se.
rootvol=/dev/mapper/vg_stt-lv_root
mkdir /tmp/rootlv
mount -t ext4 -o ro $rootvol /tmp/rootlv
usedROOT=$(df -h $rootvol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)')
umount /tmp/rootvol
/sbin/lvresize --resizefs --size $usedROOTg $rootvol
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
It's not really a script per se.
rootvol=/dev/mapper/vg_stt-lv_root
mkdir /tmp/rootlv
mount -t ext4 -o ro $rootvol /tmp/rootlv
usedROOT=$(df -h $rootvol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)')
umount /tmp/rootvol
/sbin/lvresize --resizefs --size $usedROOTg $rootvol
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
answered Apr 27 at 19:55
mr.zogmr.zog
43711024
43711024
add a comment |
add a comment |
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usedGB=$(df -h $homevol | tail -1 | awk 'print $2' | awk 'printf("%dn",$1 + 1)') ; echo $usedGBprints '5' How do I use pass my variable $usedGB to lvreduce ?– mr.zog
Apr 26 at 17:29
lvreduce -L -$usedGBG /dev/mapper/centos-homeWARNING: Reducing active logical volume to 15.00 GiB. . . . but echo $usedGB reports only 5GB . . .– mr.zog
Apr 26 at 17:39
OK. I needed
$usedGBGnot-$usedGBGHad to remove the hyphen.– mr.zog
Apr 26 at 17:42