Centos 7, Freezing a (root) file system before (xfs) dumping it
I have just installed Centos 7 on my comp. My setup has three partitions root (/), /data and /home. All partitions are of the xfs type.
Now I tried to do the backup of the root partition. In order to do that I executed:
xfsdump -l 0 -f /data/root_fs.xfs /
Everything went well.
Actually I was a bit confused that everything went well because I was dumping live mounted file system. In order to be sure that backup will be good, I decided to freeze the root file system, and then to dump it. To do so I have executed:
Xfs_freeze –f /;xfsdump -l 0 -f /dev/root_fs.xfs /;xfs_freeze –u /
…but now my system hangs. I can ping it, but I don't have access from the keyboard nor from ssh, so I have to do the hard reset.
The same procedure (prior freezing) I can use on let’s say /data or /home partitions with no problem at all.
My questions are:
Will xfsdump with no prior freezing of root file system, ended in partition backup that I will be able to use for bare bone recovery (let’s say on a new disk)?
Why I can freeze /data or /home file systems but not root file system?
Regards.
linux centos
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
asked Feb 23 '17 at 18:37
GlupeGlupe
61
add a comment |
I have just installed Centos 7 on my comp. My setup has three partitions root (/), /data and /home. All partitions are of the xfs type.
Now I tried to do the backup of the root partition. In order to do that I executed:
xfsdump -l 0 -f /data/root_fs.xfs /
Everything went well.
Actually I was a bit confused that everything went well because I was dumping live mounted file system. In order to be sure that backup will be good, I decided to freeze the root file system, and then to dump it. To do so I have executed:
Xfs_freeze –f /;xfsdump -l 0 -f /dev/root_fs.xfs /;xfs_freeze –u /
…but now my system hangs. I can ping it, but I don't have access from the keyboard nor from ssh, so I have to do the hard reset.
The same procedure (prior freezing) I can use on let’s say /data or /home partitions with no problem at all.
My questions are:
Will xfsdump with no prior freezing of root file system, ended in partition backup that I will be able to use for bare bone recovery (let’s say on a new disk)?
Why I can freeze /data or /home file systems but not root file system?
Regards.
linux centos
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
asked Feb 23 '17 at 18:37
GlupeGlupe
61
The manpage says: "Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen". As system processes use to write e.g. log files etc., they are blocked until your dump is done. You should not usexfs_freezefor long lasting operations; from the manpage: "xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots" - as snapshots only need parts of seconds to be created. And if your dump is usable depends on what files are modified during the dump.
– ridgy
Feb 24 '17 at 10:09
add a comment |
I have just installed Centos 7 on my comp. My setup has three partitions root (/), /data and /home. All partitions are of the xfs type.
Now I tried to do the backup of the root partition. In order to do that I executed:
xfsdump -l 0 -f /data/root_fs.xfs /
Everything went well.
Actually I was a bit confused that everything went well because I was dumping live mounted file system. In order to be sure that backup will be good, I decided to freeze the root file system, and then to dump it. To do so I have executed:
Xfs_freeze –f /;xfsdump -l 0 -f /dev/root_fs.xfs /;xfs_freeze –u /
…but now my system hangs. I can ping it, but I don't have access from the keyboard nor from ssh, so I have to do the hard reset.
The same procedure (prior freezing) I can use on let’s say /data or /home partitions with no problem at all.
My questions are:
Will xfsdump with no prior freezing of root file system, ended in partition backup that I will be able to use for bare bone recovery (let’s say on a new disk)?
Why I can freeze /data or /home file systems but not root file system?
Regards.
linux centos
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
asked Feb 23 '17 at 18:37
GlupeGlupe
61
I have just installed Centos 7 on my comp. My setup has three partitions root (/), /data and /home. All partitions are of the xfs type.
Now I tried to do the backup of the root partition. In order to do that I executed:
xfsdump -l 0 -f /data/root_fs.xfs /
Everything went well.
Actually I was a bit confused that everything went well because I was dumping live mounted file system. In order to be sure that backup will be good, I decided to freeze the root file system, and then to dump it. To do so I have executed:
Xfs_freeze –f /;xfsdump -l 0 -f /dev/root_fs.xfs /;xfs_freeze –u /
…but now my system hangs. I can ping it, but I don't have access from the keyboard nor from ssh, so I have to do the hard reset.
The same procedure (prior freezing) I can use on let’s say /data or /home partitions with no problem at all.
My questions are:
Will xfsdump with no prior freezing of root file system, ended in partition backup that I will be able to use for bare bone recovery (let’s say on a new disk)?
Why I can freeze /data or /home file systems but not root file system?
Regards.
linux centos
linux centos
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
asked Feb 23 '17 at 18:37
GlupeGlupe
61
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
asked Feb 23 '17 at 18:37
GlupeGlupe
61
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
edited Feb 23 '17 at 18:57
GAD3R
27.1k1757113
27.1k1757113
asked Feb 23 '17 at 18:37
GlupeGlupe
61
asked Feb 23 '17 at 18:37
GlupeGlupe
61
asked Feb 23 '17 at 18:37
GlupeGlupe
61
61
The manpage says: "Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen". As system processes use to write e.g. log files etc., they are blocked until your dump is done. You should not usexfs_freezefor long lasting operations; from the manpage: "xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots" - as snapshots only need parts of seconds to be created. And if your dump is usable depends on what files are modified during the dump.
– ridgy
Feb 24 '17 at 10:09
add a comment |
The manpage says: "Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen". As system processes use to write e.g. log files etc., they are blocked until your dump is done. You should not usexfs_freezefor long lasting operations; from the manpage: "xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots" - as snapshots only need parts of seconds to be created. And if your dump is usable depends on what files are modified during the dump.
– ridgy
Feb 24 '17 at 10:09
The manpage says: "Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen". As system processes use to write e.g. log files etc., they are blocked until your dump is done. You should not use
xfs_freeze for long lasting operations; from the manpage: "xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots" - as snapshots only need parts of seconds to be created. And if your dump is usable depends on what files are modified during the dump.– ridgy
Feb 24 '17 at 10:09
The manpage says: "Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen". As system processes use to write e.g. log files etc., they are blocked until your dump is done. You should not use
xfs_freeze for long lasting operations; from the manpage: "xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots" - as snapshots only need parts of seconds to be created. And if your dump is usable depends on what files are modified during the dump.– ridgy
Feb 24 '17 at 10:09
add a comment |
1 Answer
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Old question, but in case someone happens to have the same questions:
xfsdumpis indeed designed to be run on live filesystems. Assuming you don't update binaries through the dump process, or move files around, the dump will be consistent and good for recovery. Try to have as quiet filesystem as possible.As the comment to your question says, freezing for long time can create problems. The root filesystem is problematic since (depending on layout) it might include
/varas well, which means logging hangs, updatingutmphangs, etc. so I'm not surprised you can't login anymore.
answered 12 mins ago
iustiniustin
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Old question, but in case someone happens to have the same questions:
xfsdumpis indeed designed to be run on live filesystems. Assuming you don't update binaries through the dump process, or move files around, the dump will be consistent and good for recovery. Try to have as quiet filesystem as possible.As the comment to your question says, freezing for long time can create problems. The root filesystem is problematic since (depending on layout) it might include
/varas well, which means logging hangs, updatingutmphangs, etc. so I'm not surprised you can't login anymore.
answered 12 mins ago
iustiniustin
1
New contributor
iustin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Old question, but in case someone happens to have the same questions:
xfsdumpis indeed designed to be run on live filesystems. Assuming you don't update binaries through the dump process, or move files around, the dump will be consistent and good for recovery. Try to have as quiet filesystem as possible.As the comment to your question says, freezing for long time can create problems. The root filesystem is problematic since (depending on layout) it might include
/varas well, which means logging hangs, updatingutmphangs, etc. so I'm not surprised you can't login anymore.
answered 12 mins ago
iustiniustin
1
New contributor
iustin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Old question, but in case someone happens to have the same questions:
xfsdumpis indeed designed to be run on live filesystems. Assuming you don't update binaries through the dump process, or move files around, the dump will be consistent and good for recovery. Try to have as quiet filesystem as possible.As the comment to your question says, freezing for long time can create problems. The root filesystem is problematic since (depending on layout) it might include
/varas well, which means logging hangs, updatingutmphangs, etc. so I'm not surprised you can't login anymore.
answered 12 mins ago
iustiniustin
1
New contributor
iustin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Old question, but in case someone happens to have the same questions:
xfsdumpis indeed designed to be run on live filesystems. Assuming you don't update binaries through the dump process, or move files around, the dump will be consistent and good for recovery. Try to have as quiet filesystem as possible.As the comment to your question says, freezing for long time can create problems. The root filesystem is problematic since (depending on layout) it might include
/varas well, which means logging hangs, updatingutmphangs, etc. so I'm not surprised you can't login anymore.
answered 12 mins ago
iustiniustin
1
New contributor
iustin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 12 mins ago
iustiniustin
1
New contributor
iustin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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answered 12 mins ago
iustiniustin
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answered 12 mins ago
iustiniustin
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New contributor
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The manpage says: "Any process attempting to write to the frozen filesystem will block waiting for the filesystem to be unfrozen". As system processes use to write e.g. log files etc., they are blocked until your dump is done. You should not use
xfs_freezefor long lasting operations; from the manpage: "xfs_freeze is intended to be used with volume managers and hardware RAID devices that support the creation of snapshots" - as snapshots only need parts of seconds to be created. And if your dump is usable depends on what files are modified during the dump.– ridgy
Feb 24 '17 at 10:09