correct method to corrupt super block in ext3 filesystem associated with drbd Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionFilesystem with 1Mb block?What filesystem offers best protection for securing data against corruption due to power loss?linux io stack analysisOn system memory… specifically the difference between `tmpfs,` `shm,` and `hugepages…`LVM - failed to install bootloaderextracting the data block pointed to by an inode fails to correspond to the data in the filecreate a device-mapper snapshot of an lvm volume multiple linear device with cow data outside of volume groupMounting a 4tb lvm in Centos 7 keeps saying not enough space on deviceWhat is th difference betwen stat -c %B and stat -c %o?
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correct method to corrupt super block in ext3 filesystem associated with drbd
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionFilesystem with 1Mb block?What filesystem offers best protection for securing data against corruption due to power loss?linux io stack analysisOn system memory… specifically the difference between `tmpfs,` `shm,` and `hugepages…`LVM - failed to install bootloaderextracting the data block pointed to by an inode fails to correspond to the data in the filecreate a device-mapper snapshot of an lvm volume multiple linear device with cow data outside of volume groupMounting a 4tb lvm in Centos 7 keeps saying not enough space on deviceWhat is th difference betwen stat -c %B and stat -c %o?
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I am trying to simulate file system super block corruption.
During this experiment I could not understand the difference between below super block corruption. Please help to know the difference.
A DRBD device drbd1 is created on top of LV (Ex: LV1)
Filesystem is created on top of DRBD device.
VG -> LV -> DRBD -> Ext3 FS
1) dd if=/dev/zero of=/dev/VG1/LV1 count=1 bs=4096
2) dd if=/dev/zero of=/dev/drbd1 count=1 bs=4096
Is there any difference between above two commands?
My understanding is that we should not use 1) command to corrupt the filesystem, if at all FS(filesystem) is created and associated with drbd.
Please help to understand.
linux filesystems lvm ext3 drbd
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
add a comment |
I am trying to simulate file system super block corruption.
During this experiment I could not understand the difference between below super block corruption. Please help to know the difference.
A DRBD device drbd1 is created on top of LV (Ex: LV1)
Filesystem is created on top of DRBD device.
VG -> LV -> DRBD -> Ext3 FS
1) dd if=/dev/zero of=/dev/VG1/LV1 count=1 bs=4096
2) dd if=/dev/zero of=/dev/drbd1 count=1 bs=4096
Is there any difference between above two commands?
My understanding is that we should not use 1) command to corrupt the filesystem, if at all FS(filesystem) is created and associated with drbd.
Please help to understand.
linux filesystems lvm ext3 drbd
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
add a comment |
I am trying to simulate file system super block corruption.
During this experiment I could not understand the difference between below super block corruption. Please help to know the difference.
A DRBD device drbd1 is created on top of LV (Ex: LV1)
Filesystem is created on top of DRBD device.
VG -> LV -> DRBD -> Ext3 FS
1) dd if=/dev/zero of=/dev/VG1/LV1 count=1 bs=4096
2) dd if=/dev/zero of=/dev/drbd1 count=1 bs=4096
Is there any difference between above two commands?
My understanding is that we should not use 1) command to corrupt the filesystem, if at all FS(filesystem) is created and associated with drbd.
Please help to understand.
linux filesystems lvm ext3 drbd
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
I am trying to simulate file system super block corruption.
During this experiment I could not understand the difference between below super block corruption. Please help to know the difference.
A DRBD device drbd1 is created on top of LV (Ex: LV1)
Filesystem is created on top of DRBD device.
VG -> LV -> DRBD -> Ext3 FS
1) dd if=/dev/zero of=/dev/VG1/LV1 count=1 bs=4096
2) dd if=/dev/zero of=/dev/drbd1 count=1 bs=4096
Is there any difference between above two commands?
My understanding is that we should not use 1) command to corrupt the filesystem, if at all FS(filesystem) is created and associated with drbd.
Please help to understand.
linux filesystems lvm ext3 drbd
linux filesystems lvm ext3 drbd
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
asked Nov 4 '16 at 7:18
sandeep nagendrasandeep nagendra
283
283
add a comment |
add a comment |
1 Answer
1
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The difference between the two commands is that one goes through DRBD, and the other goes "behind it's back".
Performing the 'dd' directly to the backing LVM volume will hose the filesystem, but it will not be replicated to the peer as DRBD has no knowledge of these new writes. Additionally, depending upon the size of the disk, this command might also overwrite the DRBD meta-data (stored at the end of the volume). Whereas if running the 'dd' on the /dev/drbd1 device it will exit and report end of disk before touching the DRBD meta-data.
By design DRBD will replicate filesystem corruption and deletion of data.
answered Nov 4 '16 at 16:30
DokDok
32616
add a comment |
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The difference between the two commands is that one goes through DRBD, and the other goes "behind it's back".
Performing the 'dd' directly to the backing LVM volume will hose the filesystem, but it will not be replicated to the peer as DRBD has no knowledge of these new writes. Additionally, depending upon the size of the disk, this command might also overwrite the DRBD meta-data (stored at the end of the volume). Whereas if running the 'dd' on the /dev/drbd1 device it will exit and report end of disk before touching the DRBD meta-data.
By design DRBD will replicate filesystem corruption and deletion of data.
answered Nov 4 '16 at 16:30
DokDok
32616
add a comment |
The difference between the two commands is that one goes through DRBD, and the other goes "behind it's back".
Performing the 'dd' directly to the backing LVM volume will hose the filesystem, but it will not be replicated to the peer as DRBD has no knowledge of these new writes. Additionally, depending upon the size of the disk, this command might also overwrite the DRBD meta-data (stored at the end of the volume). Whereas if running the 'dd' on the /dev/drbd1 device it will exit and report end of disk before touching the DRBD meta-data.
By design DRBD will replicate filesystem corruption and deletion of data.
answered Nov 4 '16 at 16:30
DokDok
32616
add a comment |
The difference between the two commands is that one goes through DRBD, and the other goes "behind it's back".
Performing the 'dd' directly to the backing LVM volume will hose the filesystem, but it will not be replicated to the peer as DRBD has no knowledge of these new writes. Additionally, depending upon the size of the disk, this command might also overwrite the DRBD meta-data (stored at the end of the volume). Whereas if running the 'dd' on the /dev/drbd1 device it will exit and report end of disk before touching the DRBD meta-data.
By design DRBD will replicate filesystem corruption and deletion of data.
answered Nov 4 '16 at 16:30
DokDok
32616
The difference between the two commands is that one goes through DRBD, and the other goes "behind it's back".
Performing the 'dd' directly to the backing LVM volume will hose the filesystem, but it will not be replicated to the peer as DRBD has no knowledge of these new writes. Additionally, depending upon the size of the disk, this command might also overwrite the DRBD meta-data (stored at the end of the volume). Whereas if running the 'dd' on the /dev/drbd1 device it will exit and report end of disk before touching the DRBD meta-data.
By design DRBD will replicate filesystem corruption and deletion of data.
answered Nov 4 '16 at 16:30
DokDok
32616
edited 10 hours ago
answered Nov 4 '16 at 16:30
DokDok
32616
answered Nov 4 '16 at 16:30
DokDok
32616
answered Nov 4 '16 at 16:30
DokDok
32616
32616
add a comment |
add a comment |
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-drbd, ext3, filesystems, linux, lvm
