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Why a file as swap can't be used for hibernation in Linux?
The 2019 Stack Overflow Developer Survey Results Are InWhy does Linux use a swap partition rather than a file?Can't resume from Suspend / HibernateWhy does resume from hibernation pause/hang?Swap separation for multiple distributionsExtending swap on Centosdebian 8 shutdown dialog change hibernate button methodhow does systemd activate encrypted swap file on alternate partition?Hibernation of a dual boot machine with a shared writable partitionWhy simultaneous use of multiple swap space rather than sequentially, in accordance with the priority?Attributes of Swap PartitionDual-boot Linux & hiberantion: share swap partitionHibernation not working on Linux Mint 19
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I was trying to hibernate my Fedora 27 system temporarily using a swap file and failed. Answers in the following question also says that a dedicated swap partition must be used to hibernate the system and swapfile can't server the purpose.
Why does Linux use a swap partition rather than a file?
I'm using ext3 file system in which I created the swapfile. What is stopping the swapfile to be used for hibernation?
linux swap hibernate
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
add a comment |
I was trying to hibernate my Fedora 27 system temporarily using a swap file and failed. Answers in the following question also says that a dedicated swap partition must be used to hibernate the system and swapfile can't server the purpose.
Why does Linux use a swap partition rather than a file?
I'm using ext3 file system in which I created the swapfile. What is stopping the swapfile to be used for hibernation?
linux swap hibernate
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
3
kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt
– don_crissti
Mar 28 '18 at 22:39
add a comment |
I was trying to hibernate my Fedora 27 system temporarily using a swap file and failed. Answers in the following question also says that a dedicated swap partition must be used to hibernate the system and swapfile can't server the purpose.
Why does Linux use a swap partition rather than a file?
I'm using ext3 file system in which I created the swapfile. What is stopping the swapfile to be used for hibernation?
linux swap hibernate
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
I was trying to hibernate my Fedora 27 system temporarily using a swap file and failed. Answers in the following question also says that a dedicated swap partition must be used to hibernate the system and swapfile can't server the purpose.
Why does Linux use a swap partition rather than a file?
I'm using ext3 file system in which I created the swapfile. What is stopping the swapfile to be used for hibernation?
linux swap hibernate
linux swap hibernate
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
asked Mar 28 '18 at 21:37
Abhik BoseAbhik Bose
1,5811424
1,5811424
3
kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt
– don_crissti
Mar 28 '18 at 22:39
add a comment |
3
kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt
– don_crissti
Mar 28 '18 at 22:39
3
3
kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt
– don_crissti
Mar 28 '18 at 22:39
kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt
– don_crissti
Mar 28 '18 at 22:39
add a comment |
2 Answers
2
active
oldest
votes
As said here (link provided by @don_crissti), the system must locate the swap file's header, but in order to do this the filesystem that contains the swap file must be mounted, and a journaled filesystem (as ext3 is) cannot be mounted during resume from disk.
Quoting from the document:
In order to use a swap file with swsusp, you need to:
1) Create the swap file and make it active, eg.
# dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k>
# mkswap <swap_file_path>
# swapon <swap_file_path>
2) Use an application that will bmap the swap file with the help of the
FIBMAP ioctl and determine the location of the file's swap header, as the
offset, in<PAGE_SIZE>units, from the beginning of the partition which
holds the swap file.
3) Add the following parameters to the kernel command line:
resume=<swap_file_partition> resume_offset=<swap_file_offset>
where
<swap_file_partition>is the partition on which the swap file is located
and<swap_file_offset>is the offset of the swap header determined by the
application in 2) (of course, this step may be carried out automatically
by the same application that determines the swap file's header offset using the
FIBMAP ioctl)
OR
Use a userland suspend application that will set the partition and offset
with the help of the SNAPSHOT_SET_SWAP_AREA ioctl described in
Documentation/power/userland-swsusp.txt (this is the only method to suspend
to a swap file allowing the resume to be initiated from an initrd or initramfs
image).
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
add a comment |
You can do this, I've written a big documentation in this SO reply, globally it is working by using uswsusp and configuring initramfs & Grub correctly.
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
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votes
As said here (link provided by @don_crissti), the system must locate the swap file's header, but in order to do this the filesystem that contains the swap file must be mounted, and a journaled filesystem (as ext3 is) cannot be mounted during resume from disk.
Quoting from the document:
In order to use a swap file with swsusp, you need to:
1) Create the swap file and make it active, eg.
# dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k>
# mkswap <swap_file_path>
# swapon <swap_file_path>
2) Use an application that will bmap the swap file with the help of the
FIBMAP ioctl and determine the location of the file's swap header, as the
offset, in<PAGE_SIZE>units, from the beginning of the partition which
holds the swap file.
3) Add the following parameters to the kernel command line:
resume=<swap_file_partition> resume_offset=<swap_file_offset>
where
<swap_file_partition>is the partition on which the swap file is located
and<swap_file_offset>is the offset of the swap header determined by the
application in 2) (of course, this step may be carried out automatically
by the same application that determines the swap file's header offset using the
FIBMAP ioctl)
OR
Use a userland suspend application that will set the partition and offset
with the help of the SNAPSHOT_SET_SWAP_AREA ioctl described in
Documentation/power/userland-swsusp.txt (this is the only method to suspend
to a swap file allowing the resume to be initiated from an initrd or initramfs
image).
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
add a comment |
As said here (link provided by @don_crissti), the system must locate the swap file's header, but in order to do this the filesystem that contains the swap file must be mounted, and a journaled filesystem (as ext3 is) cannot be mounted during resume from disk.
Quoting from the document:
In order to use a swap file with swsusp, you need to:
1) Create the swap file and make it active, eg.
# dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k>
# mkswap <swap_file_path>
# swapon <swap_file_path>
2) Use an application that will bmap the swap file with the help of the
FIBMAP ioctl and determine the location of the file's swap header, as the
offset, in<PAGE_SIZE>units, from the beginning of the partition which
holds the swap file.
3) Add the following parameters to the kernel command line:
resume=<swap_file_partition> resume_offset=<swap_file_offset>
where
<swap_file_partition>is the partition on which the swap file is located
and<swap_file_offset>is the offset of the swap header determined by the
application in 2) (of course, this step may be carried out automatically
by the same application that determines the swap file's header offset using the
FIBMAP ioctl)
OR
Use a userland suspend application that will set the partition and offset
with the help of the SNAPSHOT_SET_SWAP_AREA ioctl described in
Documentation/power/userland-swsusp.txt (this is the only method to suspend
to a swap file allowing the resume to be initiated from an initrd or initramfs
image).
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
add a comment |
As said here (link provided by @don_crissti), the system must locate the swap file's header, but in order to do this the filesystem that contains the swap file must be mounted, and a journaled filesystem (as ext3 is) cannot be mounted during resume from disk.
Quoting from the document:
In order to use a swap file with swsusp, you need to:
1) Create the swap file and make it active, eg.
# dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k>
# mkswap <swap_file_path>
# swapon <swap_file_path>
2) Use an application that will bmap the swap file with the help of the
FIBMAP ioctl and determine the location of the file's swap header, as the
offset, in<PAGE_SIZE>units, from the beginning of the partition which
holds the swap file.
3) Add the following parameters to the kernel command line:
resume=<swap_file_partition> resume_offset=<swap_file_offset>
where
<swap_file_partition>is the partition on which the swap file is located
and<swap_file_offset>is the offset of the swap header determined by the
application in 2) (of course, this step may be carried out automatically
by the same application that determines the swap file's header offset using the
FIBMAP ioctl)
OR
Use a userland suspend application that will set the partition and offset
with the help of the SNAPSHOT_SET_SWAP_AREA ioctl described in
Documentation/power/userland-swsusp.txt (this is the only method to suspend
to a swap file allowing the resume to be initiated from an initrd or initramfs
image).
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
As said here (link provided by @don_crissti), the system must locate the swap file's header, but in order to do this the filesystem that contains the swap file must be mounted, and a journaled filesystem (as ext3 is) cannot be mounted during resume from disk.
Quoting from the document:
In order to use a swap file with swsusp, you need to:
1) Create the swap file and make it active, eg.
# dd if=/dev/zero of=<swap_file_path> bs=1024 count=<swap_file_size_in_k>
# mkswap <swap_file_path>
# swapon <swap_file_path>
2) Use an application that will bmap the swap file with the help of the
FIBMAP ioctl and determine the location of the file's swap header, as the
offset, in<PAGE_SIZE>units, from the beginning of the partition which
holds the swap file.
3) Add the following parameters to the kernel command line:
resume=<swap_file_partition> resume_offset=<swap_file_offset>
where
<swap_file_partition>is the partition on which the swap file is located
and<swap_file_offset>is the offset of the swap header determined by the
application in 2) (of course, this step may be carried out automatically
by the same application that determines the swap file's header offset using the
FIBMAP ioctl)
OR
Use a userland suspend application that will set the partition and offset
with the help of the SNAPSHOT_SET_SWAP_AREA ioctl described in
Documentation/power/userland-swsusp.txt (this is the only method to suspend
to a swap file allowing the resume to be initiated from an initrd or initramfs
image).
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
answered Mar 29 '18 at 10:43
dr01dr01
16.3k115475
16.3k115475
add a comment |
add a comment |
You can do this, I've written a big documentation in this SO reply, globally it is working by using uswsusp and configuring initramfs & Grub correctly.
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
add a comment |
You can do this, I've written a big documentation in this SO reply, globally it is working by using uswsusp and configuring initramfs & Grub correctly.
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
add a comment |
You can do this, I've written a big documentation in this SO reply, globally it is working by using uswsusp and configuring initramfs & Grub correctly.
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
You can do this, I've written a big documentation in this SO reply, globally it is working by using uswsusp and configuring initramfs & Grub correctly.
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
answered Apr 8 at 13:50
Anthony O.Anthony O.
34538
34538
add a comment |
add a comment |
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3
kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt
– don_crissti
Mar 28 '18 at 22:39