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System that can read hard-drive and exclusively write into RAM?
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I hope to be at the right place. I could not find any suggestions on the "web" about my question. How could an O.S, let us say a distribution of linux, can be loaded from the hard-drive and execute all the modifications (all the applications) into the RAM ? In other words, how could we use an O.S to read data it needs from a hard-drive and only write what it needs into the RAM.
The aim is to be sure that all the "instructions" (this may be the wrong word) made by the O.S (and all the apps it executes) are made exclusively into the RAM (no write on the hard-disk).
I know some linux distributions can be entirely loaded into the RAM but the inconvenience is the size of the system we get : we can not have much available space for apps in the RAM whereas a normal system will find the needed app from the drive and load it into the memory. This could be done by using an extra RAM for the system but it is not a great solution compared to the use of a hard drive to save the apps we need (because of the actual prices of RAM)
I also thought about a virtual machine which can read the drive to use app and only write into RAM, in most cases. But it requires to load the VM from an existing, and loaded, O.S. so is there a way we can skip the existing O.S part ?
If you have any suggestions or technical words I have to use to search by myself, thank you.
hard-drive memory operating-systems virtual-memory ramdisk
asked 21 hours ago
Ben WBen W
32
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Ben W 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 |
I hope to be at the right place. I could not find any suggestions on the "web" about my question. How could an O.S, let us say a distribution of linux, can be loaded from the hard-drive and execute all the modifications (all the applications) into the RAM ? In other words, how could we use an O.S to read data it needs from a hard-drive and only write what it needs into the RAM.
The aim is to be sure that all the "instructions" (this may be the wrong word) made by the O.S (and all the apps it executes) are made exclusively into the RAM (no write on the hard-disk).
I know some linux distributions can be entirely loaded into the RAM but the inconvenience is the size of the system we get : we can not have much available space for apps in the RAM whereas a normal system will find the needed app from the drive and load it into the memory. This could be done by using an extra RAM for the system but it is not a great solution compared to the use of a hard drive to save the apps we need (because of the actual prices of RAM)
I also thought about a virtual machine which can read the drive to use app and only write into RAM, in most cases. But it requires to load the VM from an existing, and loaded, O.S. so is there a way we can skip the existing O.S part ?
If you have any suggestions or technical words I have to use to search by myself, thank you.
hard-drive memory operating-systems virtual-memory ramdisk
asked 21 hours ago
Ben WBen W
32
New contributor
Ben W 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 |
I hope to be at the right place. I could not find any suggestions on the "web" about my question. How could an O.S, let us say a distribution of linux, can be loaded from the hard-drive and execute all the modifications (all the applications) into the RAM ? In other words, how could we use an O.S to read data it needs from a hard-drive and only write what it needs into the RAM.
The aim is to be sure that all the "instructions" (this may be the wrong word) made by the O.S (and all the apps it executes) are made exclusively into the RAM (no write on the hard-disk).
I know some linux distributions can be entirely loaded into the RAM but the inconvenience is the size of the system we get : we can not have much available space for apps in the RAM whereas a normal system will find the needed app from the drive and load it into the memory. This could be done by using an extra RAM for the system but it is not a great solution compared to the use of a hard drive to save the apps we need (because of the actual prices of RAM)
I also thought about a virtual machine which can read the drive to use app and only write into RAM, in most cases. But it requires to load the VM from an existing, and loaded, O.S. so is there a way we can skip the existing O.S part ?
If you have any suggestions or technical words I have to use to search by myself, thank you.
hard-drive memory operating-systems virtual-memory ramdisk
asked 21 hours ago
Ben WBen W
32
New contributor
Ben W is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I hope to be at the right place. I could not find any suggestions on the "web" about my question. How could an O.S, let us say a distribution of linux, can be loaded from the hard-drive and execute all the modifications (all the applications) into the RAM ? In other words, how could we use an O.S to read data it needs from a hard-drive and only write what it needs into the RAM.
The aim is to be sure that all the "instructions" (this may be the wrong word) made by the O.S (and all the apps it executes) are made exclusively into the RAM (no write on the hard-disk).
I know some linux distributions can be entirely loaded into the RAM but the inconvenience is the size of the system we get : we can not have much available space for apps in the RAM whereas a normal system will find the needed app from the drive and load it into the memory. This could be done by using an extra RAM for the system but it is not a great solution compared to the use of a hard drive to save the apps we need (because of the actual prices of RAM)
I also thought about a virtual machine which can read the drive to use app and only write into RAM, in most cases. But it requires to load the VM from an existing, and loaded, O.S. so is there a way we can skip the existing O.S part ?
If you have any suggestions or technical words I have to use to search by myself, thank you.
hard-drive memory operating-systems virtual-memory ramdisk
hard-drive memory operating-systems virtual-memory ramdisk
asked 21 hours ago
Ben WBen W
32
New contributor
Ben W is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 21 hours ago
Ben WBen W
32
New contributor
Ben W is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 21 hours ago
Ben WBen W
32
New contributor
Ben W is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 21 hours ago
Ben WBen W
32
asked 21 hours ago
Ben WBen W
32
32
New contributor
Ben W is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ben W is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ben W 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 |
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It's possible, but not trivial. I'll give you some pointers, but I can't really provide detailed steps, as I've never tried this myself.
OverlayFS - It lets you create a "layered" filesystem, where lower layer is read-only and upper layer is writable. That being said, lower layer is still completely mutable (you can edit, delete files etc., but they aren't really altered - changes are stored in the upper layer entirely) and works like a full-fledged filesystem.
tmpfs - It's another full-fledged filesystem which resides entirely in memory. You can set a capacity lower than amount of RAM to prevent accidentally choking the OS. Also, unused capacity is available as regular RAM, which is nice.
pivot_root - A system call that moves
/to a different directory.
Typically early in the boot process pivot_root is called to switch from early userspace to on-disk filesystem. You could alter this: create OverlayFS with on-disk filesystem in the lower layer and tmpfs in the upper one, then pivot_root to OverlayFS.
Be warned that upper layer can grow rather quickly, consuming a lot of available RAM. zram can be used to reduce RAM usage at the cost of CPU usage, but it's not an ultimate solution. Updating on-disk OS permanently will also be tricky.
answered 19 hours ago
gronostajgronostaj
29.2k1472108
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
add a comment |
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It's possible, but not trivial. I'll give you some pointers, but I can't really provide detailed steps, as I've never tried this myself.
OverlayFS - It lets you create a "layered" filesystem, where lower layer is read-only and upper layer is writable. That being said, lower layer is still completely mutable (you can edit, delete files etc., but they aren't really altered - changes are stored in the upper layer entirely) and works like a full-fledged filesystem.
tmpfs - It's another full-fledged filesystem which resides entirely in memory. You can set a capacity lower than amount of RAM to prevent accidentally choking the OS. Also, unused capacity is available as regular RAM, which is nice.
pivot_root - A system call that moves
/to a different directory.
Typically early in the boot process pivot_root is called to switch from early userspace to on-disk filesystem. You could alter this: create OverlayFS with on-disk filesystem in the lower layer and tmpfs in the upper one, then pivot_root to OverlayFS.
Be warned that upper layer can grow rather quickly, consuming a lot of available RAM. zram can be used to reduce RAM usage at the cost of CPU usage, but it's not an ultimate solution. Updating on-disk OS permanently will also be tricky.
answered 19 hours ago
gronostajgronostaj
29.2k1472108
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
add a comment |
It's possible, but not trivial. I'll give you some pointers, but I can't really provide detailed steps, as I've never tried this myself.
OverlayFS - It lets you create a "layered" filesystem, where lower layer is read-only and upper layer is writable. That being said, lower layer is still completely mutable (you can edit, delete files etc., but they aren't really altered - changes are stored in the upper layer entirely) and works like a full-fledged filesystem.
tmpfs - It's another full-fledged filesystem which resides entirely in memory. You can set a capacity lower than amount of RAM to prevent accidentally choking the OS. Also, unused capacity is available as regular RAM, which is nice.
pivot_root - A system call that moves
/to a different directory.
Typically early in the boot process pivot_root is called to switch from early userspace to on-disk filesystem. You could alter this: create OverlayFS with on-disk filesystem in the lower layer and tmpfs in the upper one, then pivot_root to OverlayFS.
Be warned that upper layer can grow rather quickly, consuming a lot of available RAM. zram can be used to reduce RAM usage at the cost of CPU usage, but it's not an ultimate solution. Updating on-disk OS permanently will also be tricky.
answered 19 hours ago
gronostajgronostaj
29.2k1472108
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
add a comment |
It's possible, but not trivial. I'll give you some pointers, but I can't really provide detailed steps, as I've never tried this myself.
OverlayFS - It lets you create a "layered" filesystem, where lower layer is read-only and upper layer is writable. That being said, lower layer is still completely mutable (you can edit, delete files etc., but they aren't really altered - changes are stored in the upper layer entirely) and works like a full-fledged filesystem.
tmpfs - It's another full-fledged filesystem which resides entirely in memory. You can set a capacity lower than amount of RAM to prevent accidentally choking the OS. Also, unused capacity is available as regular RAM, which is nice.
pivot_root - A system call that moves
/to a different directory.
Typically early in the boot process pivot_root is called to switch from early userspace to on-disk filesystem. You could alter this: create OverlayFS with on-disk filesystem in the lower layer and tmpfs in the upper one, then pivot_root to OverlayFS.
Be warned that upper layer can grow rather quickly, consuming a lot of available RAM. zram can be used to reduce RAM usage at the cost of CPU usage, but it's not an ultimate solution. Updating on-disk OS permanently will also be tricky.
answered 19 hours ago
gronostajgronostaj
29.2k1472108
It's possible, but not trivial. I'll give you some pointers, but I can't really provide detailed steps, as I've never tried this myself.
OverlayFS - It lets you create a "layered" filesystem, where lower layer is read-only and upper layer is writable. That being said, lower layer is still completely mutable (you can edit, delete files etc., but they aren't really altered - changes are stored in the upper layer entirely) and works like a full-fledged filesystem.
tmpfs - It's another full-fledged filesystem which resides entirely in memory. You can set a capacity lower than amount of RAM to prevent accidentally choking the OS. Also, unused capacity is available as regular RAM, which is nice.
pivot_root - A system call that moves
/to a different directory.
Typically early in the boot process pivot_root is called to switch from early userspace to on-disk filesystem. You could alter this: create OverlayFS with on-disk filesystem in the lower layer and tmpfs in the upper one, then pivot_root to OverlayFS.
Be warned that upper layer can grow rather quickly, consuming a lot of available RAM. zram can be used to reduce RAM usage at the cost of CPU usage, but it's not an ultimate solution. Updating on-disk OS permanently will also be tricky.
answered 19 hours ago
gronostajgronostaj
29.2k1472108
answered 19 hours ago
gronostajgronostaj
29.2k1472108
answered 19 hours ago
gronostajgronostaj
29.2k1472108
answered 19 hours ago
gronostajgronostaj
29.2k1472108
29.2k1472108
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
add a comment |
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
Thank a lot, I'm going to look at it
– Ben W
15 hours ago
add a comment |
Ben W is a new contributor. Be nice, and check out our Code of Conduct.
Ben W is a new contributor. Be nice, and check out our Code of Conduct.
Ben W is a new contributor. Be nice, and check out our Code of Conduct.
Ben W is a new contributor. Be nice, and check out our Code of Conduct.
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