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1

Quick question: is there a filesystem that let me

1. automatically "resize" (up or down) partitions,


2. share one partition between several devices, and


3. make sure that some content only go to one device and not the other?

Context:
I have two drives, a big HDD (1 TB) that I trust, and a very small SSD (24 GB) that I do not trust (i.e. it could be destroyed at any time, but this should not corrupt the data on the HDD). To simplify, let's say I have two folders only:

• /nix will contain the system: I don't mind if I lose this partition, so I'd like to have it as much as possible on the SSD to launch new apps quickly. But '/nix' could contain more that 24 GB of data, so it needs to be partly on the HDD as well.




• /home will contain the data: it contains valuable data that I do not want to put on the SSD to make sure I don't lose them in case of a corruption of the SSD.

For now, I created 3 LVM partitions (physical volumes): two partitions on the HDD (hdda, hddb), and one the SDD (sdda), and I created two LWM group volumes, one that contains hdda + sdda (for the ext4 partition /nix), and one that contains hddb (for the ext4 partition/home). But the problem is that the total size of /nix + /home is always close to the maximum available size, so when I need more memory on /home, I need to shrink down /nix. And shrinking a partition is not super practical, as it requires to boot from a live CD, and takes time...

I saw that the very poverful ZFS (that even allows compression!) can automatically "resize" the partition for me, but unfortunately I can't find how to say "keep the /home partition in HDD, and keep the /nix partition in SDD if possible".

Is there any better filesystem that allows that (compression would be nice as well), or a way to use ZFS in that manner?

Thanks!

filesystems btrfs zfs

share|improve this question

edited 28 mins ago

K7AAY

1,95811029

asked 1 hour ago

tobiasBoratobiasBora

372313

add a comment | 

1

Quick question: is there a filesystem that let me

1. automatically "resize" (up or down) partitions,


2. share one partition between several devices, and


3. make sure that some content only go to one device and not the other?

Context:
I have two drives, a big HDD (1 TB) that I trust, and a very small SSD (24 GB) that I do not trust (i.e. it could be destroyed at any time, but this should not corrupt the data on the HDD). To simplify, let's say I have two folders only:

• /nix will contain the system: I don't mind if I lose this partition, so I'd like to have it as much as possible on the SSD to launch new apps quickly. But '/nix' could contain more that 24 GB of data, so it needs to be partly on the HDD as well.




• /home will contain the data: it contains valuable data that I do not want to put on the SSD to make sure I don't lose them in case of a corruption of the SSD.

For now, I created 3 LVM partitions (physical volumes): two partitions on the HDD (hdda, hddb), and one the SDD (sdda), and I created two LWM group volumes, one that contains hdda + sdda (for the ext4 partition /nix), and one that contains hddb (for the ext4 partition/home). But the problem is that the total size of /nix + /home is always close to the maximum available size, so when I need more memory on /home, I need to shrink down /nix. And shrinking a partition is not super practical, as it requires to boot from a live CD, and takes time...

I saw that the very poverful ZFS (that even allows compression!) can automatically "resize" the partition for me, but unfortunately I can't find how to say "keep the /home partition in HDD, and keep the /nix partition in SDD if possible".

Is there any better filesystem that allows that (compression would be nice as well), or a way to use ZFS in that manner?

Thanks!

filesystems btrfs zfs

share|improve this question

edited 28 mins ago

K7AAY

1,95811029

asked 1 hour ago

tobiasBoratobiasBora

372313

add a comment | 

Quick question: is there a filesystem that let me

1. automatically "resize" (up or down) partitions,


2. share one partition between several devices, and


3. make sure that some content only go to one device and not the other?

Context:
I have two drives, a big HDD (1 TB) that I trust, and a very small SSD (24 GB) that I do not trust (i.e. it could be destroyed at any time, but this should not corrupt the data on the HDD). To simplify, let's say I have two folders only:

• /nix will contain the system: I don't mind if I lose this partition, so I'd like to have it as much as possible on the SSD to launch new apps quickly. But '/nix' could contain more that 24 GB of data, so it needs to be partly on the HDD as well.




• /home will contain the data: it contains valuable data that I do not want to put on the SSD to make sure I don't lose them in case of a corruption of the SSD.

For now, I created 3 LVM partitions (physical volumes): two partitions on the HDD (hdda, hddb), and one the SDD (sdda), and I created two LWM group volumes, one that contains hdda + sdda (for the ext4 partition /nix), and one that contains hddb (for the ext4 partition/home). But the problem is that the total size of /nix + /home is always close to the maximum available size, so when I need more memory on /home, I need to shrink down /nix. And shrinking a partition is not super practical, as it requires to boot from a live CD, and takes time...

I saw that the very poverful ZFS (that even allows compression!) can automatically "resize" the partition for me, but unfortunately I can't find how to say "keep the /home partition in HDD, and keep the /nix partition in SDD if possible".

Is there any better filesystem that allows that (compression would be nice as well), or a way to use ZFS in that manner?

Thanks!

filesystems btrfs zfs

share|improve this question

edited 28 mins ago

K7AAY

1,95811029

asked 1 hour ago

tobiasBoratobiasBora

372313

share|improve this question

edited 28 mins ago

K7AAY

1,95811029

asked 1 hour ago

tobiasBoratobiasBora

372313

share|improve this question

edited 28 mins ago

K7AAY

1,95811029

asked 1 hour ago

tobiasBoratobiasBora

372313

edited 28 mins ago

K7AAY

1,95811029

edited 28 mins ago

K7AAY

1,95811029

asked 1 hour ago

tobiasBoratobiasBora

372313

asked 1 hour ago

tobiasBoratobiasBora

372313