configuring write-through policy

[xiro-codes]

sorry this is the llm prompt and response, tldr i need to add a line to lvm.conf how to do go about that with disko

>>> could i combine 2x250gb ssd and 2x1tb hdd to use the ssd as a cache for the hdd in linux

Yes, you can combine two 250GB SSDs and two 1TB HDDs to create a storage solution that uses the SSDs
as a cache for the HDDs in Linux. This is known as a "hybrid" storage configuration, where the 
faster SSDs are used as a cache for the slower HDDs.

To set this up in Linux, you can use a tool called LVM (Logical Volume Manager) to create a single 
logical volume that spans both the SSDs and the HDDs. You can then configure LVM to use the SSDs as 
a cache for the HDDs by setting up a "write-through" policy, which writes data to both the SSDs and 
the HDDs simultaneously.

Here's an example of how you might set this up using LVM:

1. First, create a physical volume (PV) for each disk. In this example, we'll use /dev/sda and 
/dev/sdb for the SSDs, and /dev/sdc and /dev/sdd for the HDDs.

sudo pvcreate /dev/sda sudo pvcreate /dev/sdb sudo pvcreate /dev/sdc sudo pvcreate /dev/sdd

2. Next, create a volume group (VG) that spans both the SSD and HDD PVs. In this example, we'll call
it "hybrid-storage".

sudo vgcreate hybrid-storage /dev/sda /dev/sdb /dev/sdc /dev/sdd

3. Now, create a logical volume (LV) that spans the entire VG. In this example, we'll call it 
"root".

sudo lvcreate hybrid-storage -n root

4. Finally, format the LV as ext4 and mount it to /mnt/hybrid-storage.

sudo mkfs.ext4 /dev/mapper/hybrid--storage-root sudo mount /dev/mapper/hybrid--storage-root /mnt/hybrid-storage

5. To configure the write-through policy, you can use the lvm.conf file. Add the following line to 
the "volume_groups" section of the file:

hybrid-storage {

... other configuration options here ...

cache = writethrough

[iFreilicht]

Be more precise.

[xiro-codes]

Simpler info i just want to do the stuff described here https://man.archlinux.org/man/lvmcache.7