ZFS Properties of multiple filesystems question

M

mefizto

Greetings all,

I have some questions that occurred to me only recently and I cannot find an answer, perhaps by using wrong query.

Let us say that there is a pool storage mounted on /storage; the filesystem /storage having default properties. Additionally other filesystems, e.g., /storage/movies, /storage/mail, etc., are created.

It would be desirable to have different properties for the different filesystems, e.g., recordsize=1M, ashift=off for the /storage/movies, but default recordsize and ashift=on for the /storage/mail.

Do I understand it correctly that the settings on the different filesystems are independent? That is, the unused space on the filesystem /storage will retain default properties, and the /storage/movies, /storage/mail will have the properties set forth therein.

The other question is whether there is a practical difference where the filesystems are mounted. E.g., whether the storage/mail is mounted on /storage/mail or /mail?

Kindest regards,

M
 
mefizto said:
Do I understand it correctly that the settings on the different filesystems are independent? That is, the unused space on the filesystem /storage will retain default properties, and the /storage/movies, /storage/mail will have the properties set forth therein.
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That's the point! The available storage space is shared by all, but the properties are valid per filesystem (and below, via inheritance). (The unused space does not have any properties - properties define how files are stored into the dataset)

mefizto said:
The other question is whether there is a practical difference where the filesystems are mounted. E.g., whether the storage/mail is mounted on /storage/mail or /mail?
Click to expand...
Mounting storage/mail into /storage/mail is the default, ZFS does this without further configuration. But you can mount it anywhere else, either by setting the mountpoint property, or by mounting via mount -t zfs ... .
 
Hi PMc,

thank you for the reply; very helpful confirming my understanding.

Regarding the mount, I understand that I can mount it anywhere, I was just wondering if there is a practical difference.

Kindest regards,

M
 
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