On Thu, 10 Dec 2020 20:43:27 +0100
Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> wrote:
>On 12/7/20 3:56 PM, 'heinrich...@googlemail.com' via qubes-users wrote:
>> From one AppVM I need to temporarily access a large amount of files
>> from another AppVM. Can this be done without copying the files around?
>>
>> _Background: _
>> I have a large amount of files stored in AppVM "BIG". That's hundreds of
>> GB in a separate pool on a spinning HDD.
>> I also have a small AppVM "SMALL" running a program that needs to access
>> files from "BIG". This AppVM resides on a small SSD.
>>
>> In the past I copied files from BIG to SMALL. But this takes time and I
>> need to sort the files beforehand because there is not enough space on
>> the SSD. I don't want to do that anymore. It would be okay to allow
>> AppVM "SMALL" to access files from "BIG"'s private storage directly.
>>
>> Googling around tells me to mount "private.img", but I'm using LVM so
>> that's not an option. But how can this be done? Can it be done? (Or is
>> there even a better "file sharing" approach for this amount of data
>> without having to revert to a NAS?)
>>
>> Any tips are appreciated.
>
>Actually I have not done it, but it feels like you should have an NFS
>server on BIG with a network only accessible from inside qubes, and
>specifically from SMALL. Still it will have to transfer the file
>contents, but you benefit from any application that only reads parts of
>the files.
>
>When not wanting to copy I guess you'll have to mount a snapshot of
>BIG's data as the LV should be mounted only once (AFAIK).
>
What I have done is...
created a large disk image (600g or so) on the mail dom0 drive space
written a script in dom0 to attach the image to whichever machine I want to
access it from.
This script..
attaches the image to a loop device
mounts the image to the machine I desire
added /etc/hosts entries to each app vm to mount to a dedicated directory
when doing "sudo mount -a" by uuid
script ends with an execution of "sudo mount -a" on the target vm
there is also a corresponding unmount script, so if it is mounted to "mail" I
can easily unmount it and mount it to "money".
This lets me treat the 600g.img file like a removable media which can be
attached to any app vm. I also back that drive image up on my network server.
Stuart
--
You received this message because you are subscribed to the Google Groups
"qubes-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to qubes-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/qubes-users/20201210222756.6b8c55f6%40usa.net.
