AndrewBartko
Cadet
- Joined
- Jan 9, 2020
- Messages
- 1
First all, I am extremely new to FreeNAS and I am learning this system in a live environment as I go along. I have read up on some of the basics, but I am running into an issue that I can't quite understand.
Here is a bit of information about our environment:
Version:
FreeNAS-11.2-U5
Physical Memory:
8124 MiB
Model:
Intel(R) Core(TM) i3-3240 CPU @ 3.40GHz
Currently, our SAN has 37 disks attached. 35 of these are meant for creating our storage pool. We are bundling these disks together 5 at a time and configuring them into a RaidZ1 setup. We should end up with 7 vdevs to make up our ZFS pool. We would like to start off with only 2 vdevs to start. The Pool is then going to to be used to store a zvol which will be attached to our server via iSCSI.
I wanted to take the setup one step at a time to make sure I understood how we would extend our pool/zvol in the future. To replicate this, I created a new pool with just one of the vdevs (5 - 6TB disks with RaidZ1). Everything looked good to start. Our pool was created and saw that we had a dataset with 21.09 TiB available. I then proceeded in creating the zvol, keeping in mind to only utilize 80% of the total size. (21.09 * 0.8 = 16.87 TiB).
I created the zvol and set the size to be 16.87 with no issues. Our dataset showed 16.94 TiB Used and 4.15 TiB available (this seems like 80% of the pool that will be available to us for storage, and the 20% that is recommended to keep available). When looking at the vzol, I see that we had a volume with 16.94 TiB Used and 21.09 TiB available. Everything looked great, until the next step.
Next, I extended the pool, adding in another vdev (5 - 6TB disks with RaidZ1). This is when things got a bit confusing... Our dataset then showed the same 16.94 TiB Used, but now 25.24 TiB available. If I try and increase the size of the zvol, we recieve a warning: "It is not recommended to use more than 80% of your available space for VOLUME ".
According to my calculations, I should have been able to increase the zvol by another 16.87 TiB which would make the zvol total size at around 33.74 TiB. I couldn't even increase the zvol from 16.87 TiB to 17 TiB without receiving the warning about not exceeding 80% (same error listed above).
I am guessing there is something that needs done with the dataset since it shows 25.24 TiB available after the pool was extended? I cant quite figure out the next step I need to perform in order to get the second vdev incorporated into our pool so it can be used to increase the size of our zvol.
I have tried to troubleshoot this issue by deleting the pool and recreating it. This time, I added the first vdev (5 - 6TB disks with RaidZ1). I then extended the pool by creating the second vdev (5 - 6TB disks with RaidZ1). After this, I saw that I had the desired 42.18 TiB available in our dataset, which if I tool 80% of that and turned it into a zvol (42.18 * 0.8 = 33.74 TiB). I can successfully create our desired 33.74 TiB zvol if I extend the pool before creating the zvol. This is a workaround for the time being, but in the future when we add additional storage to this pool, I would like to know how to get around this issue.
Any help would be greatly appreciated!
Here is a bit of information about our environment:
Version:
FreeNAS-11.2-U5
Physical Memory:
8124 MiB
Model:
Intel(R) Core(TM) i3-3240 CPU @ 3.40GHz
Currently, our SAN has 37 disks attached. 35 of these are meant for creating our storage pool. We are bundling these disks together 5 at a time and configuring them into a RaidZ1 setup. We should end up with 7 vdevs to make up our ZFS pool. We would like to start off with only 2 vdevs to start. The Pool is then going to to be used to store a zvol which will be attached to our server via iSCSI.
I wanted to take the setup one step at a time to make sure I understood how we would extend our pool/zvol in the future. To replicate this, I created a new pool with just one of the vdevs (5 - 6TB disks with RaidZ1). Everything looked good to start. Our pool was created and saw that we had a dataset with 21.09 TiB available. I then proceeded in creating the zvol, keeping in mind to only utilize 80% of the total size. (21.09 * 0.8 = 16.87 TiB).
I created the zvol and set the size to be 16.87 with no issues. Our dataset showed 16.94 TiB Used and 4.15 TiB available (this seems like 80% of the pool that will be available to us for storage, and the 20% that is recommended to keep available). When looking at the vzol, I see that we had a volume with 16.94 TiB Used and 21.09 TiB available. Everything looked great, until the next step.
Next, I extended the pool, adding in another vdev (5 - 6TB disks with RaidZ1). This is when things got a bit confusing... Our dataset then showed the same 16.94 TiB Used, but now 25.24 TiB available. If I try and increase the size of the zvol, we recieve a warning: "It is not recommended to use more than 80% of your available space for VOLUME ".
According to my calculations, I should have been able to increase the zvol by another 16.87 TiB which would make the zvol total size at around 33.74 TiB. I couldn't even increase the zvol from 16.87 TiB to 17 TiB without receiving the warning about not exceeding 80% (same error listed above).
I am guessing there is something that needs done with the dataset since it shows 25.24 TiB available after the pool was extended? I cant quite figure out the next step I need to perform in order to get the second vdev incorporated into our pool so it can be used to increase the size of our zvol.
I have tried to troubleshoot this issue by deleting the pool and recreating it. This time, I added the first vdev (5 - 6TB disks with RaidZ1). I then extended the pool by creating the second vdev (5 - 6TB disks with RaidZ1). After this, I saw that I had the desired 42.18 TiB available in our dataset, which if I tool 80% of that and turned it into a zvol (42.18 * 0.8 = 33.74 TiB). I can successfully create our desired 33.74 TiB zvol if I extend the pool before creating the zvol. This is a workaround for the time being, but in the future when we add additional storage to this pool, I would like to know how to get around this issue.
Any help would be greatly appreciated!
