Date: Wed, 26 Oct 2022 13:32:48 +0000 From: <julio@meroh.net> To: "freebsd-questions@FreeBSD.org" <freebsd-questions@FreeBSD.org> Subject: Setting up ZFS L2ARC on a zvol Message-ID: <PH0PR20MB370438AB8180CE27187E3BD2C0309@PH0PR20MB3704.namprd20.prod.outlook.com>
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Hello, I'm setting up a new machine in which I have an NVMe drive and a bunch of hard disks. The hard disks are going to be a ZFS pool and the NVMe drive is going to be the root file system + the L2ARC for the pool. Now... I'm considering using ZFS as well for the root file system (as a separate single-drive pool) in order to simplify admin operations: I want to host some VMs on the NVMe for speed, and using zvols will be very helpful as I don't have to come up with the partition sizes upfront. And here comes the question: can the L2ARC of the hard disk pool be backed by a zvol on the NVMe pool (again, so that I don't have to use fixed-size partitions)? I gave a simple try to this setup and it's not working, so I'm wondering if this is just not a good idea and thus is unsupported, or if there is a bug: root@think:~ # zfs create -V 16G -o primarycache=none zroot/l2arg root@think:~ # zpool add scratch cache zvol/zroot/l2arc cannot add to 'scratch': no such pool or dataset root@think:~ # Oct 26 05:45:28 think ZFS[3677]: vdev problem, zpool=scratch path=/dev/zvol/zroot/l2arc type=ereport.fs.zfs.vdev.open_failed root@think:~ # ls /dev/zvol/zroot/l2arc /dev/zvol/zroot/l2arc Thanks!help
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