Hello,
I'm trying to migrate from tiered Windows Storage Spaces volume where I have 2 HDD's (3TB and 4TB) in a slow tier and a 512GB SSD in a fast tier.
Windows is, and TrueNAS will be, virtualized with disks connected to a passed-through HBA. Performance is fairly important as I have VM's that store data (not boot or os data) on iSCSI disks. The amount of RAM available to assign to the TrueNAS VM is about 40GB. Storage Spaces deduplication saves me about 1.5TB. I'm wondering if there is a way to calculate how much savings compression would net me considering I don't have enough memory for zfs dedupe. I'd rather have more storage than disk redundancy so I'm assuming I can place each of the HDD's in their own VDEV and place those VDEV's in a pool.
I'm having trouble figuring out where the SSD should fit in. Ideally I would add it to a "tiered" vdev so I have 7.5TB of raw writable storage but I don't think that's possible in zfs. I probably also shouldn't make it an L2ARC because of the aforementioned RAM problem and because it feels like a waste of SSD storage. SLOG also feels like a waste of storage. I'm planning to add a 32GB virtual disk backed by a gen 4 nvme drive for that purpose.
I'm trying to migrate from tiered Windows Storage Spaces volume where I have 2 HDD's (3TB and 4TB) in a slow tier and a 512GB SSD in a fast tier.
Windows is, and TrueNAS will be, virtualized with disks connected to a passed-through HBA. Performance is fairly important as I have VM's that store data (not boot or os data) on iSCSI disks. The amount of RAM available to assign to the TrueNAS VM is about 40GB. Storage Spaces deduplication saves me about 1.5TB. I'm wondering if there is a way to calculate how much savings compression would net me considering I don't have enough memory for zfs dedupe. I'd rather have more storage than disk redundancy so I'm assuming I can place each of the HDD's in their own VDEV and place those VDEV's in a pool.
I'm having trouble figuring out where the SSD should fit in. Ideally I would add it to a "tiered" vdev so I have 7.5TB of raw writable storage but I don't think that's possible in zfs. I probably also shouldn't make it an L2ARC because of the aforementioned RAM problem and because it feels like a waste of SSD storage. SLOG also feels like a waste of storage. I'm planning to add a 32GB virtual disk backed by a gen 4 nvme drive for that purpose.