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1 disk storage expansion? You do 'zpool add' IIRC.
by RantyDave 8y ago
1 disk storage expansion? You do 'zpool add' IIRC.
- zaarn 8y agoThat doesn't give you RAID protection, sadly, with mdadm and LVM you can add a single disk into an existing array, ZFS requires you to pull up a new RAID array (vdev) and at minimum 2 devices if you want something better than a RAID 0.
- snuxoll 8y agoI don’t run Z-RAID 5/6 personally so it’s been a non issue, but that functionality is in the works right now.
- zaarn 8y agoIt is in the works but the question is how many years until it's stable and available to all end users and how well it works (IIRC from a talk on this topic, it had some limitations as well). This also affects the RAID1 setup, any storage expansion requires 2 disk to pull up a new RAID1 into the pool.
- snuxoll 8y agoMirrors, unlike RAID-Z, can be added later. They can even be detached from the pool as long as one mirror from the device remains.
- PhantomGremlin 8y agoin the works right now I don't know where you read that, but don't be fooled. That functionality has been "in the works" for quite a long time. But it hasn't yet appeared. In the past it has been said that something called "block pointer rewrite" was a prerequisite. Just google for that. Here's some 10 year old information about it. At that time it was already a "frustratingly frequent request." I stopped searching when I found something 10 years old, but I'm sure you with some effort you could go back much further than that. https://blogs.oracle.com/ahl/expand-o-matic-raid-z https://blogs.oracle.com/ahl/expand-o-matic-raid-z