Can Vdevs be different sizes?

Can Vdevs be different sizes?

Yes, you could. That would give you 15 + 6 TB = 21 TB, but it would be slower than an equal configuration. You can upgrade each disk of each vdev separately – the whole vdev always has the size of the smallest disk in it.

Can ZFS use different size drives?

2 Answers. Yes this is possible. The only requirement is that the mirrored pairs within the pool are the same size. ZFS does prefer to use the raw drive so ideally this means drives of the same size.

What is Vdev in ZFS?

vdev. Each zpool consists of one or more vdevs (short for virtual device). Each vdev, in turn, consists of one or more real devices . Most vdevs are used for plain storage, but several special support classes of vdev exist as well—including CACHE , LOG , and SPECIAL.

Is ZFS expandable?

The new feature allows a ZFS user to expand the size of a single RAIDz vdev. For example, you can use the new feature to turn a three-disk RAIDz1 into a four, five, or six RAIDz1.

Which is better FreeNAS or UnRAID?

Both FreeNAS and UnRAID are worthy solutions for creating your own file server. Our take is that FreeNAS is the better solution for those seeking traditional RAID with a tried and true volume manager/file system, while UnRAID is better if you’re seeking maximum capacity for non-critical data sets.

What is ZFS mirror?

ZFS is an advanced file system that is capable of managing data that spans across devices. ZFS uses virtual storage pools, called zpools. A zpool can contain numerous directories and can provide redundancy for your data. I want to show you how to set up a ZFS mirror (RAID1) pool using two external disks.

Is ZFS better than ext4?

ZFS may be the best-known enterprise-grade transactional file system to use storage pools to manage physical storage space. ZFS supports advanced file systems and can manage data long term whereas ext4 cannot.

Can you expand a Vdev?

You can’t just add a single disk to the existing 3-disk RAIDZ vdev to create a 4-disk RAIDZ vdev because vdevs can’t be expanded. The impact of this limitation is that you have to buy all storage upfront even if you don’t need the space for years to come.

How do you increase the size of a ZFS pool?

So the bottom line is ,you can’t reduce the zpool size but it can be increased on fly by adding new LUNS or DISKS to the zpool….RAIDZ Zpool:

1. Check the existing RAIDZ pool status.
2. Add a new LUN/Disk to the oracle-RZ to extend the zpool size.
3. Check the zpool status.

What are the different types of vdevs in ZFS?

Each vdev, in turn, consists of one or more real devices. Most vdevs are used for plain storage, but several special support classes of vdev exist as well—including CACHE, LOG, and SPECIAL. Each of these vdev types can offer one of five topologies—single-device, RAIDz1, RAIDz2, RAIDz3, or mirror.

Which is the uppermost structure in ZFS?

The zpool is the uppermost ZFS structure. A zpool contains one or more vdevs, each of which in turn contains one or more devices. Zpools are self-contained units—one physical computer may have two or more separate zpools on it, but each is entirely independent of any others. Zpools cannot share vdevs with one another.

Can a ZFS pool survive a cache loss?

Modern zpools can survive the loss of a CACHE or LOG vdev—though they may lose a small amount of dirty data, if they lose a LOG vdev during a power outage or system crash. It is a common misconception that ZFS “stripes” writes across the pool—but this is inaccurate.

Can you install FreeNAS on a ZFS vdev?

In the second case, perhaps even a bootstrap might be nice, that is to start with a FreeBSD install which is configured (ZFS vdevs/pools as desired) and then FreeNAS is directly installed over it by way of a script (bootstrap) which is suited for that situation.