ZFS 2.3 released with ZFS raidz expansion
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Re: ZFS 2.3 released with ZFS raidz expansion
#2After years in the making ZFS raidz expansaion is finally here.
Major features added in release:
- RAIDZ Expansion: Add new devices to an existing RAIDZ pool, increasing storage capacity without downtime.
- Fast Dedup: A major performance upgrade to the original OpenZFS deduplication functionality.
- Direct IO: Allows bypassing the ARC for reads/writes, improving performance in scenarios like NVMe devices where caching may hinder efficiency.
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#3After years in the making ZFS raidz expansaion is finally here. Major features added in release: - RAIDZ Expansion: Add new devices to an existing RAIDZ pool, increasing storage capacity without downtime. - Fast Dedup: A major performance upgrade to the original OpenZFS deduplication functionality. - Direct IO: Allows bypassing the ARC for reads/writes, improving performance in scenarios like NVMe devices where cachi…
But I presume it is still not possible to remove a vdev.
Re: ZFS 2.3 released with ZFS raidz expansion
#4It's good to see that they were pretty conservative about the expansion.
Not only is expansion completely transparent and resumable, it also maintains redundancy throughout the process.
That said, there is one tiny caveat people should be aware of:
> After the expansion completes, old blocks remain with their old data-to-parity ratio (e.g. 5-wide RAIDZ2, has 3 data to 2 parity), but distributed among the larger set of disks. New blocks will be written with the new data-to-parity ratio (e.g. a 5-wide RAIDZ2 which has been expanded once to 6-wide, has 4 data to 2 parity).
Re: ZFS 2.3 released with ZFS raidz expansion
#5After years in the making ZFS raidz expansaion is finally here. Major features added in release: - RAIDZ Expansion: Add new devices to an existing RAIDZ pool, increasing storage capacity without downtime. - Fast Dedup: A major performance upgrade to the original OpenZFS deduplication functionality. - Direct IO: Allows bypassing the ARC for reads/writes, improving performance in scenarios like NVMe devices where cachi…
But I presume it is still not possible to remove a vdev.
Is this possible elsewhere (re: other filesystems)?
Re: ZFS 2.3 released with ZFS raidz expansion
#6After years in the making ZFS raidz expansaion is finally here. Major features added in release: - RAIDZ Expansion: Add new devices to an existing RAIDZ pool, increasing storage capacity without downtime. - Fast Dedup: A major performance upgrade to the original OpenZFS deduplication functionality. - Direct IO: Allows bypassing the ARC for reads/writes, improving performance in scenarios like NVMe devices where cachi…
The first 4 seem like really big deals.
Re: ZFS 2.3 released with ZFS raidz expansion
#7This is huge news for ZFS users (probably mostly those in the hobbyist/home use space, but still). raidz expansion has been one of the most requested features for years.
Re: ZFS 2.3 released with ZFS raidz expansion
#8Earlier quoted context omitted.
But I presume it is still not possible to remove a vdev.
Is this possible elsewhere (re: other filesystems)?
It is possible with windows storage space (remove drive from a pool) and mdadm/lvm (remove disk from a RAID array, remove volume from lvm), which to me are the two major alternatives. Don't know about unraid.
Re: ZFS 2.3 released with ZFS raidz expansion
#9Earlier quoted context omitted.
Is this possible elsewhere (re: other filesystems)?
It is possible with windows storage space (remove drive from a pool) and mdadm/lvm (remove disk from a RAID array, remove volume from lvm), which to me are the two major alternatives. Don't know about unraid.
> It is possible with windows storage space (remove drive from a pool) and mdadm/lvm (remove disk from a RAID array, remove volume from lvm), which to me are the two major alternatives. Don't know about unraid.
Perhaps I am misunderstanding you, but you can offline and remove drives from a ZFS pool.
Do you mean WSS and mdadm/lvm will allow an automatic live rebalance and then reconfigure the drive topology?