C2Opps
Dabbler
- Joined
- Jun 11, 2018
- Messages
- 25
Hi All,
Build: FreeNAS-11.1-U6
System use: Veeam Backup repository / Template VM’s (that are just deployed to our primary storage from there) - no live workloads on the system
We built a FreeNAS storage server in a 24 drive Supermicro chassis last year (With the excellent of advice of some members of this forum) and used 8TB drives arranged in 2VDEV’s of six Drives each both using RAIDZ2. We’re looking to add some more capacity in the spare slots of the chassis and since the only bottleneck to adding more drives at the moment is slots in the case was considering using larger drives for the new VDEV.
The disks we were thinking of using were 12TB / 14TB / 16TB Exos drives that are rated for the vibration of very large amounts of drives per enclosure.
Have been doing a decent amount of googling and not really found that much of a consensus when it comes to using drives that large and if it is an issue for RAID rebuild using RAIDZ2
The scenario I’m aiming to avoid is during a rebuild a second drive fails and then you get a URE on one of the remaining disks or a third full failure. This got me thinking would it be worth using RAIDZ3 for such large drives but haven’t managed to find anything definitive
There is also the issue of mixing VDEV types in the same pool, if there were enough disks in the RAIDZ3 VDEV would add it give roughly the same performance increase of adding another 6 drive RAIDZ2 identical to the existing two RAIDZ2 VDEV’s and therefore give the equivalent of an additional single spindle in the pool ?
could people please let me know their thoughts on this and perhaps point me to some relevant analysis?
Build: FreeNAS-11.1-U6
System use: Veeam Backup repository / Template VM’s (that are just deployed to our primary storage from there) - no live workloads on the system
We built a FreeNAS storage server in a 24 drive Supermicro chassis last year (With the excellent of advice of some members of this forum) and used 8TB drives arranged in 2VDEV’s of six Drives each both using RAIDZ2. We’re looking to add some more capacity in the spare slots of the chassis and since the only bottleneck to adding more drives at the moment is slots in the case was considering using larger drives for the new VDEV.
The disks we were thinking of using were 12TB / 14TB / 16TB Exos drives that are rated for the vibration of very large amounts of drives per enclosure.
Have been doing a decent amount of googling and not really found that much of a consensus when it comes to using drives that large and if it is an issue for RAID rebuild using RAIDZ2
The scenario I’m aiming to avoid is during a rebuild a second drive fails and then you get a URE on one of the remaining disks or a third full failure. This got me thinking would it be worth using RAIDZ3 for such large drives but haven’t managed to find anything definitive
There is also the issue of mixing VDEV types in the same pool, if there were enough disks in the RAIDZ3 VDEV would add it give roughly the same performance increase of adding another 6 drive RAIDZ2 identical to the existing two RAIDZ2 VDEV’s and therefore give the equivalent of an additional single spindle in the pool ?
could people please let me know their thoughts on this and perhaps point me to some relevant analysis?