Through searching this forum I have discovered that creating striped mirrors simulates RAID 10 , but I have not seen anything about RAID 0+1. I intended to follow the same steps but in reverse to create two vDevs of striped disks then mirror them. That was until I read the informative presentation by Cyberjock, which states that when one vDev goes down the entire zPool is lost. If I understand the presentation correctly, mirroring two stripes in the same zPool would provide zero redundancy.
Is there a way to configure FreeNAS to simulate traditional RAID 0+1 which would allow a disk in either set to fail and have the other set continue to work until the bad disk is replaced (presuming that a disk in the good set doesn’t fail before the RAID is able to be rebuilt)? This volume will primarily be used for file sharing, not long term storage or any mission critical data, so I value transfer speed over redundancy. That’s why I didn’t opt for the striped mirror approach to create RAID 10 (but I require some level or redundancy).
Currently, I have two volumes each containing three striped disks mounted to different directories on my computer. I use a backup utility called SyncBack from 2 Bright Sparks to synchronize the volumes at scheduled intervals. When a disk in one stripe fails the data from the good set is copied to the newly build array after replacing the bad disk. The striped configuration provides the speed boost for writes, but because the data is not mirrored no increase in read speed.
If RAID 0+1 is not possible with ZFS I’m hoping at lease there is a way to have the FreeNAS server automatically copy data between volumes for increased redundancy and eliminate that processing load on the client machine.
Is there a way to configure FreeNAS to simulate traditional RAID 0+1 which would allow a disk in either set to fail and have the other set continue to work until the bad disk is replaced (presuming that a disk in the good set doesn’t fail before the RAID is able to be rebuilt)? This volume will primarily be used for file sharing, not long term storage or any mission critical data, so I value transfer speed over redundancy. That’s why I didn’t opt for the striped mirror approach to create RAID 10 (but I require some level or redundancy).
Currently, I have two volumes each containing three striped disks mounted to different directories on my computer. I use a backup utility called SyncBack from 2 Bright Sparks to synchronize the volumes at scheduled intervals. When a disk in one stripe fails the data from the good set is copied to the newly build array after replacing the bad disk. The striped configuration provides the speed boost for writes, but because the data is not mirrored no increase in read speed.
If RAID 0+1 is not possible with ZFS I’m hoping at lease there is a way to have the FreeNAS server automatically copy data between volumes for increased redundancy and eliminate that processing load on the client machine.