Hey!
I got confused with some RAIDz1 statements in the FreeNAS v8.3.1 User Guide.
The manual says nothing about RAIDz1 array failures (at least in the RAID Overview - Page 15), but it clarifies how RAIDz2 in theory works.
Some FreeNAS guide quotes:
As per what I found on Google, RAIDz1 supports up to 1 disk to go down without data loss (in theory), and RAIDz2 supports up to 2 disks to go down within the array without data loss.
Which one is wrong?
Could any of you confirm if I'm on the right path to work with a 3 disks RAIDz1 array without possibilities to loose data if a disk dies?
Thanks in advance!
I got confused with some RAIDz1 statements in the FreeNAS v8.3.1 User Guide.
The manual says nothing about RAIDz1 array failures (at least in the RAID Overview - Page 15), but it clarifies how RAIDz2 in theory works.
Some FreeNAS guide quotes:
RAIDZ1: ZFS software solution that is equivalent to RAID5. Its advantage over RAID 5 is that it
avoids the write-hole and does not require any special hardware, meaning it can be used on commodity
disks. If your FreeNAS® system will be used for steady writes, RAIDZ is a poor choice due to the
slow write speed. (until here, nothing is mentioned about failure points).
RAIDZ2: double-parity ZFS software solution that is similar to RAID-6. Its advantage over RAID 5 is
that it also avoids the write-hole and does not require any special hardware, meaning it can be used on
commodity disks. RAIDZ2 allows you to lose one drive without any degradation as it basically
becomes a RAIDZ1 until you replace the failed drive and restripe. At this time, RAIDZ2 on FreeBSD
is slower than RAIDZ1.
As per what I found on Google, RAIDz1 supports up to 1 disk to go down without data loss (in theory), and RAIDz2 supports up to 2 disks to go down within the array without data loss.
Which one is wrong?
Could any of you confirm if I'm on the right path to work with a 3 disks RAIDz1 array without possibilities to loose data if a disk dies?
Thanks in advance!