Hey guys, I am running it on freeBSD. (nas4free) It's my understanding that when a resilver happens in a zpool, only the data that has actually been written to the disks gets used, not the whole array like traditional raid5 does, reading even empty blocks. I know I should be using RAIDZ2 for this size array, but I have daily backups off of this array and also this is a lab, not a production environment. In a production environment I would use raidz2 or raidz3. The bottom line is even just Raidz1 is way better than any RAID5 hardware/software solution I have come across. 1 disk with ZFS can survive 1/8 of the disk becoming destroyed apparently. ZFS itself has many protections against data corruption. Also I have scheduled a zpool scrub to run twice a week (to detect bitrot before it happens.) Anyway. I have been using linux raid since it has been available and I ask myself, why haven't I used ZFS seriously before now. - J On Thu, Dec 11, 2014 at 11:06 AM, Bacon Zombie <baconzombie@gmail.com> wrote:
Are you running ZFS and RAIDZ on Linux or BSD? On 10 Dec 2014 23:21, "Javier J" <javier@advancedmachines.us> wrote:
I'm just going to chime in here since I recently had to deal with bit-rot affecting a 6TB linux raid5 setup using mdadm (6x 1TB disks)
We couldn't rebuild because of 5 URE sectors on one of the other disks in the array after a power / ups issue rebooted our storage box.
We are now using ZFS RAIDZ and the question I ask myself is, why wasn't I using ZFS years ago?
+1 for ZFS and RAIDZ
On Wed, Dec 10, 2014 at 8:40 AM, Rob Seastrom <rs@seastrom.com> wrote:
The subject is drifting a bit but I'm going with the flow here:
Seth Mos <seth.mos@dds.nl> writes:
Raid10 is the only valid raid format these days. With the disks as big as they get these days it's possible for silent corruption.
How do you detect it? A man with two watches is never sure what time it is.
Unless you have a filesystem that detects and corrects silent corruption, you're still hosed, you just don't know it yet. RAID10 between the disks in and of itself doesn't help.
And with 4TB+ disks that is a real thing. Raid 6 is ok, if you accept rebuilds that take a week, literally. Although the rebuild rate on our 11 disk raid 6 SSD array (2TB) is less then a day.
I did a rebuild on a RAIDZ2 vdev recently (made out of 4tb WD reds). It took nowhere near a day let alone a week. Theoretically takes 8-11 hours if the vdev is completely full, proportionately less if it's not, and I was at about 2/3 in use.
-r