-2
votes
2answers
236 views

Why does a failed ZFS disk still seem to work fine?

Two disks just failed in my zpool with read/write errors, so I took them out and inserted them in another host, created a zpool just with them, and filled the file system with dd if=/dev/zero ...
0
votes
1answer
537 views

zfs pool error, how to determine which drive failed in the past

I had been copying data from my pool so that I could rebuild it with a different version so that I could go away from solaris 11 and to one that is portable between freebsd/openindia etc. it was ...
2
votes
2answers
859 views

can I consolidate a multi-disk zfs zpool to a single (larger) disk?

I have this zpool: bash-3.2# zpool status dpool pool: dpool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM ...
1
vote
1answer
606 views

FreeBSD: Error creating new slice using gpart

The virtual hard disk of one of my VPS has been enlarged, and I want to create a new ZFS slice using the extra space, but I couldn't be able to perform that. # gpart add -s 10G -t freebsd-zfs da0 ...
93
votes
2answers
11k views

What are the different widely used RAID levels and when should I consider them?

This is a Canonical Question about RAID levels. What are: the RAID levels typically used (including the RAID-Z family)? deployments are they commonly found in? benefits and pitfalls of each? ...
2
votes
2answers
223 views

ZFS - setting physical disk start point of pool/filesystem

I'm testing harddisk performance, and would like to test writing to the outer tracks of my harddisk with ZFS. One way of doing this would be to create a pool/filesystem with a start point just a few ...
4
votes
2answers
7k views

How do I recover from a faulted zpool where one device is OK, but was temporarily offline?

I have a zpool with 4 2TB USB disks in a raidz config: [root@chef /mnt/Chef]# zpool status farcryz1 pool: farcryz1 state: ONLINE scrub: none requested config: NAME STATE READ ...
4
votes
2answers
2k views

ZFS: How can I stop a zpool replace that's currently in progress?

A few days ago, I noticed that the ZFS pool on my home server had started reslivering a disk by itself but was no longer making any progress. The disk had some SMART errors (but did not consider ...
3
votes
2answers
6k views

How do I add a second disk to my zfs root pool

I am trying to add a new disk to my zfs root pool. Here is my current config: zpool status pool: rpool state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM ...
0
votes
6answers
4k views

ZFS - zpool ARC cache plus L2ARC benchmarking

I have been doing lots of I/O testing on a ZFS system I will eventually use to serve virtual machines. I thought I would try adding SSD's for use as cache to see how much faster I can get the read ...
10
votes
6answers
8k views

Is bit rot on hard drives a real problem? What can be done about it?

A friend is talking with me about the problem of bit rot - bits on drives randomly flipping, corrupting data. Incredibly rare, but with enough time it could be a problem, and it's impossible to ...
4
votes
2answers
1k views

ZFS hard drive configuration

I'm just wondering whether its wise to add 4x500Gb and 2x750 into the same ZFS pool? Or should we only add the same size hdd's to the pool? Any documentation would be really handy or guidelines on ...