Disk replacement procedure for a ZFS Raid 1 install.

[fireon]

You can not really compare mdadm with zfs. You can also not compare an mercedes with an trabant ZFS has more features. In ZFS is everything directly implemented. Mdadm is an extra layer.

ZFS es much more easier to handle, more flexible, and faster in raid. I had a lot of year's mdadm and also hwraid. Never again. I spend tests really a lot of hours, and we did longtimetest.

The also one bad thing what we've seen is that zfs really need RAM, RAM, RAM RAM... At workstations we do this with 16GB RAM, on Server for virtualisation we do this with at least 64GB/128GB RAM.

Ask Google: https://www.google.de/webhp?sourcei...spv=2&ie=UTF-8&client=ubuntu#q=mdadm v.s. zfs

But for me it was the best thing to test it. To see the advantages and disadvantages.

 

[vigilian]

@fireon since you've made a such big publicity for zfs, i've tried it on my home proxmox server for testing and it does not really what it should do about RAID perf.
but maybe you would be interested in helping?
https://forum.proxmox.com/threads/zfs-and-i-o-delay-measurements-in-proxmox-4-1-33.27047/
best regards

 

[fireon]

Hello vigilian,

yes i know this problems. Good... i doesn't have this problem. Copy with over 300mb/s with 6 Disks (SAS controller). But yes the perfomance can be tenfold when you add SSD vor Cache to your machine. On some customer it is necessary. Here some information about:
https://forum.proxmox.com/threads/zfs-incredibly-low-iops-and-fsyncs-on-raidz-1-4-wd-red.26728/