[Cialug] Transplant OS

[Zachary Kotlarek]

On Jun 25, 2009, at 5:54 PM, Don Cady wrote:

> My quick answer is ZFS.


I know ZFS is the /. answer for all recent disk and file-system  
related questions, but even after looking in to it I'm still not clear  
what it buys me over RAID + LVM2 + JFS. RAID-Z/RAID-Z2 isn't a bad  
plan, but at least personally I'm either running RAID-1 (where RAID-Z  
offers little benefit and additional restrictions) or against some  
hardware device that provides RAID transparently.

Plus I'm not sold on the conflation of file system and disk array that  
ZFS requires; while it has benefits it is necessarily more fragile  
because of the interdependence. Plus there's currently no way to grow  
a group in ZFS, so you have to add at least 2 disks at at time (or 3  
if you want to actually take advantage of RAID-Z) which can make live  
migrations more complicated.

I'd honestly be interested to know what all the hubbub is about. Am I  
just missing something? Is in-line checksumming something I'm really  
supposed to care about even on hardware that doesn't have a  
significant bit-flip rate? Is it just that I don't run any RAID-5  
arrays and therefore don't care about parity generation and write holes?


> EMC, NetApp, etc also have products


Which are great, and if I could afford them I wouldn't bother with LVM  
or ZFS. But such devices don't fit into most small-business IT  
budgets, and certainly aren't going to be connected my personal  
servers anytime soon.

	Zach

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