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Re: elevator question

To: weber@xxxxxxxxxx
Subject: Re: elevator question
From: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Date: Tue, 18 Mar 2014 14:56:05 +0100
Cc: Xfs <xfs@xxxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <ac1d082430f0dfa45709ef3c7912a53f@xxxxxxxxxx>
Organization: Intellique
References: <ea0e10e64a65dbd39cd71a826e18985e@xxxxxxxxxx> <53277C56.7000002@xxxxxxxxxxxxxxxxx> <20140318102657.2ba68f00@xxxxxxxxxxxxxx> <ac1d082430f0dfa45709ef3c7912a53f@xxxxxxxxxx>
Le Tue, 18 Mar 2014 11:18:04 +0100
Marko Weber|8000 <weber@xxxxxxxxxx> écrivait:

> i am barely new to this issue. What would you xfs guys recommend me?
> i prefer things i can do with kernel, so its dm-cache? bcache?

The easier will be bcache because it comes included with the kernel.

> the raid is an raid5 with 3 disks at moment. xfs filesystem.
> do i have to format it again and set special things?

No, only the cache itself must be reformatted.

> i use nobarrier at moment,

if you're not using a hardware RAID controller with a battery-backed or
flash-based cache, it may be risky. Depends mostly on your write
activity and power supply stability, though.


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