[Gluster-users] two questions regarding glusterfs cluster: tierd storage and hotspare brick

Vijay Bellur vbellur at redhat.com
Wed Dec 31 16:53:13 UTC 2014

On 12/28/2014 02:07 PM, Zhu,Chao wrote:
> hi, all,
>      We are using gluster 3.5.2 on standard 3TB*12 machines, some hosts
> also got SSD on the machines as well;
> two questions:
> 1. Is there mature solution, I can use the SSD as the write cache for
> sata disks? So I can combine the power of SSD as write cache(and even
> read cache), and the capacity provided by SATA disks?

Data tiering feature being developed for 3.7 can help here. More details 
about tiering can be found in this larger proposal for data 
classification [1].

> 2. As sata disks fails often(relatively, when you got lots of disks...),
> each time a disk fails, i will have to manually replace the disks, and
> replace the bricks;
>      Can we setup spare bricks?
>       Say, I have 12*3TB sata disks, I only use 10 disks as 10 Bricks
> with data on it, and have 2 disks configured with filesystem, as part of
> volume, without putting data on the brick/filesystem? So in case on
> brick fails, this brick automatically replace that failed disks? Just
> like hotspare in raid?

There's no automatic mechanism to do this from the CLI today. GlusterFS 
has the ability to detect brick failures [2] and also to perform an 
online replacement of a brick in a volume. By combining these two 
features and defining a mechanism in management to add/remove spare 
bricks, this functionality can be achieved.




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