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.
Regards,
Vijay
[1]
http://www.gluster.org/community/documentation/index.php/Features/data-classification
[2]
http://www.gluster.org/community/documentation/index.php/Features/Brick_Failure_Detection
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