[CentOS] cyrus spool on btrfs?

Fri Sep 8 20:06:19 UTC 2017
John R Pierce <pierce at hogranch.com>

On 9/8/2017 12:52 PM, Valeri Galtsev wrote:
> Thanks. That seems to clear fog a little bit. I still would like to hear
> manufacturers/models here. My choices would be: Areca or LSI (bought out
> by Intel, so former LSI chipset and microcode/firmware) and as SSD Samsung
> Evo SATA III. Does anyone who used these in hardware RAID can offer any
> bad experience description?

Does the Samsung EVO have supercaps and write-back buffer protection?  
if not, it is in NO way suitable for reliable use in a raid/server 

as far as raiding SSDs go, the ONLY raid I'd use with them is raid1 
mirroring (or if more than 2, raid10 striped mirrors). And I'd probably 
do it with OS based software raid, as thats more likely to support SSD 
trim than a hardware raid card, plus allows the host to monitor the SSDs 
via SMART, which a hardware raid card probably hides.

I'd also make sure I undercommit the size of the SSD, so if its a 500GB 
SSD, I'd make absolutely sure to never have more than 300-350GB of data 
on it.   if its part of a stripe set, the only way to ensure this is to 
partition it so the raid slice is only 300-350GB.

john r pierce, recycling bits in santa cruz