ESOS + write-back caching mechanisms using SSD... anyone?

[Robson Felix]

I was wondering whether I would replace my current RAID card (an Adaptec 6805E without a battery backup unit) due to write-back caching when I came across the documentation that explains the different caching mechanisms already available in ESOS through SSD caching: bcache, dm-cache, EnhanceIO and lvmcache.

Have any of you guys implemented this with success? Care to share your experience?

Cheers,
Robson

[Marc Smith]

Hi Robson,

I personally haven't used any of the "software" caching solutions with write-cache enabled in a production environment, but if I do one of these setups in the future, I would probably test with bcache and lvmcache -- I'm only choosing those based on my limited testing, and how those function (usability) and the community behind each, I have done no performance testing between the four. And honestly I'm not even sure that all 4 of them support write-back cache mode, but I'm 99% sure that bcache definitely does, lvmcache might too.

You could also look at using a hardware-based SSD write-cache solution like LSI's CacheCade 2.0... I'm sure Adaptec has one too.

--Marc

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[Robson Felix]

Marc, the card I have does not support the maxCache from Adaptec. I would need to replace the card I actually have. I will test bcache and let you know what the results are, but from what I read it seems that bcache is the best option.

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[Kristián Feldsam]

Hi, I used Btier and its working good and looks stable for production use.

Dňa štvrtok, 23. júla 2015 7:41:55 UTC+2 Robson Felix napísal(-a):

[Dan Swartzendruber]

I have been using enhanceio.  In write-through mode, though.  What I liked about it is it is fail-safe and I don't need to do anything to integrate with an existing block device containing a filesystem...