[DRBD-user] using SSD drives, the TRIM challenge

Bart Coninckx bart.coninckx at telenet.be
Fri Mar 9 08:35:12 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Christoph,

thx, that's reaussuring. I was not planning on using RAID though, the 
SSD would just be there for Dom0 and all the OS partitions of the DomUs. 
I may not got to the 4 years this way, but Ii hope to be able to get to 
at least have of that or something,

cheers,

B.


On 03/08/12 12:10, Christoph Roethlisberger wrote:
> We are using consumer grade SSD drives in a few of our servers for 4+ 
> years now. (started with MTRON devices, switched to Intel later on and 
> lately also some Samsung drives)
> Though we just started using SSD drives as DRBD backend storage 
> (hardware RAID6 - thus no TRIM anyways) we use similar configurations 
> in storage arrays for high IO performance virtual machines. (ESX mostly)
> So far we had zero problems with it and no measurable performance 
> degradation and only one drive from the 100+ we have, failed so far. 
> Though this happened already after one of two weeks in operation and 
> was an electronic problem and not due to NAND wear out.
>
> As long as the drives have some internal GarbageCollection (as most do 
> nowadays) and you make sure that they do never fill up completeley 
> (normally we format such arrays to a max of 90% of available space) 
> the absence of TRIM can be neglected in my opinion.
>
> As far as TRIM support in DRBD goes - I don't know.
> LVM may support it already in RAID0/1 setups, but MDRaid nor any 
> hardware RAID does it, (and hardware raid support may never ever 
> come/work beside raid0/1 setups) so this limits the use of TRIM 
> support in DRBD quite much.
>
>
> Christoph
>
>
>
>> Hi all,
>>
>> I was wondering if anyone is successfully SSD drives as their backend 
>> storage devices. If so, I'm wondering if these drives do no degrade 
>> quite fast seen there is no TRIM support in DRBD.
>>
>> I'm also wondering if can motivate people to help sponsor this 
>> feature. If the group is large enough, I suppose we can get this done 
>> for not too much money.
>
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