Using an SSD "disk" for /

[Julian Elischer]

On 11/2/10 10:31 AM, Mikhail T. wrote:
> Hello!
>
> I'm setting up a new system and would like to use a moderate (64Gb 
> or 128Gb) SSD-drive to boot from.
>
> This will house /, /var, /home, and the /usr/local and thus see 
> plenty of activity, whenever src and ports are updated, or "world" 
> is remade, or packages are upgraded. I'm hoping, these operations 
> would be much faster, than with a regular HDD.
>
> However, people mention, that SSDs develop /severe/ performance 
> degradation if written to A LOT -- unless some SDD-specific 
> operation (TRIM) is used, but not all Operating Systems support 
> that... Does FreeBSD-8? Is that sufficient, or will an SSD degrade 
> quickly anyway?

there are trim patches but not in the OS by default as yet.

>
> Does anyone use an SSD under FreeBSD? Which brand/model? Are you 
> happy with it?

I don't use it for / it's a waste.. / is usually not such a high 
priority in terms of performance etc..
usually I use flash for data regions.
>
> Also, what parameters should I give to newfs? SSDs' characteristics 
> seem rather different from HDDs', so it is unlikely, that newfs' 
> defaults will be optimal for an SSD... Would a different filesystem 
> (ZFS?) be a better choice, than FFS, for these devices?
>
> Other thoughts? Thank you very much! Yours,
>
>    -mi
>
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