[SO]HO Software RAID5 server: which implementation should I choice?

[Arnaud Houdelette]

Miroslav Lachman a écrit :
> Arnaud Houdelette wrote:
>
> [...]
>
>> Geom_raid5 is (unfortunatly ?) not part of Freebsd base.
>> You'll have to download and install the module and utility binaries 
>> and follow the (simple) instructions from this website :
>> http://home.tiscali.de/cmdr_faako/graid5-howto.html
>>
>> In the meantime, somebody convinced me to give zfs a try, I backed up 
>> my data, converted the raid array to raidz pool and I must say I'm 
>> not disappointed.
>> + Read performance (~160 Mo/s)
>> + Instant snapshots
>> + zfs filesystems goodness
>> + better support from the community
>> - Stability issues : zfs and kernel need to be tuned
>> - Drive crash scenario may be a bit more complex
>
> Do you have any stability issues after tuning? What settings you are 
> using?
> I am testing ZFS for a short time with these values:
> vm.kmem_size="1024M"
> vm.kmem_size_max="1024M"
> vfs.zfs.prefetch_disable="1"
> kern.maxvnodes="400000"
> vfs.zfs.zil_disable="1"
>
> (on Sun Fire X2100 with 4GB of RAM and FreeBSD 7.0-RELEASE amd64)
>
> It seems to be stable.
>
> Miroslav Lachman
Hi

Box is an AMD64 3200+ with 512MB of RAM.
The only tuning I did to get rid of panics :
vm.kmem_size="512M"
vm.kmem_size_max="512M"
I did not disable prefetch nor zil.

But It's only a home NAS :  load on the filesystem is reduced : samba, 
and rarely more than 2 client PC.

Arnaud Houdelette