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
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