Date: Tue, 22 Apr 2008 17:00:02 +0200 From: Arnaud Houdelette <arnaud.houdelette@tzim.net> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-stable@freebsd.org Subject: Re: [SO]HO Software RAID5 server: which implementation should I choice? Message-ID: <480DFD72.7060109@tzim.net> In-Reply-To: <480B9373.50603@quip.cz> References: <396418019.20080409104542@serebryakov.spb.ru> <47FCBAFB.9060508@tzim.net> <4956a5e50804191912g52833c35q868827dc2b54e5ae@mail.gmail.com> <480AE7AA.5090204@tzim.net> <480B9373.50603@quip.cz>
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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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