Date: Sun, 20 Apr 2008 21:03:15 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Arnaud Houdelette <arnaud.houdelette@tzim.net> Cc: freebsd-stable@freebsd.org Subject: Re: [SO]HO Software RAID5 server: which implementation should I choice? Message-ID: <480B9373.50603@quip.cz> In-Reply-To: <480AE7AA.5090204@tzim.net> References: <396418019.20080409104542@serebryakov.spb.ru> <47FCBAFB.9060508@tzim.net> <4956a5e50804191912g52833c35q868827dc2b54e5ae@mail.gmail.com> <480AE7AA.5090204@tzim.net>
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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
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