da uma lida que vai entender. http://blogs.sun.com/bonwick/entry/raid_z
Em 5 de maio de 2010 14:18, Márcio Luciano Donada <mdon...@gmail.com> escreveu: > Em 5/5/2010 01:27, Nenhum_de_Nos escreveu: >> >> Renato, >> >> salvo engano, raidz no zfs num faz o mesmo que Raid5 ? (seria somente um >> apelido do zfs) (naõ achei página falando agora, num procurei tanto tb :) >> >> > > > Da man page do zpool > > raidz A variation on RAID-5 that allows for better distribution of > raidz1 parity and eliminates the "RAID-5 write hole" (in which data > raidz2 and parity become inconsistent after a power loss). Data and > parity is striped across all disks within a raidz group. > > A raidz group can have either single- or double-parity, > mean- > ing that the raidz group can sustain one or two > failures > respectively without losing any data. The raidz1 > vdev type > specifies a single-parity raidz group and the > raidz2 vdev > type specifies a double-parity raidz group. The > raidz vdev > type is an alias for raidz1. > > A raidz group with N disks of size X with P parity > disks can > hold approximately (N-P)*X bytes and can > withstand P > device(s) failing before data integrity is > compromised. The > minimum number of devices in a raidz group is one > more than > the number of parity disks. The recommended number is > between > 3 and 9 to help increase performance. > > > ------------------------- > Histórico: http://www.fug.com.br/historico/html/freebsd/ > Sair da lista: https://www.fug.com.br/mailman/listinfo/freebsd > -- Alessandro de Souza Rocha Administrador de Redes e Sistemas FreeBSD-BR User #117 Long live FreeBSD Powered by .... (__) \\\'',) \/ \ ^ .\._/_) www.FreeBSD.org ------------------------- Histórico: http://www.fug.com.br/historico/html/freebsd/ Sair da lista: https://www.fug.com.br/mailman/listinfo/freebsd
