[FUG-BR] Raid 5 (ZFS)

[Alessandro de Souza Rocha]

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 <mdonada em 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.
>
>
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-- 
Alessandro de Souza Rocha
Administrador de Redes e Sistemas
FreeBSD-BR User #117
             Long live FreeBSD

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