FreeBSD & Software RAID

Matthew Seaman m.seaman at
Tue May 26 18:38:51 UTC 2009

Gary Gatten wrote:
> Why avoid ZFS on x86?

Because in order to deal most effectively with disk arrays of 100s or 1000s
of GB as are typical nowadays, ZFS requires more than the 4GB of addressable
RAM[*] that the i386 arch can provide.

You can make ZFS work on i386, but it requires very careful tuning and is not
going to work brilliantly well for particularly large or high-throughput



[*] Technically, it requires more than the typical 2GB of kernel memory that
is the default on i386.  KVM under 64bit architectures can be *much* bigger
than that.

Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP:     Ramsgate
                                                  Kent, CT11 9PW

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