Date: Thu, 10 May 2007 15:46:05 -0700 From: Bakul Shah <bakul@bitblocks.com> To: efinley@efinley.com Cc: freebsd-current@freebsd.org Subject: Re: ZFS the perfect FS? if only... Message-ID: <20070510224605.C05365B5A@mail.bitblocks.com> In-Reply-To: Your message of "Thu, 10 May 2007 14:31:45 MDT." <cbi6431a042bfp601o08c5pp7abbqmpm54@4ax.com>
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> If you could start with a 3 drive zraid2 as the underlying pool > storage and later add drives to the existing zraid2 as space was > needed, then ZFS would be the ultimate FS (at least for me). > > Any takers? How hard would this be? You can do something like this: zpool create foo raidz2 dev0 dev1 dev2 dev3 zpool add foo raidz2 dev4 dev5 dev6 dev7 The new devices are in a different raidz2 group but but *all of the space* will be used for any filesystem on this pool -- isn't this good enough and if not, why? If you add a new disk to the same raid, you have to redistirbute most data. Not worth it Note you need at least 3 disks for raidz and 4 disks for raidz2. In general you want to put almost all your disks in a single pool but not in a single mirror, raidz or raidz2. Root zfs should be in its own pool and perhaps databases. See http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide
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