Snapshots also only store the difference from the last snapshot and when
combined with send/receive are very efficient for replication through
transmission to remote servers.
Sent from my iPad
> On Mar 16, 2014, at 3:40 PM, Simon Casady <capcas...@gmail.com> wrote:
> An advantage of snapshots is with active filesystems such as those used by a
> database. For a consist at database backup you of course need to stop the
> program then backup then restart ( or use some database tool if available) .
> The time to create a snapshot is essentially zero so the above start - stop
> is actually practical. Then you use your backup software of choice on the
> snapshot not the active file system.
>> On Sun, Mar 16, 2014 at 7:16 AM, roemer <uwe.ro...@gmail.com> wrote:
>> Thanks for the response, Björn.
>> The hint regarding dataset-specific snapshots is good, though I have to
>> first think about how I would best make use of them.
>> However another point that you raised is interesting:
>>> On Sunday, 16 March 2014 10:34:52 UTC+11, Bjoern Kahl wrote:
>>> Under Mac OSX, a mounted file system comes at higher costs than on
>>> other Unix like operating systems, due to the Finder and MDS services,
>>> so I would not suggest to really try to have hundreds of file systems
>>> mounted at the same time. But any reasonable number (some 10) go
>>> without noticeable performance impact.
>> I would need about 10 separate mount points / data sets, so I guess this
>> would be fine.
>> MDS services however means Spotlight, but the MacZFS Wiki as well as several
>> other posts on the web give the advice to switch off spotlight for ZFS with
>> mdutil -i off mountPoint
>> Why is Spotlight thought to be evil for ZFS?
>> Or does your comment imply that these advices are outdated, and mds-indexing
>> for ZFS mount points is ok nowadays?
>> Note that I am mainly aiming to store static 'archival' data and documents
>> on ZFS, not my main user directory.
>>> [...] Snapshots can also easily be used for real
>>> off-site backups by the zfs send / receive mechanism.
>> Haven't looked at send/receive yet, but if they require network connections,
>> I am afraid classical ADSL speeds with mac 1MBit/s upload will not be much
>> And for periodic backup to an external HDD I was thinking about ChronoSync
>> or simply rsync
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