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*Clone* vs *Mirror*?
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Forum Regular
Join Date: Nov 2003
Status:
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Is there a difference in the terms Clone and Mirror? Or are the words interchangeable?
Thank you!
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JudieKaren
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Junior Member
Join Date: Feb 2004
Location: Portland ME
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There tends to be a difference, yes.
"Clone" suggests a file-for-file backup of a folder or volume from one location to another.
"Mirror" generally applies only to folders which are synchronised with each other periodically, and it suggests that the synchronisation goes both ways - for instance, if a new file is created in either one of the two locations, it will be copied to the other at the next backup.
Does this clarify things?
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Hi. Nice to see you. You look lovely.
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Forum Regular
Join Date: Nov 2003
Status:
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Originally posted by AWShuttleworth:
There tends to be a difference, yes.
"Clone" suggests a file-for-file backup of a folder or volume from one location to another.
"Mirror" generally applies only to folders which are synchronised with each other periodically, and it suggests that the synchronisation goes both ways - for instance, if a new file is created in either one of the two locations, it will be copied to the other at the next backup.
Does this clarify things?
Yes it does. Thank you!
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JudieKaren
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Mac Elite
Join Date: Nov 2001
Status:
Offline
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Originally posted by AWShuttleworth:
There tends to be a difference, yes.
"Clone" suggests a file-for-file backup of a folder or volume from one location to another.
"Mirror" generally applies only to folders which are synchronised with each other periodically, and it suggests that the synchronisation goes both ways - for instance, if a new file is created in either one of the two locations, it will be copied to the other at the next backup.
Does this clarify things?
Not quite.
Clone is really as it sounds -- a 100% copy of everything. You're "cloning" it. It's taken at a point in time.
Mirror is used in the context of RAID. Specifically, it refers to RAID 1. The two (or more than two) devices do not synchronize with each other... rather the operating system writes to all of them in parallel. EVERYTHING is written to both drives at the same time, so they have exact copies of everything on the other drive. If one drive blows up, you still have the other drive.
So cloning refers to copying, and mirroring refers to setting up a pair of drives as RAID 1. Synching is done by the OS, not by the drives (or by any other non-OS software). And RAID 1 is invisible to the end user.
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Clinically Insane
Join Date: Nov 1999
Status:
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A clone is a snapshot of a drive as it was at a specific point in time. It's useful for making backups.
A mirror is a snapshot of a drive which is continually updated. It's useful if you need high availability.
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You are in Soviet Russia. It is dark. Grue is likely to be eaten by YOU!
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