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Forum Discussion
Rsync impact on disks?
Hi,
I have a Readynas and an iMac. I'm new to the Mac world however my question is more general than mac-specific. My intention is to synchronise "Media" files (photos, movies etc.) between my iMac and the Readynas. I thought that rsync may be the best way to do this however I'm concerned about disk usage, specifically the solid state disk internal to the iMac. Does rsync have to examine every single file to compare both source and target locations? I thought perhaps there may be a way that the OS advises changed files. In practical terms would a regular rsync execution lead to undue wear on drives on both the iMac and the NAS?
Thanks
Silverous
I have a Readynas and an iMac. I'm new to the Mac world however my question is more general than mac-specific. My intention is to synchronise "Media" files (photos, movies etc.) between my iMac and the Readynas. I thought that rsync may be the best way to do this however I'm concerned about disk usage, specifically the solid state disk internal to the iMac. Does rsync have to examine every single file to compare both source and target locations? I thought perhaps there may be a way that the OS advises changed files. In practical terms would a regular rsync execution lead to undue wear on drives on both the iMac and the NAS?
Thanks
Silverous
3 Replies
- Normally you would use rsync incrementally. Then it looks at the file name, size, and modification date in the directory of both systems. If a file's size and timestamp don't match (or if the file is new), then the file is copied. Otherwise it is ignored.
Also, note that SSD wear only occurs when writing to your Mac. Reads on the SSD are not a concern. StephenB wrote: Normally you would use rsync incrementally. Then it looks at the file name, size, and modification date in the directory of both systems. If a file's size and timestamp don't match (or if the file is new), then the file is copied. Otherwise it is ignored.
Also, note that SSD wear only occurs when writing to your Mac. Reads on the SSD are not a concern.
Excellent, thank you. In terms of looking at the file name, size and modification date I presume that means it isn't looked at the actual data but just the "index" to the data.- Correct. That info is all in the directory (what you are calling the index)
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