Re: [Avid-L2] OTish: Is it Mandatory to run Mojave 10_14_6 on an APFS Volume?

That's an interesting article.  I guess file enumeration is playing a big roll.  I had found saving and replacing a very simple textedit file of a paragraph or two of text would give me a spinning beach ball for close two 10 seconds before saving the new file replacing the old one of the same name.  Now I've CCC'd back to the internal drive formatted Mac OS Extended Journaled still running mojave and it saves and replaces immediately.  I learned in the article there was some form of deframentation in the mojave OS but it's off by default.  "

Can't APFS defragmentation help with this?

Apple quietly added a defragmentation feature to APFS in macOS Mojave. APFS defragmentation is disabled by default, and only lightly documented in the diskutil man page. Apple gives no indication of what this defragmentation feature actually does, in particular whether it defragments filesystem structures. Based on the results of the tests above, however, I would conclude that APFS defragmentation does not cause filesystem metadata to be physically clumped together on the disk."

Now that I have the OS on a HFS+ drive I don't know if it would defrag any files that have been fragmented by the APFS architecture.  Time for more googling.  

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Re: [Avid-L2] OTish: Is it Mandatory to run Mojave 10_14_6 on an APFS Volume?

This doesn't answer your question but it's an interesting blog post written by the author of Carbon Copy Cloner

https://bombich.com/blog/2019/09/12/analysis-apfs-enumeration-performance-on-rotational-hard-drives

On Mon, Jan 17, 2022 at 1:02 AM John Moore <bigfish@pacbell.net> wrote:

My understanding is the Apple APFS drive format is designed to optimize performance on SSD media.  It will update files with just the changes and pointers so the entire file doesn't have to be re-written.  Over time this will lead to file fragmentation which isn't much of an issue on an SSD but can be for a spinning drive.  I have an old iMac that I installed Mojave on a while back and it seems to have been slowing down performance wise.

I've carbon copy cloned the internal startup drive to an external spinning drive partition that is Mac OS Extended journaled.  I thought maybe by bouncing out and back it would in essence defrag the internal drive but it still seemed slow.  I've now reformatted the internal from APFS back to Mac OS Extended journaled and I'm re=carbon cloning the archived drive back on to the internal in the old drive format. 

Does anybody know if my theory that CCC'ing the APFS internal startup drive out to an external partition will defrag what the APFS process does to break up files to avoid rewriting them completely?  I'm thinking is CCC will clone back to the now Mac OS Extended journaled internal drive from here on out the fragmentation generated by APFS format will stop or be alleviated.  It's  an old computer but it seemed to slow a lot when I went up to Mojave in a progressive way just like I would expect fragmentation to manifest.

John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net

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[Avid-L2] OTish: Is it Mandatory to run Mojave 10_14_6 on an APFS Volume?

My understanding is the Apple APFS drive format is designed to optimize performance on SSD media.  It will update files with just the changes and pointers so the entire file doesn't have to be re-written.  Over time this will lead to file fragmentation which isn't much of an issue on an SSD but can be for a spinning drive.  I have an old iMac that I installed Mojave on a while back and it seems to have been slowing down performance wise.

I've carbon copy cloned the internal startup drive to an external spinning drive partition that is Mac OS Extended journaled.  I thought maybe by bouncing out and back it would in essence defrag the internal drive but it still seemed slow.  I've now reformatted the internal from APFS back to Mac OS Extended journaled and I'm re=carbon cloning the archived drive back on to the internal in the old drive format. 

Does anybody know if my theory that CCC'ing the APFS internal startup drive out to an external partition will defrag what the APFS process does to break up files to avoid rewriting them completely?  I'm thinking is CCC will clone back to the now Mac OS Extended journaled internal drive from here on out the fragmentation generated by APFS format will stop or be alleviated.  It's  an old computer but it seemed to slow a lot when I went up to Mojave in a progressive way just like I would expect fragmentation to manifest.

John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net