The docs only says this: "gjournal only supports UFS2". It does not
specifically say that you cannot have per-slice journaling. However,
since you could have other filesystems on your slice, I bet that slice
based journaling is not supported.
So how do I achieve per-slice journaling instead of per-partition?
I thought I read somewhere that because gjournal is block based and not
really part of the filesystem, that it could easily be extended for any
other filesystem. My imagination said that gjournal was probably
therefore only temporarily limited to a slice full of UFS partitions.
Anyone know for sure?
gjournal needs to know what what data is actually metadata. In case of
UFS the -J flag given to newfs tells system that using this fs we should
mark metadata for gjournal use.
Another tricky question: why would you journal a SWAP partition?
Well, I don't really want to, but how big does a partition like /var
have to be before it's no longer ill-advised to journal it individually?
A fair bit of writing can occur in /var and the scenario my server will
occupy has me concerned about inglorious shutdowns.
What are the actual reasons for why journaling a small partition is
considered a bad idea?
Journal needs to bee big enough to amass all modifications. By default
it's 1G. Just compare this to the size of your /var.
Sphinx of black quartz judge my vow.
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