questions regarding -c option to gjournal label

[Abner Gershon]

By way of intro I am new to freebsd and am in the process of setting up a
small office server. I am leaning toward UFS with gjournal rather than ZFS
and would like to make UFS as stable as possible and obtain the best
possible data integrity.

The man page states, " *-c* Checksum journal records."

My questions are:
1. What are the journal records checksummed against? eg checked against
kernel cache? data provider record?
2. Is this an ongoing process for the duration of the journal or a one time
event?
3. What happens if checksum does not match?

Thanks in advance.

-Abner
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gjournal, turn off automatic synchronization clarification

[Abner Gershon]

Man page quote:"

  When *gjournal* is configured on top of gmirror(8)

or graid3(8) 

providers,
 it also keeps them in a consistent state, thus automatic synchronization
 on power failure or system crash may be disabled on those providers."


I am planning to use 4 disks. 2 in a gmirror for data. 2 disks with
mirrored partitions for the journal.

Should I turn off gmirror auto sync for just the data provider, just
the journal provider, or for the journaled device itself?

Please provide example.

Thank you.
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Re: gjournal, turn off automatic synchronization clarification

[Juan Manuel Palacios]

Hopefully I'm not out of line here, specially with me being far from a GEOM
expert… but from all that you're saying, and all that you're hoping to get
from your storage solution, I'm wondering why you're learning against ZFS,
since it pretty much gives you all you want right out of the box.

If I may ask, what are your reasons for rejecting ZFS? What constraints do
you anticipate you'll be facing, e.g. low RAM?

On Fri, Feb 5, 2021 at 3:00 PM Abner Gershon <6731...@gmail.com> wrote:

> Man page quote:"
>
>   When *gjournal* is configured on top of gmirror(8)
> <
> https://www.freebsd.org/cgi/man.cgi?query=gmirror&sektion=8&apropos=0&manpath=FreeBSD+12.2-RELEASE+and+Ports
> >
> or graid3(8) <
> https://www.freebsd.org/cgi/man.cgi?query=graid3&sektion=8&apropos=0&manpath=FreeBSD+12.2-RELEASE+and+Ports
> >
> providers,
>  it also keeps them in a consistent state, thus automatic
> synchronization
>  on power failure or system crash may be disabled on those providers."
>
>
> I am planning to use 4 disks. 2 in a gmirror for data. 2 disks with
> mirrored partitions for the journal.
>
> Should I turn off gmirror auto sync for just the data provider, just
> the journal provider, or for the journaled device itself?
>
> Please provide example.
>
> Thank you.
> ___
> freebsd-geom@freebsd.org mailing list
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>
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[no subject]

[Abner Gershon]

In response to @Juan Manuel Palacios:

Appreciate your advice. There seems to be overwhelming enthusiasm for ZFS.
Maybe I am swimming against the current leaning toward UFS. My reasons are:
1. Have relied on dump backups to LTO tape for the past decade and am very
comfortable with dump and restore. Sure, tar would not be hard to learn but
will it reliably handle the samba files with names like "Bob's ideas about
marketing.doc" correctly?
2. I have 72 GB ram but am planning to run a Windows guest and Linux guest
with Oracle database on behyve as well as a few jails. Concerned ZFS will
eat up too much memory.
3. Not really convinced that "bit-rot" should be a concern. I understand it
is real. But, in the past 15 years I can't recall coming across a single
corrupted data (pdf, word doc, ledger, mp3, etc) file. I currently manage
about 4TB of data and it grows by about 500 or 600 GB per year. Have been
using ext3 and ext4 on debian linux for the past 15 years.
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