Date: Sat, 06 Feb 2021 17:33:03 +0100 From: Walter von Entferndt <walter.von.entferndt@posteo.net> To: Abner Gershon <6731955@gmail.com> Cc: freebsd-geom@freebsd.org Subject: Re: gjournal, turn off automatic synchronization clarification Message-ID: <2023081.RhTPgMbj8J@t450s.local.lan> In-Reply-To: <mailman.63.1612612801.46298.freebsd-geom@freebsd.org> References: <mailman.63.1612612801.46298.freebsd-geom@freebsd.org>
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At Samstag, 6. Februar 2021, 13:00:01 CET Abner Gershon <6731955@gmail.com> wrote: > Appreciate your advice. There seems to be overwhelming enthusiasm for > ZFS. This enthusiasm is justified. ZFS offers many advantages for your setup. > 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? You can use find(1) & cpio(1)'s -0 option to use zero-terminated filenames. > 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. Adjust the appropiate sysctl(8) knobs to restrict ZFS ARC cache size. ZFS dedup & cloning features are especially useful when working with jails and VMs. For Linux guests you don't need a VM anymore, Linux- branded jails are now in STABLE, i.e. about to come latest with 13-REL. Maybe they are already in 12.2, I don't know. > 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 understand that walking over the street when the traffic lights show red is dangerous. But I never had an accident for over 40 years doing that... > 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. Use 3+-way mirrors or RAID with double/triple parity on disks >8 TB. The reason is that on such large disks, the likelyhood of unrecoverable & undetected bit errors is astonishingly high. Without a checksum, these are undetected. ZFS offers strong checksums from platter to applications memory. -- =|o) "Stell' Dir vor es geht und keiner kriegt's hin." (Wolfgang Neuss)
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