Openzfs draid12/29/2023 ![]() I would say that the results are very decent and consistent. The drive was attached over USB 3.0 port so there was not 35 MB/s limitation from USB 2.0 port. Each line means average of 10 minutes (600 seconds). I expected quite slow operation but even with the enabled zstd compression and AES-XTS 256bit GELI encryption I got pretty decent results. Of course I do not write all these options by hand – I just a script wrapper for that – rsync-delete.sh – available on my scripts page.Īs I started to copy files on the drive I watched the write speeds using iostat(8) and zpool-iostat(8) tools. progress -no-whole-file -numeric-ids -delete \ % rsync -modify-window=1 -l -t -r -D -v -S -H -force \ These are the arguments I use for my rsync(1) jobs. I needed to copy little more then 3 TB of data there. I recently tried ZFS on top of GELI encrypted partition on a 5 TB external USB SMR drive. ZFS tries to pack as much random I/O into sequential with its ZFS features – described in detail in the zpool-features(7) man page for example. How ZFS behaves on SMR drives? Very well I would say. ![]() Silent Fanless FreeBSD Server – Redundant Backup.Silent Fanless FreeBSD Server – DIY Backup.Here are mine backup solutions based on the SMR drives: I personally use SMR drives for my backup solutions. Especially heavy and random I/O writes are ‘problematic’ and slower on SMR drives … but it does not mean they are useless.įor the backup or clone purposes they are more then enough. Writes are little ‘crippled’ comparing to PMR drives. As you can compare the below ‘size’ of the taken place the same data on SMR disk takes less physical space then on traditional PMR drives. I marked the filled blocks on both disks with xxx marks. I will try to visualize this difference below using my favorite Enterprise Architect ASCII Edition software. In SMR disks data tracks are written to overlap part of previously written track – this results in narrower tracks and higher density. Hard disk drive manufacturers – to pack even more data into the same size platters – also offer SMR disks. These are PMR disks (Perpendicular Magnetic Recording). Traditional disk drives have non overlapping magnetic tracks parallel to each other. From home or desktop/laptop solutions to enterprise offerings. The ZFS filesystem (more often called OpenZFS lately – as the project name) is a great filesystem for many purposes.
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