background So while planning my data layout I came across the realisation that these 2 datasets inherit their recordsize from the root dataset which for me is currently set at 128KiB. .truenas_containers ix-apps (and this does not seem a period) So these are my thoughts So for app and contai…

I have posted a feature request here [image] Apps and Containers do not have their `recordsize` optimized or the ability to change it Feature Requests background So while planning my data layout I came across the realisation that these 2 datasets inherit their…

if you do not use hostpaths then all the writes for apps go into ix-apps an I assume containers are not all write only. Apps will have small writes to databases, configs. A lot of apps are web-based and will accept very small PHP POSTs with things like How to Use AdventureLog | AdventureLog Cont…

[image] shoulders: Containers are by their very nature a large collection of small files. You realise that recordsize is a maximum value, not a minimum or a fixed size, right?

can a single block hold more than one file ?

[image] shoulders: I will have a mix of VMs, Apps and media on the one pool. Not familiar with SCALE/CE. Are the VM images placed under “.truenas_containers” or “.ix-apps”? What about “ix-virt”? I thought that the user is meant to create or specify the volume or image to use, which will be it…

V26 containers are in .truenas_containers

[image] shoulders: can a single block hold more than one file ? It’s a moot point because of this: [image] winnielinnie: Even if those datasets were configured with a 16-MiB recordsize, an incompressible 4-KiB file will only consume 4-KiB on the disk. An imcompressible 3.25-MiB file will…

I thought the dataset record size denotes the block size that was read and written for each I/o operation

I thought I bookmarked it. I laid out the layman’s explanation of recordsizes and blocks. I will try to find it. EDIT: Found it.

What is the point in the record size? Does zfs not read and write in these 128k blocks rather than variable sizes. Does Zfs uses the recordsize to calculate checksums? A lot of tutorial say to tune your recordsize to match that datasets purpose. I am confused :confused:

`ix-apps` and `.truenas_containers` are system and hidden, how should i configure the recordsize

Apps and Virtualization

shoulders September 3, 2026, 12:56pm 22

I have posted a feature request here

Topic		Replies	Views
Apps and Containers do not have their `recordsize` optimized or the ability to change it Feature Requests	18	107	September 4, 2026
I need some recommendations for my setup - Looking to improve TrueNAS General	9	85	September 3, 2026
Script to set best dataset record size TrueNAS General	4	1022	November 13, 2024
Best Practise - dataset configuration for PHOTO and IMAGE files TrueNAS General	7	1240	May 11, 2024
Pool replace/expand and Record Size Change with Decreased Capacity TrueNAS General ZFS	10	499	July 10, 2024

`ix-apps` and `.truenas_containers` are system and hidden, how should i configure the recordsize

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