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Comment on Proxmox Disk Performance Problems

SeeJayEmm@lemmy.procrastinati.org ⁨6⁩ ⁨months⁩ ago

Proxmox is using ZFS. Opnsense is using UFS. Regarding the record size I assume you’re referring to the same thing this comment is?

You can always find some settings in your opnsense vm to migrate log files to tmpfs which places them in memory.

I’ll look into this.

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pyrosis@lemmy.world ⁨6⁩ ⁨months⁩ ago
I’m specifically referencing this little bit of info for optimizing zfs for various situations.

Vms for example should exist in their own dataset with a tuned record size of 64k

Media should exist in its own with a tuned record size of 1mb

lz4 is quick and should always be enabled. It will also work efficiently with larger record sizes.

Anyway all the little things add up with zfs. When you have an underlying zfs you can get away with more simple and performant filesystems on zvols or qcow2. XFS, UFS, EXT4 all work well with 64k record sizes from the underlying zfs dataset/zvol.

Btw it doesn’t change immediately on existing data if you just change the option on a dataset. You have to move the data out then back in for it to have the new record size.

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- SeeJayEmm@lemmy.procrastinati.org ⁨6⁩ ⁨months⁩ ago
  That cheat sheet is getting bookmarked. Thanks.
  
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  - pyrosis@lemmy.world ⁨6⁩ ⁨months⁩ ago
    You are very welcome :)
    
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- SeeJayEmm@lemmy.procrastinati.org ⁨6⁩ ⁨months⁩ ago
  
  Media should exist in its own with a tuned record size of 1mb
  
  Should the vm storage block size also be set to 1MB or just the ZFS record size?
  
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  - pyrosis@lemmy.world ⁨6⁩ ⁨months⁩ ago
    most filesystems as mentioned in the guide that exist within qcow2, zvols, even raws, that live on a zfs dataset would benefit form a zfs recordsize of 64k. By default the recordsize will be 128k.
    
    I would never utilize 1mb for any dataset that had vm disks inside it.
    
    I would create a new dataset for media off the pool and set a recordsize of 1mb. You can only really get away with this if you have media files directly inside this dataset. So pics, music, videos.
    
    The cool thing is you can set these options on an individual dataset basis. so one dataset can have one recordsize and another dataset can have another.
    
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