1. Cath O'Deray

    ZFS OpenZFS L2ARC on a budget

    In April last year, I began using low-end flash (USB thumb drives) as L2ARC for a notebook with 16 GB memory. Very pleasing. Yesterday, I got an older notebook with 4 GB memory. An opportunity to tell whether a similar approach will be worthwhile. Early observations, with the cache device...
  2. Cath O'Deray

    Solved OpenZFS: peculiarity with a labelled cache device and an unexpected label

    At some point in time, my pool named Transcend began using a device reference instead of the previously specified label – gpt/cache-transcend – for its one cache device. Question Now, is there any way for the pool to begin using the label without loss of content of L2ARC? I assume that either...
  3. acunha

    How to shrink the Boot disk to add L2ARC

    Hello! Happy and healthy 2021 to every and each one! This is my story: I've just built a FreeBSD machine to use primarly as a NFS/ZFS home server. CPU is a Pentium G4560 (7th gen), case NAS 800, MoBo mini-ITX, 32GB ECC mem and 5x 4TB HDD Toshiba N300. MoBo has only 6 SATA connections in...
  4. `Orum

    Solved 512B L2ARC with a 4K pool?

    I've been upgrading one of our old pools at work, going from 512B drives to 4K. However, I realized that I wanted to keep our SSD L2ARC, which reports 512B sectors (which I think it actually is). I also stumbled across an old thread that suggests that even if your L2ARC device is 512B, it...
  5. KDragon75

    ZFS FreeBSD ZFS L2ARC header size calculation

    I have been searching for some time and cannot find any official documentation on how to calculate the memory consumption for the L2ARC headers. I did find one person claiming that each header consumed 70 bytes and that each ZFS record required a header. C
  6. S

    Recommended RAM for L2Arc !!

    Hi, We're using FreeBSD server for video streaming site serving 200-4096MB size of each video. Server is built around 12 x 3TB SATA HDDs on HBA RAID-10 with 64GB DDR3 RAM. Recently we decided to add SSD as L2ARC device to cache video files and wanted to gather recommendations regarding how...
  7. N

    Solved ZFS configuration & cost effectiveness of it on PCs

    Edit: I realized I knew too little about ZFS when I wrote this. Sorry guys. Hello, I don't have a ECC memory so I don't want ZFS to use memory as ARC. I have a 256 GB M.2 PCIE SSD and 1 TB of HDD. And I will buy a 32 GB Optane module. And I have a SATA SSD 256 GB. How much for ZIL needed for...
  8. N

    Solved L2ARC is disabled. Why?

    I am stumped. I've been running a FreeBSD 9 server with ZFS for 5 years and have now done a completely fresh install of FreeBSD 11. Everything (meaning the pools layout) is configured as it was on the old system (as far as it was possible), but created from scratch. The problem that I face is...
  9. N

    Solved ZFS with SSD L2ARC

    Hello, I am building a PC currently. I want to use 1 HDD and 1 SSD as ZFS file-system. The problem is I don't know how to do it manually. I want to use SSD as cache to HDD. From what I've read I understand that I should use L2ARC partition on SSD. Is that correct? And where can I find how to...