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l2arc

  1. S

    A bit about SSD perfomance and Optane SSDs, when you're plannng your next SSD....

    NOTE: I'll be referring in this page, to a type of SSD developed by Intel and Micron, called 3D X-Point (pronounced "crosspoint"). It's most widely sold as Intel's Optane. The Optane devices I mean are things like the 900p, 905p, and P48xx. First generation optane, and some smaller ones...
  2. H

    Cache Drives

    Hello, i'm in the process of finalizing my FreeNAS build that I plan to use for my VMWare lab, I want to make sure I have a well rounded platform that covers my needs and I was wondering if I would benefit from adding a cache drive to my pool. Here is my current build: PowerEdge R710 (2)...
  3. Heracles

    SLOG or L2ARC first for iSCSI and which SSD

    Hi, Recently, I bought a used server (R820 ; 32 Core ; 256G RAM) as an upgrade for my ESXi server. Thanks to that, I moved my main FreeNAS from its T-130 to the T-330 I freed. The 8 drives are paired in 4 mirrors and a single pool. The server is maxed out on RAM (64G) and there is only a last...
  4. Kevin Horton

    L2ARC device recommendation?

    I'm pondering adding an SSD for L2ARC dedicated to metadata to hopefully speed up rsync. I use rsync to back up to two different pairs of striped disks for offsite backup (I also have two automatically replicated RAIDZ2 onsite backups). The data is mostly static, and rsync takes many hours to...
  5. Borja Marcos

    Scrub/resilver prefetch and l2arc performance problems

    Hi, I posted this to freebsd-fs but I imagine it's of interest here as well. On one of my systems I noticed a severe performance hit for scrubs since the sequential scrub/resilver was introduced. Digging into the issue I found out that the system was stressing the l2arc severely during the...
  6. woyteck

    Slow reads from PCIe L2ARC

    I have a problem with my L2ARC. It seems to have reads capped at ~175MB/s. Why am I bothered? - Well, it's a 2TB Intel SSD - P3520, PCIe based NVMe drive. When testing reads directly from /dev/nvd0, I easily and consistently get aroung 600MB/s # dd if=/dev/nvd0 of=/dev/null bs=128k...
  7. S

    Explanation of ARC hit graphs?

    My understanding is reads can be served from either: RAM - ARC hit SSD - L2ARC hit General disks I would NOT expect a read to be serviced by BOTH ARC and L2ARC, yet my graphs are showing ARC and L2ARC hit ratios, that when combined, far exceed 100%. How is this possible? I thought one could...
  8. hetz

    ZFS and Intel 900P

    Hi, I've seen some discussions about the Intel 900P and ZFS and I didn't understand something: Yes, it could be a great SLOG, but most of the time, SLOG only uses few gigabytes, and the smallest 900P is 280GB, so if I buy this card, should I partition it for Slog 10GB (for example) and L2ARC...
  9. averyfreeman

    Recommendations for 480GB NVMe SLOG / L2ARC config

    480GB Samsung SM953 NVMe SSD with PLP: Just picked up this beaut today, it's an enterprise NVMe SSD with power loss protection. Check out the pics, you can see the honkin' capacitors on the front and back. I was thinking of partitioning it and using somewhere between 8-24GB for the SLOG and...
  10. T

    When to use L2ARC and what to use

    Hi I have 2 FreeNAS servers running FreeNAS 11-U4. One is based on the Supermicro X10DRi-T and the other on Supermicro X9DRW-iF. Both have 256 GB RAM. The X9DRW-iF server has a JBOD chassis with 45 x 4 TB disks zpooled into 22 vdevs with 2 disks and a LSI 9207-8e. Question 1: Does it make...
  11. gusgus

    SOLVED L2ARC size is >1TB? Also poor performance.

    About a year ago I noticed a drop in my SMB share performance. If I recall accurately, at the time I didn't think much about it as I had just updated FreeNAS to the latest release (I think it was a minor release update, like 9.10-Ux to 9.10-Uy, but I'm not sure). I had assumed that the L2ARC...
  12. D

    Mirror & stripe 2 disks at the same time?

    Hey I'm going over this guis blog https://pthree.org/2012/12/07/zfs-administration-part-iv-the-adjustable-replacement-cache/ Pretty great read and I was wondering, at the end of this post he shows that he has a 2 OCZ ssds in both mirror and stripe? - or do I read it incorrectly? pool...
  13. E

    zfs send/receive and ARC/L2ARC

    I'm building a system with two backup servers (A and B). I'll have 10+ hosts pushing datasets to backup A via zfs send. Backup A will then push all of those datasets to backup B using zfs send. My question is - will backup A write everything that it receives via zfs receive into the...
  14. R

    Pool lost performance

    Hi All, I have a system running that is exporting the pool/datasets using NFS to some ESXi server, sinds about 3 weeks my pool has lost all possible perfomance, an i would like to know why, i have been looking at all the numbers of my system but am unable to point to the real reason in this...
  15. H

    L2ARC & Cache for shared ESXi SAN

    Hello Everyone, I am currently in the process of implementing a new ESXi shared SAN in my home for provisioning and running VM's from. This new SAN will be created on an HP DL360e Gen8 1U server, with 4x 3.5 inch hot swap bays (two SATA 6.0 and two SATA 3.0 Gbps ports). The drives to be used...
  16. K

    Verschlüsseltes ZFS mit L2ARC SSD

    Hi, ich habe meinem Pool eine L2ARC SSD spendiert, allerdings ist mir aufgefallen das nach einem Neustart der Pool anschließend automatisch entschlüsselt ist. Dem war vorher (ohne L2ARC) nicht so, kann man L2ARC beim Neustart löschen lassen bzw. bin ich überhaupt richtig in der Annahme das es...
  17. SwisherSweet

    Should I dedupe on my setup?

    I have finally gotten all my parts to built a Mac Pro FreeNAS server. The basic hardware is: Mac Pro with 2 x 6 Core Xeon "Westmere" 3.46GHz processors 64GB ECC 1,333MHz RAM 6 x 3 TB Toshiba P300 drives 120GB SSD Boot Drive (can't boot FreeNAS from USB on Mac) I have a wildcard component that...
  18. Deprecated

    SOLVED Report showing much more L2ARC cache usage than cache drive

    Hello All, I noticed this afternoon that the ZFS Report is showing much higher L2ARC cache usage than the size of the cache SSD I installed. ZFS Report: Volume Status: Disks: Is this normal or have I set something up incorrectly? Hardware is listed in signature. _______________________...
  19. R

    Konfiguration meines Pools für VDI

    Hallo Zusammen, ich beschäftige mich in Form eines Projekts mit Storage für eine kleine VDI. Mein Pool beinhaltet 8x 1TB HDDs und bis zu 6 SSDs. Ich habe meinen Pool so konfiguriert dass ich 4 512Gb EVO SSDs als L2Arc nehme und 2 512GB EVO SSDs als ZIL. Mag vielleicht erstmal oversized sein...
  20. N

    Proposed Build - First time FreeNAS

    Hi Guys - Long time lurker, first time poster. Anyways looking to upgrade my NAS setup and figured I would go with ZFS and FreeNAS. Been using a Synology 1812+ for the past 5 years. Hardware RAID5/6 on Areca Controller and CentOS before that. This time I want to go with ZFS for its increased...
  21. H

    All SSD vdev OR SSD L2ARC & Cache for shared ESXi SAN

    Hello Everyone, First off I want to say that I’ve long browsed the online forums for help and ideas on setting up a FreeNAS system and figured it’s now time for me to join in on the discussions and gain some knowledge. I’m fairly new to FreeNAS, but look forward to learning what its full...
  22. X

    ZIL und L2ARC für meine Konfigutration sinnvoll?

    Hallo! Ich experimentiere gerade mit FreeNAS und will es demnächst als Produktivsystem (privat) einsetzen. Folgende Konstellation ist geplant: MB: Supermicro X11SSL CPU: Xeon E3-1240v6 RAM: 16GB ECC-RAM (wird erweitert auf 32GB) System: ESXi 6.5 auf USB-Stick Fespl.: 7x WD Red 3TB für Daten...
  23. M

    Strange issue with l2arc

    Hi all! I'm experiencing a strange issue with l2arc that began after the 9.10.2 update. I was wondering if anyone else had experienced the same. Basically after a few days of running, FreeNAS suddenly thinks that 700GiB of l2arc has magically transformed into 32EiB (Exabytes!!!) of l2arc. Then...
  24. A

    CRITICAL: Device: /dev/ada3, ATA error count increased from 0 to 1

    Hi, I got this error on my freenas (CRITICAL: Device: /dev/ada3, ATA error count increased from 0 to 1), ada3 is my L2ARC drive, so I'm not super worried, I just wanted to know if anyone has some insight as to why this is happening. If you have any advice or words of caution I'd appreciate it...
  25. tbaror

    Using SSD 960 PRO NVMe M.2 as cache/slog

    Hello All, Anyone ever used SSD 960 PRO NVMe M.2 for cache L2ARC/ZILL drive, and if it would be a good choice? Thanks
  26. R

    Smaller than expected L2ARC Size - same hardware, different L2ARC size

    Why does the L2ARC report different sizes on different machines with the same hardware after a reboot? How can I deteremine the root cause? I have two almost, nearly, quite possibly identical hardware boxes (lets just say that i haven't compared BIOS Settings).... and the L2ARC in one is...
  27. S

    Decided on the majority of my spec, now I need to make choices about SLOG and L2ARC

    I'm putting together a new FreeNAS build. The main hardware issue left is SLOG/L2ARC to get the best chance of good performance/reliability. Hardware - Xeon E5-1620 v3 (4 core, 3.5 GHz+ as I might heavily use CIFS or other single-thread services) 32GB RDIMM 2400 (Amazon have an insanely good...
  28. A

    Configuring L2ARC to only cache certain directories

    In configuring my hypothetical server, I have a few questions about the ARC/L2ARC. Our use-case is a little odd. We have a directory full of many small files, new batches of which are generated at the beginning of every month. When doing data analysis, we want to be able to access this month's...
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