IsThisThingOn's latest activity

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    IsThisThingOn replied to the thread NAS UGreen DXP4800 Plus.
    Ich vermute du hast write amplification wie Sau ;) Nee aber mal ernsthaft, du hast ext4 VMs deren QEMU2 disks auf einen NFS share sind und dieses NFS share nutzt ZFS? Stimme euch beiden zu. Ich vermute mal OP aber ist Storage wichtiger, weil...
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    IsThisThingOn replied to the thread NAS UGreen DXP4800 Plus.
    TrueNAS drauf und los :) Entgegen meines Vorposters finde ich da Storage wichtiger und das bisschen Hypervisor kann auch TrueNAS. Man könnte auch keine grossen VM disks haben, weil die VMs selbst auf einen NFS share zugreifen und darum selber...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    Another great explanation of that topic: https://forums.truenas.com/t/understanding-openzfs-capacity/2444 It even has a picture of a 7 wide RAIDZ2 with 128k. Not exactly your 8 wide, but pretty close: See the two X sectors? That is 8k padding...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    BTW, that calculator has an interesting note regarding the zfs list command you used: Maybe this is what screwed your tests? I honestly have no idea. Here is another, IMHO even better calculator. And if you scroll down all the way to the...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    No, that is not an actual real-world result, considering how complicated free space reporting is in ZFS. That is: wer misst, misst Mist A real world test would be you setting up a 4 wide RAIDZ1 vdev with 1TB HDDs, create a 16k zvol with...
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    IsThisThingOn replied to the thread NAS UGreen DXP4800 Plus.
    Verstehe nicht ganz deine Frage, noch dein Setup. Ich kann nur sagen, irgendeine Form von Disk, in Form einer Datei (zum Beispiel QCOW2 oder VDI) zu verwenden, und diese Datei/Disk dann auf ein NFS share zu legen, und dieser NFS share hat dann...
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    IsThisThingOn reacted to uwka77's post in the thread NAS UGreen DXP4800 Plus with Like Like.
    @Falk R., @Bu66as Das kann ich nur bestätigen. Unter VMware gibt es kaum Unterschiede in der Disk-Performance zwischen NFS und iSCSI.
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    Just for fun, we can do the math for your setup and what you should get with 128k. Let's look at a 132k write. First block is an incompressible 128k write. Second is also a 128k block but with only 4k data, the rest zeros. LZ4 can compress that...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    That question is an oversimplification ;) But most likely, it would rise of course. Since a lets say from 128k down to 100k compressed block can make use of wider stripes and easier fit the pool geometry, padding has less impact and so on. But...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    This is another big trap. I already explained that one: So no you are correct, of course won't see 96TByte for your 8 wide 18TB RAIDZ2. You will see 6*18=108TB as your rightfully said so far we agree. But if you create a zvol with the 16k...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    That is correct, it is a oversimplification. But it does not get that much better if the data actually is compressible. What if a 16 block can be compressed to 4k? Then you have one padding & one data = 50% efficiency. Congrats you are now down...
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    IsThisThingOn reacted to Bu66as's post in the thread NAS UGreen DXP4800 Plus with Like Like.
    @IsThisThingOn, du triffst den Nagel auf den Kopf. Das ist der klassische "Perfect Storm": Der Windows-NFS-Client ist per se ineffizient (Locking/Sync), und das dann kombiniert mit VM-Disk-Images auf einem ZFS-Dataset (CoW-on-CoW) potenziert die...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    That is not what it does. I unrealistically assumes that a 16k volblock is not compressable and because of that always a 16k write. It does not assume every write to be a tiny 4k block. It assumes a 4k sector size. I did not know about that. Do...
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    Sorry, I misunderstood. In that case you can leave it. Sure. So Proxmox uses the good default of 16k volblocksize. That means that all your VMs ZFS raw disks, are offered 16k blocks. Now lets look how ZFS provides 16k blocks. You have RAIDZ1...
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    IsThisThingOn replied to the thread NAS UGreen DXP4800 Plus.
    Ich kenne mich null aus mit VMWare. Aber verstehe ich das richtig, dass du unter VMware eine disk ähnlich wie QEMU2 inter Proxmox erstellst und diese dann auf den NFS share von TrueNAS schiebst? Das kann fast nur in die Hose gehen. Ausser du...
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    IsThisThingOn reacted to Falk R.'s post in the thread NAS UGreen DXP4800 Plus with Like Like.
    Wenn ich das richtig verstehe, greifst du mit Windows per NFS zu. Das ist immer langsam, da der Windows NFS Client nicht so doll ist. Bitte mal mit Linux oder direkt mit Proxmox testen.
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    IsThisThingOn replied to the thread ZFS storage is very full, we would like to increase the space but....
    I would recommend you to do - Backup the VMs - Backup your Proxmox settings - destroy, reinstall Proxmox - use mirrors! - reimport the VMs I would not use 5 drives as a RAIDZ1. With the default of 16k volblocksize you only get 66% and not your...
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    IsThisThingOn replied to the thread NAS UGreen DXP4800 Plus.
    Das ist definitiv seltsam uns sollte nicht sein. Von welchem Client aus ist das? Du hast aber hoffentlich nicht dedup am laufen? Klar, sync ausschalten macht auch nur sync writes schneller, weil du den client belügst. Lass besser die Finger...
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    IsThisThingOn reacted to JeanL's post in the thread PBS testimonial (hardware requirements are a joke) with Like Like.
    Hi, For deduplication YMMV, for example, if I look at our PBS, it's pretty good with more than 90% of Linux VMs (more than 60% of these Linux machines are Debian), and retention from 14 to 365 days. We have critical VMs which backups run every...
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    IsThisThingOn reacted to UdoB's post in the thread PBS testimonial (hardware requirements are a joke) with Like Like.
    Obviously that depends on the modified data per interval and the "prune"-settings. And it needs a number of backups present to work at all :-) Both my dayjobs cluster and my homelab show around 30 - with basically "everything daily". If I would...
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