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KKurgan reacted to bbgeek17's post in the thread [TUTORIAL] Understanding QCOW2 Risks with QEMU cache=none in Proxmox with
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Hi @Kurgan, Your question reminded me of another advantage of LVM: its volatile metadata doesn't reside in a user-land address space, so a process kill can't put it into a state that leads to data loss. Blockbridge : Ultra low latency... -
KKurgan replied to the thread [TUTORIAL] Understanding QCOW2 Risks with QEMU cache=none in Proxmox.Thank you very much for your answer and the time you spent researching it.
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KKurgan reacted to bbgeek17's post in the thread [TUTORIAL] Understanding QCOW2 Risks with QEMU cache=none in Proxmox with Like.
Hi @Kurgan, Based on a quick review, LVM-thin appears to offer better durability characteristics than QCOW2 for a few reasons: LVM-thin stores its metadata in a B-tree and applies updates transactionaly (though not via a traditional journal)...
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KKurgan reacted to bbgeek17's post in the thread [TUTORIAL] Understanding QCOW2 Risks with QEMU cache=none in Proxmox with Like.
Hi @Kurgan, Thanks for the great question. LVM is considerably more sophisticated than QEMU/QCOW, though I'm not an expert in its internal architecture. My assumption is that it uses a mix of demand-based and timer-based flushing. I'll try to...
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KKurgan replied to the thread [TUTORIAL] Understanding QCOW2 Risks with QEMU cache=none in Proxmox.Thanks a lot. I have read quite a lot of your website articles and while I'm not a Blockbridge customer and I'll probably never be (much smaller setup here) I have appreciated your KB articles a lot. But now a question has arisen: Is LVM-Thin...
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KKurgan reacted to bbgeek17's post in the thread [TUTORIAL] Understanding QCOW2 Risks with QEMU cache=none in Proxmox with Like.
Hey everyone, A few recent developments prompted us to examine QCOW2’s behavior and reliability characteristics more closely: 1. Community feedback There are various community discussions questioning the reliability of QCOW2. We have customers...