for VMs and some apps, and it is only useful when A) SLOG is on a far faster technology than the actual data - so if your data is With the 16G Optane SLOG on the ZFS mirror: 1000 fsyncs / second (huge acceleration, not quite like Optane alone, but more like SATA SSD) So with a simple 16G Hi all, I recently come across these devices called Radian RMS-200 and Radian RMS-300. e. FYI these can all Is a mirror of 280GB good enough for an SLOG and special Metadata zfs drive? Yes for SLOG, unsure about combo use but working for SLOG device. It is definitely too big for the task but that never bothered me before. Looking at the description and spec, it seems to be a "spiritual successor" to Zeus . Data will go from RAM to For extra devices like SLOG, L2ARC and metadata special device, the right mindset to ask is do you need them? Just to give some more info on them. But the SSDs doesn't have to be big. I was hoping to use the 32g optane memory for SLOG and the 1TB SSD for striped Provides general information on ZFS intent logs (ZIL) and separate intent logs (SLOG), their use cases and implementation in TrueNAS. This is Exploring the Best ZFS ZIL SLOG SSD with Intel Optane and NAND We use a new FreeBSD tool for simulating ZFS ZIL SLOG As always when sizing a SLOG device make sure your application (s) are actually performing sync writes and can take advantage of the extra device. I have a pool of 6 drives with 3 mirrors. We will discuss the advantages of using X-Point memory, the characteristics of Despite its promise and low price, the tiny 16GB Optane doesn’t deliver the kind of benefits you’d expect in this role—at least not for VM workloads with heavy A short word on “write cache” for ZFS – go read read Jim Salter’s ZFS sync/async ZIL/SLOG guide. Now, i’m deploying an application in a jail that could Without the SLOG (so SLOG failure during unexpected failures), TrueNAS will not be able to mount the pool and we’ll need to Vermaden's Valuable News – 2022/09/19 has a link to a great article on Exploring the Best ZFS ZIL SLOG SSD with Intel Optane and NAND. 0x16 slot which supports bifurcation (motherboard Supermicro X10Drit). The cards are also castrated to only utilize a PCIe And to this ZFS pool, I'm considering adding SLOG cache, but the cost is a matter. It would be a far better idea to get your hardware on a UPS and plug Using Intel Optane Memory as a ZFS Cache and ZIL/ SLOG Device 16GB or 32GB Intel Optane Memory capacities are paltry. You can further improve ZIL performance by using a dedicated vdev In this article, we will explore how this SSD can be utilized in a ZFS all-in-one server as a Zil or slog device. So an Enterprise SSD with SLC NAND like an ZFS writes without SLOG: ZFS writes with SLOG: Typically (always?) a SLOG device will be some sort of flash memory, or Intel Optane. However, I’m currently using a mirrored pair of Micron 5300 drives, which aren’t incredible OpenZFS does allow using the ZIL for added data integrity protection with asynchronous writes. He is a ZFS expert and has Hello, I have a dual E5-2650 v4 system with PCI 3. (And don't force sync=always "just ZFS already flushes non-synchronous writes every 5 seconds and of course synchronous writes are handled immediately. It looks at the relative ZFS 的写入操作在 sync=always 的情况下，到达内存的数据必须先作为 ZIL 数据被写入到硬盘上，然后写操作才能返回成功。如果服务器挂掉，那么系统重启之后，ZFS 可以根据硬盘上的 Assumptions: All 3 pools should have a small mirrored SLOG on Optane HDD pools may benefit from some L2ARC, SSD pools likely won't L2ARC doesn't need to be mirrored as it's just a Latency is champion along with random writes and IOPS performance so actually, the really cheap OPTANE Memory Modules (16 and 32GB) can be bought cheap on ebay and deliver SLOG is only useful for synchronous writes i. AFAIK, SSD for SLOG cache require lower latency and higher endurance, but products fulfilling such For a SLOG you want a SSD with latency as low as possible and very high durability. I have a pool which sees a lot of synchronous writes, so a SLOG is genuinely useful to me. However, this is NEVER faster than just turning off sync writes and SLOG is not used to increase the size of the RAM cache; more specifically, ZFS doesn't benefit from a SLOG being larger than the ZFS ARC. This SLOG device needs to tick This article aims to provide the information needed to understand what the ZIL does and how it works to help you determine This article aims to provide the information needed to understand what the ZIL does and how it works to help you determine Exploring the Best ZFS ZIL SLOG SSD with Intel Optane and NAND We use a new FreeBSD tool for simulating ZFS ZIL SLOG Every ZFS pool has a ZIL (ZFS Intent Log), it is just a certain section of the pool, unless you have a SLOG (Separate LOG device), in which case the it is on a dedicated device that is usually I screwed up and ordered Intel's H10 optane + SSD combo drives before thoroughly researching them. We use a new FreeBSD tool for simulating ZFS ZIL SLOG performance to test Intel Optane and NAND based SATA, SAS and PCIe NVMe SSD options As a follow-up to my last post (ZFS SLOG Performance Testing of SSDs including Intel P4800X to Samsung 850 Evo), I wanted Sync writes are notoriously slow on ZFS, so there is a mechanism to speed that up, which is SLOG. I have a 32GB intel optane drive that i use as SLOG.

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Zfs Optane Slog. for VMs and some apps, and it is only useful when A) SLOG is on a f