二级缓存需求。选项有“二级动态切换式缓存(L2ARC)”“独立 ZFS 意向暂存(SLOG)”以及“元数据专用分区(Special Metadata VDev)”。L2ARC 对并发读取有益,SLOG 对并发写入有益,但在家庭环境中罕见并发操作;据官方文档,“元数据分区”是和存储池强绑定的,一荣俱荣,一损俱损。最终决定通过 SLOG 试水——毕竟这次...
ZFS cannot run optimally and the disks operate slower. Try to keep special vdev usage under65%-70%capacity whenever possible. Try to plan how much future data will be added to the pool, as this
3) Special/Metadata Vdev从3-Way Mirror变成了2*2-Way Mirror(主要体现在CDM的4KiB写入和混合)...
A special vdev can store meta data such as file locations and allocation tables. The allocations in the special class are dedicated to specific block types. By default, this includes all metadata, the indirect blocks of user data, and any deduplication tables. The class can also be provisione...
现在lz4和zstd都支持多线程的。比如我现在用的centos 8 stream版本自带的是v1.8.3，当启用压缩时候，...
my special vdev uses 42.5gb space. Another server has 21.8T using 64k block size, it uses 44.7G of meta space. Block size matters alot. It's probably more linked to the amount of data in the pool, not the raw size. RAID-Z will require more metadata than Mirrors. Can you confirm...
I have been attempting to push certain zvol data on to a metadata / special vdev without any success. The root dataset has record size set at 1MB. "Special Small Blocks" is set at 128kb and below for the pool. Small block data in datasets works as expected. I have created new zvol...
RaidZ2 vs mirror vdev Hello. I currently have an hp microserver g8 equipped with a 1265L and 16GB of ram. (I intend to buy a motherboard for this CPU/RAM combo so I can place my rig in a define r5 or a rack case, but cannot afford this right now) My current storage config...
It occurs to me that with the introduction of the special VDEV, I will most likely want all of my spinning pools to have metadata on SSD, which will now be possible, so, great... But I immediately wonder if I will again find myself feeling quietly guilty for "breaking the rules" by...
If you want a special vdev "just to be sure its fast", a 3-5% minimum is ok. Often you do not want only metadata but also small io. In such a case it depends more on number of files and recsize settings so maybe 10% is more adequate. If you want to force some...