Sql 2016 replication immediate updating subscription

31-Mar-2020 10:30 by 2 Comments

Sql 2016 replication immediate updating subscription - sex dating hawaii

You install SQL Server 2016 on each node, and store database/log files on the CSVs (no SMB 3 file shares).

And Re FS metadata handling optimizes things too – you should use Re FS on the data volumes in S2D! And don’t forget that we have flash-based caching devices in place before the VM hits the virtual disk!

So if 2-copy mirror (like RAID 10) gives us the raw storage as usable storage, and only 1/3 with 3-way mirroring, this is too expensive.

2-way and 3-way mirroring give us the best performance, but parity/erasure coding/RAID5 give us the best usable storage percentage.

A requirement for this efficiency is using Remote Direct Memory Access (RDMA) which gives us the ultra-efficient SMB Direct.

There’s lots of replication traffic going on between the nodes (east-west traffic).

S2D will respect these boundaries for data placement, therefore for disk/server fault tolerance. Everything so far about fault tolerance in the presentation has been about 3-copy mirror.

And mirroring is expensive – this is why we encounter so many awful virtualization deployments on RAID5.The result (in Microsoft’s internal testing) was that they hit 600 IOPS per HDD …. in reality the caching devices were positively greatly impacting the performance of “spinning rust”. This is a PCIe bus-connected form of very fast flash storage, that is many times faster than SAS HBA-connected SSD.Comparing costs per drive/GB using retail pricing on New Egg (a USA retail site): Comparing performance, not price: If we look at the cost per IOP, NVMe becomes a very affordable acceleration device: Some CPU assist is require to move data to/from storage.Microsoft is recommending that 10-20% of the usable capacity in “hybrid volumes” should be 3-way mirror.If you went with the 100/900 balance for a light write workload in a hybrid volume, then you’ll get the same performance as a 1 TB 3-way mirror volume, but by using half of the raw capacity (1.5 TB instead of 3 TB). It’s deep down low in kernel mode, so it’s efficient (fewer context switches to/from user mode).The XO the groups and restore required bits instead of an entire stripe.