- May 29, 2011
9.2 has allegedly fixed some issues, but I have no idea what actually changed. One of these days I've got to set up a repository and build environment.
Sorry for asking again, is the following make sense to you?9.2 has allegedly fixed some issues, but I have no idea what actually changed.
The filesystem consumer typically decides whether to request a write as sync. In the case of ZFS writing filesystem metadata, it acts as both consumer and provider. ZFS also allows the admin to force all writes to be async or sync.In the end, which part of the system actually makes the decision if a write is a sync write or not?
It doesn't have much to do with this. ZFS can cache metadata in the ARC for rapid reading and has some tunables to control that, so one might see a fuzzy sort of metadata acceleration mechanism, but they're really totally separate things.Also (noob question alert ^^) Does the L2ARC also have something to do with all this, or is that something completely separate?
The Crucial M500 is a nice drive, but it's not one made for this type of usage. It's best to get a SSD designed for the data center and not a desktop class SSD. The Intel S3500 mentioned in the above link the is a good drive and works very well has an SLOG, I'm using them in 2 servers at the moment. Another interesting budget choice is a Seagate 600 Pro(using that in 2 other servers), the 100GB is pretty cheap(make sure it's the Pro version they are built for the data center), it performs better than the S3500 and costs about the same. If you have the budget the Intel S3700 is the top of the SSD food chain for things like this but they are starting to get expensive and in general would just outlast a S3500. After the S3700 you move into expensive PCI flash cards or SAS/SATA devices built to be SLOG devices(STEC makes some of these).
It would be a great slog and possibly over kill depending upon your needs. There is no 1 size fits all, you need to know your needs and work load and design something that fulfills those needs. Some work loads have no use for an slog others need some sort of enterprise PCI flash based card(think Fusion IO), most though fall between these 2 extremes.Wouldn't an Intel DC S3700 be good for a slog? It has an onboard capacitor and the 200 gig version has 3.65 Petabytes of write endurance.....
It could be, but it dependence on your needs. we are still waiting for our Samsung 600 Pro ssd.Wouldn't an Intel DC S3700 be good for a slog? It has an onboard capacitor and the 200 gig version has 3.65 Petabytes of write endurance.....