I didn't meant using slog for the root pool. I meant using the slog for a data pool. Where the data pool consists of (rotating) hard disk and complement them with a ssd based slog. But instead of a dedicated ssd for the slog I want the root pool share the ssd with the slog. Both can mirrored to a second ssd. I think that in this scenario my initial concern remains. Since you cannot remove an slog from a pool, if you want to move the pool or something bad happens you're in trouble.
Richard I'm under the impression that most current ssd's have a dram buffer. Some are used only for reading some are also used for writing. I'm pretty sure the sun LogZilla devices (the stec zeus) have a dram write buffer. Some have a supercap to flush the caches others don't I'm trying to compile some guidelines regarding write caching, ssd and zfs. I don't like the posts like "I can't import my pool" "my pool went down the niagara falls" etc. So in order to prevent more of these stories I think it's important to get it in the open if write caching can be enabled on ssd's (full disk and slice usage) I'm really looking for a conclusive test to determine wether or not it can be enabled. Regards, Frederik -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
