Re: [OpenIndiana-discuss] ZFS with Dedupication for NFS server
> From: Roy Sigurd Karlsbakk [mailto:r...@karlsbakk.net] > > > With the 8T storage... Add 8-16G ram to your server on top of your > > baseline. > > I never got around to filling it. Already at about 1.2TB fill, it was dead > slow, > and for that the 8GB RAM should suffice. > > > I'm not sure how to calculate extra ram requirements for l2arc. > > AFAIK, L2ARC will just "add more, slower RAM"... Sorry, both of these statements are inaccurate. (1) Well, I'll drop the subject of 8G being enough ram. If I say any more about that, I'll just be repeating myself. So I'll only repeat one part: 8G is not enough if you have dedup and l2arc enabled and expect it to perform reasonably. I don't even run a laptop with less than 8G of ram anymore. (2) L2arc is not simply a slower extension of L1arc as you seem to be thinking. Every entry in the L2arc requires an entry in the L1arc. I don't know what the multiplier ratio is, but I hear something between 10x and 20x. So if you have for example 20G of L2arc, that would consume something like 1-2G of ram. Oddly enough, just google for this: L2ARC memory requirements And what you see is --- A conversation in which you, Roy, and I both participated. And it was perfectly clear that you require RAM consumption in order to support your L2ARC. So, I really don't know how any confusion came about here... You should be solidly aware by now, that enabling L2ARC comes with a RAM cost. ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] ZFS with Dedupication for NFS server
> In theory, dedup should accelerate performance when data is > duplicated. > > In the specs you quoted above, you have not nearly enough ram. I would > say you should consider 4G or 8G to be baseline if you have no dedup > and no l2arc. But when you add the dedup and the l2arc, your ram > requirements increase. > > With the 8T storage... Add 8-16G ram to your server on top of your > baseline. I never got around to filling it. Already at about 1.2TB fill, it was dead slow, and for that the 8GB RAM should suffice. > I'm not sure how to calculate extra ram requirements for l2arc. AFAIK, L2ARC will just "add more, slower RAM"... Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] USB 3.0
* Apostolos Syropoulos [2011-04-24 14:32]: > I would like to know if there are any plans to > include support for USB 3.0 devices? I suppose > > thatsys-admins don't need this, but I guess > > ordinaryusers would love to have this feature. OpenIndiana will get USB 3.0 support if someone at Illumos implements it, I've not heard anybody working on it but you might want to ask on illumos-discuss. -- Guido Berhoerster ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
[OpenIndiana-discuss] USB 3.0
Hello, I would like to know if there are any plans to include support for USB 3.0 devices? I suppose thatsys-admins don't need this, but I guess ordinaryusers would love to have this feature. Regards, A.S. -- Apostolos Syropoulos Xanthi, Greece ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
