And I'd just add … amke sure you are running a recent enough release of ZFS to support importation of a pool without the SLOG device being available, just in case export/recovery of the pool need to be attempted elsewhere than the traditional server.
Of course they also limit deployments in poor man cluster scenarios and or HA configs such as NexentaStor. Craig On 1 Mar 2011, at 16:35, Garrett D'Amore wrote: > The PCIe based ones are good (typically they are quite fast), but check > the following first: > > a) do you need an SLOG at all? Some workloads (asynchronous ones) will > never benefit from an SLOG. > > b) form factor. at least one manufacturer uses a PCIe card which is > not compliant with the PCIe form-factor and will not fit in many cases > -- especially typical 1U boxes. > > c) driver support. > > d) do they really just go straight to ram/flash, or do they have an > on-device SAS or SATA bus? Some PCIe devices just stick a small flash > device on a SAS or SATA controller. I suspect that those devices won't > see a lot of benefit relative to an external drive (although they could > theoretically drive that private SAS/SATA bus at much higher rates than > an external bus -- but I've not checked into it.) > > The other thing with PCIe based devices is that they consume an IO slot, > which may be precious to you depending on your system board and other > I/O needs. > > - Garrett > > On Tue, 2011-03-01 at 17:03 +0100, Roy Sigurd Karlsbakk wrote: >> Hi >> >> I'm running OpenSolaris 148 on a few boxes, and newer boxes are getting >> installed as we speak. What would you suggest for a good SLOG device? It >> seems some new PCI-E-based ones are hitting the market, but will those >> require special drivers? Cost is obviously alsoo an issue here.... >> >> 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. >> _______________________________________________ >> zfs-discuss mailing list >> zfs-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Craig Morgan Cinnabar Solutions Ltd t: +44 (0)791 338 3190 f: +44 (0)870 705 1726 e: cr...@cinnabar-solutions.com w: www.cinnabar-solutions.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
