On Thu, Jan 14, 2010 at 11:35 AM, Christopher George <cgeo...@ddrdrive.com> wrote: >> I'm not sure about others on the list, but I have a dislike of AC power >> bricks in my racks. > > I definitely empathize with your position concerning AC power bricks, but > until the perfect battery is created, and we are far from it, it comes down to > tradeoffs. I personally believe the ignition risk, thermal wear-out, and the > inflexible proprietary nature of Li-Ion solutions simply outweigh the benefits > of internal or all inclusive mounting for enterprise bound NVRAM.
That's kind of an overstatement. NVRAM backed by on-board LI-Ion batteries has been used in storage industry for years; I can easily point out a company that has shipped tens of thousands of such boards over last 10 years. Regards, Andrey > >> Is the state of the power input exposed to software in some way? In >> other terms, can I have a nagios check running on my server that >> triggers an alert if the power cable accidentally gets pulled out? > > Absolutely, the X1 monitors the external supply and can detect not only a > disconnect but any loss of power. In all cases, the card throws an interrupt > so that the device driver (and ultimately user space) can be immediately > notified. The X1 does not rely on external power until the host power drops > below a certain threshold, so attaching/detaching the external power cable > has no effect on data integrity as long as the host is powered on. > >> OK, which means that the UPS must be separate to the UPS powering >> the server then. > > Correct, a dedicated (in this case redundant) UPS is expected. > >> Any plans on a pci-e multi-lane version then? > > Not at this time. In addition to the reduced power and thermal output, the > PCIe x1 connector has the added benefit of not competing with other HBA's > which do require a x4 or x8 PCIe connection. > > Very appreciative of the feedback! > > Christopher George > Founder/CTO > www.ddrdrive.com > -- > This message posted from opensolaris.org > _______________________________________________ > 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
