replacing SD cards on R620

Paul Archer parcher at masergy.com
Fri Apr 27 16:16:04 CDT 2012


On Fri, 27 Apr 2012, Wayne_Weilnau at Dell.com wrote:

> Paul,
> I will try to find some answers and then reply (or get somebody else to reply) to the list serve.  If you can answer the following questions, it will help me get an accurate answer:
>
> 1.  Does the SD card have ESXi or some other operating system on it?  If not, what are you using it for?
Linux. I can reinstall if necessary.

> 2.  What tool is indicating that it is 2GB?
>
The same. The OS reports both the drive and the partition as 2GB.


> I suspect that when the "mirror" is initially repaired, it essentially 
> creates a 2GB partition on the new SD leaving the other 14GB 
> un-partitioned.  The 2nd repair then replicates this.
>

I figured as much--but if you did something like that on, say, a VMware 
virtual machine, you'd see (probably after a reboot) that the drive was 
now larger, even though the partition was the same size. The partition 
could then be expanded to the size of the the drive, and the filesystem 
similarly expanded. But in this case, the drive size does not change.


> As for the size of the SD, it is the usual cost/size tradeoffs.  I'm not 
> a hardware guy, but my understanding is that the SD cards that we are 
> selling are of higher quality than what you buy for your camera.  SD 
> will wear out over time as more writes occur.  The ones that support 
> more writes cost more.  There is actually more complexity in these 
> devices than I realized.  They do wear leveling, etc, in order to extend 
> the life of the device.
>

While I understand that there are certain tradeoffs in price/performance, 
I don't think they apply here.
First, when I talked to our server specialist when I was getting the 
initial quote, she told me that even though I couldn't order cards bigger 
than 2GB through Dell, the cards were not certified.
Second, the cards are 2GB cards. No one makes 2GB cards any more; you 
can't find anything smaller than 4GB these days. So that strongly implies 
that these are older cards with fewer features. I may be wrong, of course.

At any rate, the fact that there is no way to buy a larger card from Dell 
(for any price) is not particularly cool. Several manufacturers make very 
high-end memory cards for professional photographers. I can't imagine them 
not having the chops to meet Dell's standards.


> Please elaborate on " lifecycle controller (which is still not quite ready for prime time)"
>

Sure. Much better than 11G!
But still kind of clunky, too many menus and sub-menus. Graphical 
environment for what is essentially a text-based configuration. (There's 
nothing in the LCC that couldn't be done in a curses interface, and faster 
'cause you wouldn't have to sweat having a mouse).

Big kickers for me:

1) My unit refuses to let me save the LCC network settings, making it 
impossible to do any firmware management or upgrades.

2) There's no way to create more than one virtual disk through the LCC. 
It's possible if you go directly to the RAID card's configurator, but if 
you try to create a virtual disk through the LCC, it'll wipe whatever 
configuration you already had. Now, on a 10-disk machine, it's much more 
likely that you'd want more than one VD. And this is an R620. The R720 
holds something like 24 disks?

pma

-------------------------------------
Paul Archer <paul.archer at masergy.com>
Senior Unix System Administrator
214-442-8827 o / 972-646-0137 m
MASERGY - www.masergy.com
Global Networking Redefined
-------------------------------------



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