On Thu, 11 May 2000 18:37:11 EDT, "David H. Brierley" wrote:
Are you saying "maxes out" in that it will not allow you to hook up
the last
shelf or that it runs out of horsepower?
You hit a maximum in one of the specifications. As per Dennis Haag
from
NetApp:
The F740 maxxes out at 16 shelves (8 per loop), 112 disks (56 per
loop),
or 928GB, whichever you hit first. So with 18GB disks 928/18 ~= 51.5
disks.
Parity disks and hot spares would not be counted against the 928GB
limit.
But.... According to my F740, an 18GB disk is not 18GB. The output of 'sysconfig -v' identifies the drives as follows:
2: SEAGATE ST118202FC FDF6 Size=17.0GB (35566480 blocks)
Based on my understanding of the way mathematics works, 928 divided by 17 is 54.5882. Since a raid group is limited to 28 drives, filling the filer this full requires at least 2 parity disks. Eight full shelves, at 7 drives per shelf, is 56 drives, minus the 2 parity drives, yields 54 possible data drives. The last time I looked, 54 was less than 54.5882. And this even ignores the question of spare drives, which I'm assuming you have at least one of and possibly more. So, it should be possible to completely fill eight shelves with "18GB" drives and not exceed any of the defined limits.
Yes, I had already conceeded that, perhaps I wasn't clear.
We run with 13 disk raid groups and we have a hot spare for each raid group. That makes it an even "6 drives per shelf" when calculating the capacity of the filer. Even assuming a full 18Gig on the drives, we can fully populate 8 trays.
-- Rob ---------------------------------------- Rob Windsor E-Mail - mailto:rob_windsor@adc.com Senior Unix Systems Administrator Voice - phone:972-680-6919 Computer Services Fax - phone:972-680-0370 Broadband Access and Transport Group __o ADC Telecommunications _`<,_ Richardson, TX 75082 (_)/ (_)