kelsey hudson wrote:
Stewart Stremler wrote:
256, if I remember right.
Ah, LOTS of room. :)
Indeed. Lots of room for lots of devices. Keep in mind that you can
have fibre tape drives, media changers, and other such devices as well.
NetApp et al reccommend you don't connect more than 28 disks (two
shelves) to a 1Gbps FC loop, 48 to a 2Gbps loop, and 96 to a 4Gbps
loop. Which makes sense, as you can easily saturate the bus with
that many devices.
It's less stressful to add suddenly-needed storage by simply adding
more disks than it is to add more disks *and* additional controllers,
even if in the long run adding the controller is needed for performance.
Oh, undoubtedly. In 99% of cases, adding the additional adapter will
require an outage, whereas adding a single disk (or even a shelf) can
be done hot(1) and is completely transparent to the user.
Even if it's not the best thing for performance reasons, it may be the
best idea if you can't afford to take an outage. If that's the case
though, one would suggest better growth planning (like having a hot
adapter ready for additional disks in the event they are necessary).
Or run virtualized on Zen. Then one has no further need to accommodate
growth planning. With Zen, you can do a hot move to an upgraded system,
or just a temporary move to a compatible system to allow upgrading the
main one and then moving back. (Assuming I understand Zen correctly.)
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