From: NetComrade (netcomrade@bookexchange.net)
Date: Thu Jan 06 2005 - 18:59:43 EST
All,
We are considering replacing our 4xa5200's with VxVM on top to 4x3510FC
arrays. We will be losing almost half the spindles in the process (88 vs
48). However, that doesn't worry me _that_ much yet, since judging by
looking at current IO operations per second we should be fine, however it
looks like I will be losing some (if not a lot) flexibility vs JBOD that
a5200's provided. We currently have 3 hosts attached to 4 a5200's via hubs
(this is actually an unsupported config by Sun, but works), a similar
setup will be done with 3510's, but some growth flexibility would be
nice. Current 3 hosts house various Oracle databases, and are setup in
Veritas HA (Cluster).
I never dealt with hardware RAID, and looks like 3510FC has a limitation
of 8 'logical disks', which you can further sub-separate into LUNs and
present it as different devices to the OS. (I've been reading the Sun
StorEdge Just The Facts guide). The paper does mention sume 'Traffic
Manager', is that equivalent to VxDMP?
First question, is how does dual pathing work with 3510's? Do I still need
some special software for that, or will the 3510 present the LUNS (i
assume in some cXtXsX format) from both RAID cards, shouldn't the Cx be
different for each controller that connects to say FC0 (top) and FC1
(bottom) ports
Can I still mirror across arrays, w/o using VxVM (e.g. will I see which
data is where in 3510 cli or GUI).
Is there are any online reconfiguration available (like w/ VxVM)?
What is the maximum # of disks in RAID10 or RAID01 config?
The paper mentions that once you go beyond 4 arrays you lose max# of
servers, but does that # immediate drop to 2, or will I be fine with 3
servers and 6 arrays?
Can I have both Logical Disks, and 'JBOD' functionality in the same
config? (e.g. have I have let's say arrays 1 and 2 configured as RAID10,
but mirror across individual disks between 3 and 4 using VxVM).
And lastly
Does ?
Private Loop Mode = AL_PA (as in A5200)
Point to Pont Mode = F_port (but requires a switch)
Public Loop Mode = FL_port (but also requires a switch)
And where can I read more about Sun specific SAN topologies.
Any caveats in moving from a5200 to 3510? The migration, if ever to
happen, will be to build a parallel system and slowly move data there.
will summarize..
Apologies to those that are on VxVM list, as I'll repost there as well
Thanks in advance.
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