hey guys -
Working on some replication efforts.. And I haven't used EMC Timefinder
to push data from one DB to another.. Are there any documents with the
details available? I'm working on getting thru the EMC web site as well
as metalink, but wanted to throw this out on the list since everyone is
so helpful:-)
And I'm also in too much of a hurry to RTFM:-) since I need to get
something done by Wednesday..
Thanks in advance!
Greg Loughmiller
Sr Manager - Enterprise Data Architecture
gloughmiller (IPS)
678.893.3217 (office)
Aside from the excellent notes on the Oracle piece of it, there are some
EMC-side things to remember:
-remember that whatever host you want to perform the BCV split/establish
actions from needs to be able to see gatekeepers.
-The normal methodology is to create BCV groups based on functional
purpose if you're not using software RAID and if you're using software
RAID, make sure you match the BCV groups to the software RAID groups.
-If you're using Veritas or some other software volume manager, make
absolutely sure that the BCVs are not exposed to the same host as the STD
(source) volumes.
-Also, if you're using a software RAID layer atop the EMC devices (i.e.
RAID-0 across EMC RAID-1 volumes), make sure you use instant splits rather
than traditional splits. With traditional splits, the EMC volumes within
the BCV group are separated like a zipper, which can create corruption in
software RAID sets - instant splits quiesce all the volumes within the
group and then split them at once.
-From a performance standpoint, while you leave the BCVs in ESTABLISHED
state, the Symmetrix will use them as a third mirror for valid I/Os.
Depending on the revision of microcode, I seem to recall that the BCV will
be used for reads for all remaining valid tracks.
-Incremental establishes are much slower than full establishes - depending
on the rate of changed data, it could actually be faster to do a full
establish than an incremental. You probably want to time establishes both
ways.
-Is this on a Sun server? If it is, make sure you never do a reconfigure
reboot (touch /reconfigure or reboot -- -r or boot -r) while the BCVs are
established. If its a Linux box, you'll need to manually reprobe the SCSI
devices if you reboot during an established state. I don't know what to
do on windows or any of the other UNIXes, but remember that established
BCVs vanish from the SCSI channel, so avoid situations where the host is
rescanning or reconfiguring while they're established.
Feel free to email me off-list if you have any other questions on any of
this or if you run into any problems.
Thanks,
Matt
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Matthew Zito
GridApp Systems
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Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com
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