New Years Technical Blast!

·         General NetApp:

o   2040’s can only run up to ONTAP 8.1.4

o   2240’s can’t run below 8.1

o   8.2 licenses are worthless in 8.1, but you can generate temp licenses easily here: http://support.netapp.com/NOW/download/special/evaluation.cgi?

o   If your telnet connection dies right as you log in, there’s a stale connection.  Kill it with “logout telnet”

·         Snapmirror:

o   When snapmirror initialize gives you a “network error,” it might mean the source volume doesn’t exist/is misspelled/is too large.

o   “sysstat 1” is a quick easy way to view the throughput of a system

o   Options replication.throttle.enable combined with options replication.throttle.incoming/outgoing is a quick, easy way to turn down snapmirror traffic.  The value is in kilobytes/s, so “50,000” = ~50MB

o   A single 1Gb link can transfer as much as 130MB/s if the disks can handle it

o   Reverting a snapmirror destination is a very, very tough process.  Avoid it.

·         ISCSI:    

o   There’s a tool that will generate a script to re-set LUN serial numbers.   Ntstp.netapp.com, at the top menu bar under tools.

o   LUN ID’s, LUN SN’s, and iqn nodenames matter.  Luckily all are easy to set.

o   If you’re updating ONTAP to 8.2, Oracle Linux-based systems using ASMlib can crash entirely.  There’s an easy workaround, see page 61 in the 8.2 release notes.

·         CIFS:

o   CIFSCONFIG_SETUP.CFG contains the list of shares and permissions on the system.  You can just copy that to a new system to emulate them.

·         Bonus: you can separate snapmirror streams by editing your snapmirror.conf file.  Format:

Replication_stream1 = multi(first ip address of source, first ip address of destination)

Replication_stream2 = multi(second ip address of source, second ip address of destination)

Then for each snapmirror relationship, replace the source system’s name with the replication stream’s name.  Example:

rep1 = multi(172.16.0.7,172.16.0.5)

rep2 = multi(172.16.0.8,172.16.0.6)

rep1:volname destnetapp:volname_data kbs=5000 0 1

rep2:volname destnetapp:volname kbs=5000 0 1

·         Double bonus: Here’s a list of other important config files in the system.  Check them out!

KRB (DIRECTORY)
CIFSSEC.CFG
CIFSCONFIG_SHARE.CFG
CIFS_HOMEDIR.CFG
CIFS_NBALIAS.CFG
CIFSCONFIG_SETUP.CFG
EXPORTS
FILERSID.CFG
GROUP
HOSTS
HOSTS.EQUIV
KRB5.KEYTAB
KRB5AUTO.CONF
LCLGROUPS.CFG
NSSWITCH.CONF
PASSWD
QUOTAS
RESOLV.CONF
USERMAP.CFG