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Replicated rootvg, ghostdev and NPIV
My team and I have recently
been trying to stream line our AIX disaster recovery process. We’ve been
looking for ways to reduce our overall recovery time. Several ideas were tossed
around such as a) using a standby DR LPAR with AIX already installed and using
rsync/scp to keep the Prod & DR LPARs in sync and b) using alt_disk_copy
(with the –O flag for a device reset) to clone rootvg to an alternate disk
which is then replicated to DR. These methods may work but are cumbersome to
administer and (in the case of alt_disk_copy) require... [More]
Tags: chris hds recovery led rootvg fc support ghostdev replication lpar hung gibson 554 boot replicated chris_gibson vfc vsp aix san channel virtual fibre dr disaster npiv hang |
Understanding viostat -adapter vfchost output.
The first
time I ran the ’ viostat –adapter’ command I expected to find
non-zero values for kbps , tps , etc, for each vfchost adapter. However, the values were always zero, no matter
how much traffic traversed the adapters.
$ viostat
-adapter 1 10
... vadapter: Kbps tps
bkread ... [More]
Tags: virtual vios powervm channel vfchost aix fibre viostat vfc -adapter npiv |
Collecting WWPNs for new Virtual Fibre Channel Adapters
I was
collecting a list of WWPNs for a bunch of new AIX LPARs I was installing from
scratch. There were two ways I could find the WWPN for a virtual Fibre Channel
adapter on a new LPAR i.e. one that did not yet have an operating system
installed. I started by
checking the LPAR properties from the HMC (as shown below). To speed
things up I moved to the HMC command line tool, lssyscfg , to display the
WWPNs (as shown below). hscroot@hmc1:~> lssyscfg -r prof -m 750-2
-F virtual_fc_adapters --filter lpar_names=lpar1... [More]
Tags: vfc wwpn sed lssyscfg aix fibre gibson hmc channel chris virtual |
SMS SAN zoning support
Until recently, if you were
configuring a new LPAR with virtual FC adapters you couldn’t force it to log
into the SAN before an operating system (such as AIX) was installed. I’ve
written about this before (see link below). I also offered a way to work around
this issue. https://www.ibm.com/developerworks/mydeveloperworks/blogs/cgaix/entry/new_hmc_commands_chnportlogin_and_lsnportlogin_login_in_virtual_fibre_channel_adapters_for_npiv_client_lpars1?lang=en As mentioned in my post, there are
new HMC commands to force a new LPAR to connect... [More]
Tags: npiv virtual_fibre_channel powervm chris_gibson aix power_systems vios vfc |
Checking num_cmd_elems for VFC adapters with kdb
This entry is
similar in theme to one of my previous posts about verifying your hdisk queue_depth settings with kdb . This time we want to check if an attribute for a Virtual FC (VFC)
adapter has been modified and whether or not AIX has been restarted since the
change. The attribute I’m interested in is num_cmd_elems .
This value is often changed from its default settings, in AIX environments, to improve
I/O performance on SAN attached storage. From
kdb you can identify the VFC
adapters configured on an AIX system using the vfcs... [More]
Tags: -p odm kdb lsattr chris_gibson num_cmd_elems adapter vfcs aix chdev reboot vfc |
