User guide

DataDirect Networks SFA™ OS 2.1.1.2 Release Notes Revision A2 | 9
o If the ULA field has the value "0000000000000000", continue to wait and
not issue any CLI commands besides "show controller".
Here is an example output of the condition where you would want to wait:
$ show controller
*************************
* Controller(s) *
*************************
| Up Time | |Encl| |
…
Idx|Name |Mastership|Locality| D: H: M: S|RP| ID |Idx | ULA |
…
-----------------------------------------------------------------------------------------------
…
0 A PRIMARY LOCAL 0000:20:24:34 1 0001ff0900180000 0 00000001ff0800ac
…
1 B SECONDARY REMOTE 0000:00:00:05 1 0001ff09002d0000 0 0000000000000000
…
Total Controllers: 2
o When the ULA number has something other than all zeros for the remote
controller, it is now safe to issue CLI commands and avoid the
communication problems.
• Some sequential read workloads with request sizes between 128 KB and 1024 KB may
require enabling read ahead caching (prefetch) to obtain full performance. (SET
POOL <#|*> READ_AHEAD_CACHING ON). (DE9676)
5.2 SFA12K-20, SFA12K-40, and SFA12K-E
• An issue exists where a drive inserted into the front slots (slots 1-14) of the SS8460
may not be seen. This occurs only with the Hitachi 3TB NL-SAS drive and is an issue
with the SS8460 enclosure firmware v0103. To workaround this problem, move the
drive to another row in the enclosure. This will be fixed with a new enclosure
firmware release for the SS8460. (DE9721)
5.3 SFA12K-20E and SFA10K-E
• VNC connections not authenticated or encrypted for VMs (DE6353)
On SFA10K-E and SFA12K-20E controllers, currently VNC connections to Virtual
Machines (VMs) are not authenticated or encrypted. Customers concerned about
security access to these VMs should disable the VNC stack attribute. For example, to
disable VNC connections for a stack, type app set stack XXX vnc=false
where XXX is the stack id. Note, changing this stack attribute will take effect the next
time the stack is started.
• Clocksource tsc unstable errors (DE4620)
On SFA12K-20E controllers, error messages similar to the following may be reported
on the running VM with dmesg or in system logging:
Clocksource tsc unstable (delta = -519494463 ns). Enable clocksource failover by
adding clocksource_failover kernel parameter.
A workaround has been provided for GRIDScaler 2.0.0, so this error should no longer
appear. For other releases, the following workaround can be applied to have the
kernel fallback to HPET mode if the guest OS detects a problem with TSC. In the
kernel parameter list of the VMs, add the following line to the VM kernel boot line in
/boot/grub/grub.conf.
clocksource_failover=1