Below are a few
bookmarks and notes I wanted to keep track of from the last month or so - with
stuff on/from: CIFS, CISCO,
CITRIX, MICROSOFT,
NETAPP,
NETAPP KB,
SCAN.CO.UK, VEEAM, VIRTUALIZATION, VMWARE
## CIFS: RESEARCH ON EXCESSIVE OPEN AND CLOSE REQUESTS
##
“Batch OpLocks were
created originally to support a particular behavior of MS-DOS batch file
execution operation in which the file is opened and closed many times in a short period,
which is a performance problem. To solve this, a client may ask for an OpLock
of type "batch". In this case, the client delays sending the close
request and if a subsequent open request is given, the two requests cancel each
other.”
Oplocks and
Roaming/Mandatory Profiles
Access to a
redirected folder or a home drive disconnects regularly on a computer that is
running Windows Server 2008 R2 and Windows 7
## CISCO ##
Interesting article
from Menno de Liege: “When using a Cisco MDS environment with the Inter VSAN
feature on a 9222i for example, it can take a lot of work to complete the
zoning configuration….” READ ON!
## CITRIX ##
- What are the
limits of CloudPlatform hosts, clusters, pods and zones?
- Which version of
XenServer works with CloudPlatform?
- How do we deliver
multiple cloud-based services to our end users?
- Why use basic
zone vs. advanced zone?
- Who/what is
SolidFire?
This article
describes how you can configure Citrix CloudBridge 4000 and 5000 to optimize
NetApp SnapMirror traffic between two Data centers.
Image: NetApp SnapMirror
Async with Repeater SDX (DC to DC Test Topology)
“Citrix is pleased
to announce the new WAN-optimization appliances: CloudBridge 2000 and
CloudBridge 3000. These appliances come loaded with our WAN-optimization and
XenDesktop acceleration technologies including rich protocol optimization,
advanced TCP flow-control, adaptive compression and smart acceleration.”
Image: CloudBridge
2000 & 3000 range
## MICROSOFT ##
Including:
“… I use a Linux
based firewall/router running as VM …”
“… There are a few
options in this realm including pfSense, m0mwall,
and DD-WRT …”
## NETAPP ##
NetApp Communities
post on the NetApp Flash Accel and LSI Nytro WarpDrive solution.
Image: LSI Nytro
WarpDrive
NetApp Communities
post:
“To those of you
deploying Microsoft Windows 2012, you may have noticed a new feature called
'Windows Storage Management Service". This feature lets a Server
administrator do what have historically been storage management functions
directly from the windows Server Manager pane.”
Get visibility into
your NetApp storage system with Splunk!
It was Pi Day on
March 14th!
Image: Pi in
Clustered ONTAP
## NETAPP KB ##
Clustered ONTAP -
the command below reports false!
> sto fail show -node ha104-105-01 -fields possible
Cause 1: Takeover
is disabled due to the operator disabling takeover
Cause 2: Takeover
is disabled due to a version mismatch
Cause 3: Takeover
is disabled due to Degraded mode (mailbox disks)
Cause 4: Takeover
is disabled due to interconnect errors
Cause 5: Takeover
is disabled due to the disk shelf being too hot
Cause 6: Takeover
is not possible due to the NVRAM log being unsynchronized
Cause 7: Takeover
is not possible due to 'Partner node halted after disabling takeover'
Cause 8: Takeover
is not possible due to the local node already being in takeover state
Cause 9: Takeover
is not possible due to the Local node about to halt
Check for the locks
showing up on the data constituents.
> vserver locks show -fields lockid
Solution - run the
following command:
> vserver locks break -lockid {lockid you found}
This client bug is
fixed in newer Linux patches, for example, the latest update of Fedora 18 has
this bug fixed.
Clustered ONTAP - An
NDMP backup operation fails to start.
Cause 1: Resource
limitation: no available thread
Cause 2: Too many
concurrent backups are running
Cause 3: Unable to
obtain vol ref for Volume "volume_name"
Cause 4: Unable to
lock a snapshot required by a dump message
Cause 5: Volume is
temporarily in a transitional state
Data ONTAP 7-Mode
& Clustered ONTAP - AutoSupport has real world time and size constraints!
Clustered ONTAP:
system node autosupport> modify -node local -max-http-size 0 -max-smtp-size 8MB
system node autosupport> show -node local -fields
max-http-size,max-smtp-size
Data ONTAP 7-Mode:
> options autosupport.max_smtp_size 8388608
> options autosupport.max_
*read the article
for more CLI
## SCAN.CO.UK ##
A nice tool!
Image: eten USB
powered 8 port mini 10/100 metal switch
## VEEAM ##
Beta’s available
for:
## VIRTUALIZATION ##
With: VMware
vSphere, RedHat RHEV, Microsoft Hyper-V, Citrix XenServer
## VMWARE ##
Now see:
C:\Program
Files\VMware\VMware Tools> VMwareToolboxCmd.exe help
“Deployment of
vSphere on IP based storage is becoming more common and this paper provides a
technical overview of deployment considerations and best practices for running
vSphere on Network File System shared storage….”
“There have been
some recent questions about upgrading to the latest version of VMware Tools in
vSphere 5.1 and the benefits it may bring with future upgrades of VMware Tools….”
“Have you noticed
that for a powered on virtual machine in vSphere 5.1, there is now an additional
VMX file that ends with an ~ (tilde) found within the virtual machine's
configuration directory?”
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