Mirror between FC and iscsi

Is that type of mirror possible? We are currently running a 2 node cluster with NW 6.5 SP8 NSS volumes connected to an AX100 fiber san, and we're planning to migrate to OES 2 Linux VMs connected to an EQ PS5000 iscsi san. If I can mirror the volumes first, then our migration downtime should be reduced quite a bit.
If this scenario is possible, my next question is, will users see a performance impact by having a mirror with iscsi between the time we mirror and the time we migrate? I know iscsi performance isn't too good on NW. I imagine the initial mirror setup would take awhile if iscsi is slow, too. Thanks for any info.
Tim

Update: I set up a test cluster volume on the AX100 fiber san and created a mirror on the EQ iscsi san and it worked like a champ. The documentation was a bit confusing, so there was a hiccup when I tried to create a partition on the EQ first, but I blew away the partition and then was able to find the free space on the device.
I tested upload speeds from my desktop to both the new mirrored volume and a non-mirrored san volume on the same server and got almost exactly the same speed on a 547 MB upload.

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HT4437 how to use airplay mirroring between ipad3 and apple tv without any internet or wifi

I do presentation and a lot of the time, there is no wifi or internet connection available in the room (school, church, community center).
Is there a way to use airplay mirroring so I can use my powerpoint or my keynotes from my ipad to the apple tv?
I also have a macbookpro, I know there is a way to create your own network with the macbookpro, how don't remember how, but would prefer not to have to carry my macbookpro.
thanks
Christian

You can stream the content with a local connection. You dont need "internet", but need to connect the apple tv to a wireless router(plugged in with no internet) or hardline. Then connect the ipad wirelessly to the same router. Its a basic internet setup without the "internet ethernet cord" plugged in.

IMessages not mirroring between Mac and iPhone

Trying out Messages like everybody else!
First I signed in with the wrong Apple ID. Now I'm actually logged into iCloud with the same Apple ID on both my Mac and my iPhone. Parenthetically, I would like to wonder out loud how synchronization of addresses, calendar items and notes ever happened before, with mismatched Apple IDs.
The problem is that I don't see that the iMessages I send in Messages on the Mac are mirrored in Messages on my iPhone. Anybody else seeing this? It makes me wonder, whether this is beta behavior or whether I still don't have everything configured correctly.

Actually even now its operation seems to be sporadic in success.
Below I have 3 different devices setup with the same credentials (using [email protected] as the Apple ID and caller ID).
1. Test One, I started a new conversation on Messages on the iMac, that message gets synced over on the iPhone but doesn't make it to the iPad.
2. Test Two, the Second message was typed on the iPhone and syncs through on all devices.
3. Test Three, the Third message was typed on the iPad, this message gets synced on the iPhone, but doesn't make it through to the iMac.
So all devices prove to a point that they are setup for the same account but have limited success in syncing through to the other devices.
I know this is only Beta, but I'm worried that such a fundamental flaw in the system causing intermittent syncing of messages across devices is technically a catestrophic failure at the end of the day, imagine a real world situation where I'm sure I had a conversation, but until I check several devices, I can't be sure what was said just in case some messages didn't sync through!?!?! That has the potential of making the service completely useless if you can't trust the accuaracy of your message history!!

How to mirror between the production server and the multiple local servers.

I am currently looking for the best way to correspond between our production server and the multiple local servers. Because the production server is the only server that holds the latest updating applications, and our local servers are located for each developer’s local machines where the all modifications and creations are done. So when the developer locally makes changes for assets or files, he creates a patch archive first, then accesses to the production side Administration console screen and imports them from Application Management screen.
We tried to find a way to see the imported date before (so we know which one has been imported as new.), but there is no show in the Administration console Application Management screen. There is Creation date but it’s set as we initially imported the full archive files, but not patch files. Since between applications have some types of the dependencies (like fragments or image files), what is the best way to keep mirroring between the production server and local servers? Or we should simply not use patch file for updating server?
Thanks,

Check out this utility : http://blogs.adobe.com/livecycle/2013/03/adobe-livecycle-configuration-migration-utility.h tml
Thanks,
Wasil

Different Drive Structure Between Principal and Mirror

We havea 2-node (active/active) cluster with four failover instances installed. We use a dedicated drive for data files, one for log files and one for tempdb per instance .Predicting that we will be adding more instances in the future, we realized that we
would run out of drive letters to set up. We intend to switch over and use mounted volumes instead that way we only use 1 drive letter per instance and will be able to add many more failover instances in the future. However, seen as we have over 150 databases
across all current instances, reconfiguring the cluster drive setup will require a lot of time and work and is not in the immediate plans for our team (me :( ). I need to mirror as many databases as possible, based on priority, to a DR server on a geographically
remote location. Since this server isn't setup with SQLServer yet, I was wondering if it would be a good idea to have the DR server set up with mount volumes now and establish mirroring between our production environment and the DR server that way so that
at least half the battle is won. I am aware that the best practice for mirroring is to have the same drive structure between the principal and mirror server, however it is not a requirement. The only example issue I have seen with this set up is when you add
a data file to a database and the DDL statements get sent over to the mirror and will fail since the drive setup will not be the same. This is something I am willing to deal with since adding data files to our databases is not something we do often, or at
all. As new databases are added and mirrored, the WITH MOVE clause of the RESTORE statement can be used to place the files in their correct location in the mirror server.
Other than this, are there any other things to consider for this kind of mirroring set up?
Leroy G. Brown

Hi Leroy G,
According to my knowledge, you can deploy database mirroring with different drive structure. And the known issue is that if you add a file to the Principal, the DDL commands get applied across the Mirror, then your database will go into a suspended
status until you duplicate the path on the mirror.
However, as your post, you can use WITH MOVE option to create database on Mirror server. For more details, please follow the steps in this
blog.
Meanwhile, about setting up database mirroring, I recommend you review this online
article.
Thanks,
Lydia Zhang

HT204291 The Apple sales rep told me I could use Airplay Mirroring between my iPad2 and AppleTV via bluetooth and I didn't need wifi. Is that true?

The Apple sales rep told me I could use Airplay Mirroring between my iPad2 and AppleTV 2 via bluetooth and I didn't need wifi. Is that true?

No. AirPlay is via Wi-Fi.
http://support.apple.com/kb/HT4437
http://support.apple.com/kb/HT5209

Airplay mirroring between my MacBook Pro and Apple TV (1080p one) has always worked fine until now. I only sometimes get video but usually just audio. Has anyone experienced the same issue?

When using Airplay mirroring between macbook pro and apple tv I cannot see video, only hear the audio. Worked fine before. Any suggestions on what the problem could be?

I have the exact same problem. The picture is very slow, incredibly pixelated... and renders my apple tv virtually useless until this problem gets resolved. I currently have an apple tv 3, ipad retina, iphone 4s, and a 2011 macbook air. I use the apple tv almost exclusively for mirrored content. And this is definitely causing quite a problem for me.
I had been able to use this for presentations as well- but until this problem gets resolved - I may have to look for a backup solution/product. And I imagine that I'm not alone in this... Please get this resolved quickly!

Do you have any cable can mirror screen between iphone4 and monitor ?

Do you have any cable can mirror screen between iphone4 and monitor ?

the vga and the hdmi ones should

How to sync the data between the two iSCSI target server

Hi experts:
I have double HP dl380g8 server, i plan to install the server 2012r2 iSCSI target as storage, i know the iSCSI storage can setup as high ability too, but after some research i doesn't find out how to sync the data between the two iSCSI target server, can
any body help me?
Thanks

Hi experts:
I have double HP dl380g8 server, i plan to install the server 2012r2 iSCSI target as storage, i know the iSCSI storage can setup as high ability too, but after some research i doesn't find out how to sync the data between the two iSCSI target server, can
any body help me?
Thanks
There are basically three ways to go:
1) Get compatible software. Microsoft iSCSI target cannot do what you want out-of-box but good news third-party software (there are even free versions with a set of limitations) can do what you want. See:
StarWind Virtual SAN [VSAN]
http://www.starwindsoftware.com/native-san-for-hyper-v-free-edition
DataCore SANxxx
http://datacore.com/products/SANsymphony-V.aspx
SteelEye DataKeeper
http://us.sios.com/what-we-do/windows/
All of them do basically the same: mirror set of LUs between Windows hosts to emulate a high performance and fault tolerant virtual SAN. All of them do this in active-active mode (all nodes handle I/O) and at least StarWind and DataCore have sophisticated
distributed cache implementations (RAM and flash).
2) Get incompatible software (MSFT iSCSI target) and run it in generic Windows cluster. That would require you to have CSV so physical shared storage (FC or SAS, iSCSI obviously has zero sense as you can feed THAT iSCSI target directly to your block storage
consumers). This is doable and is supported by MSFS but has numerous drawbacks. First of all it's SLOW as a) MSFT target does no caching and even does not use file system cache (at all, VHDX it uses as a containers are opened and I/O-ed in a "pass-thru" mode)
b) it's only active-passive (one node will handle I/O @ a time with other one just doing nothing in standby mode) and c) long I/O route (iSCSI initiator -> MSFT iSCSI target -> clustered block back end). For reference see:
Configuring iSCSI Storage for High Availability
http://technet.microsoft.com/en-us/library/gg232621(v=ws.10).aspx
MSFT iSCSI Target Cluster
http://techontip.wordpress.com/2011/05/03/microsoft-iscsi-target-cluster-building-walkthrough/
3) Re-think what you do. Except iSCSI target from MSFT you can use newer technologies like SoFS (obviously faster but requires a set of a dedicated servers) or just a shared VHDX if you have a fault tolerant SAS or FC back end and want to spawn a guest VM
cluster. See:
Scale-Out File Servers
http://technet.microsoft.com/en-us/library/hh831349.aspx
Deploy a Guest Cluster Using a Shared Virtual Hard Disk
http://technet.microsoft.com/en-us/library/dn265980.aspx
With Windows Server 2012 R2 release virtual FC and clustered MSFT target are both really deprecated features as shared VHDX is both faster and easier to setup and use if you have FC or SAS block back end and need to have guest VM cluster.
Hope this helped a bit :)
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

SQL Database replication between Primary and DR site

Hi,
We are setting up a DR Site, for our Production SAP system.
At present the curren setup for Production SAP system are as follows.
SAP ERP 2005 (SAP ECC 6.), ABAP+JAVA on Windows with MS SQL Server
2005.
Data are stored on SAN and SAP installed on MSCS Cluster enviornment.
For Setting up the DR site, we are setting up Central System
installation and replication will be configured between SAP
Production/Primary system and DR site.
We are shoadwing at our test setup and facing below replication issues
while setting up transactional replication in MS SQL server 2005.
1. At present 78716 articles are available on Production Database, and
SQL fails the replication publication after 59000 articles.
We open the ticket with Microsoft and below are the suggestion provided
by them.
1. Microsfot suggest to prepare 2\3 publications for total number of
tables, 1 publication for all Views and 1 publication for SPs,
Functions and Data types with single Distributor Agent. Distribution Agent will
take care of propagating changes in the tables across the publications.
2. All related tables (Parent child relationship) to be published on
one publication.
3. It would recommend to create 4 publications: 2 for the tables, 1 for
the views and the other for the stored procedures. This would ensure
better manageability.
The main concerns here is about splitting the tables into two different
sets with about 30,000 in one of the publications and the rest in the
second publication.
You will have to make sure that all the dependant tables are included
in the same publication. Since this database is a SAP database, requesting to provide information as follows.
1. Identify and split the entire set of table into two/three groups.
2. How to publish dynamic tables (The tables which get created post
publication process).
Regards,
JP

Hi,
for database mirroring and log shipping there a several very good whitepapers and other documents out there:
[http://download.microsoft.com/download/d/9/4/d948f981-926e-40fa-a026-5bfcf076d9b9/SAP_SQL2005_Best%20Practices.doc]
[http://blogs.msdn.com/saponsqlserver/archive/2007/09/26/what-did-we-learn-using-database-mirroring-over-the-last-two-years-in-our-sap-erp-system-second-revision.aspx]
[http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032297524&EventCategory=5&culture=en-US&CountryCode=US]
[http://sqlcat.com/whitepapers/archive/2007/11/19/database-mirroring-best-practices-and-performance-considerations.aspx]
Furthermore see note 965908 for this.
The needed bandwidth depends on the amount of log you create in a given timeframe. Internet bandwidth can be suffient, if you don't generate much log (btw, i don't understand the term RTD is 220).
In the log shipping scenario you can run the DR site in standby mode, then a readonly access (as DBCC etc.) is possible.
Regards
Clas Hortien

Mirror e-mail and all folders on a desktop and a laptop

I use my latptop for traveling which is about every three weeks. I need all the e-mails from my desktop on my laptop. With apple mail all the e-mails I recevied show up on both. But once I put an e-mail in a folder, then it no longer shows up on the other computer. Any suggestions for mirroring all folders and their contents on both computers.

You’re welcome.
Assuming you have enough space allocated to your .Mac mail account on the server to do it, you must choose the .Mac server as the location when creating your custom mailboxes instead of creating them as “On My Mac” mailboxes, then move there the messages that you want to keep synchronized between computers. Mail Help’s “Creating a mailbox” article explains how to do this.

I am trying to project a film from an ipad mini with a vga cable to a projector. The film played, but the ipad did not mirror what was being projected. I am trying to be able to mirror the devices AND isolate the window so I can use different menus wit

Hello-
I am trying to project a film from an ipad mini with a vga cable to a projector. When tested, the film played, but the ipad did not mirror what was being projected, it was a black screen. I am trying to be able to mirror the devices AND figure out how isolate the window so I can use different menus with the film still playing.
Any one know an app or softward that i can use?
Thank you!
Christie

To move an iPhoto Library to a new machine:
Link the two Macs together: there are several ways to do this: Wireless Network,Firewire Target Disk Mode, Ethernet, or even just copy the Library to an external HD and then on to the new machine...
But however you do choose to link the two machines...
Simply copy the iPhoto Library from the Pictures Folder on the old Machine to the Pictures Folder on the new Machine.
Then hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Choose Library'
and select the Library that you moved. That's it.
This moves photos, events, albums, books, keywords, slideshows and everything else.
Your first option didn't work because you imported one Library to another. Every version and thumbnail is imported like a distinct photo, you lose all your Albums, Keywords etc., the link between Original and Previews is destroyed, the non-destructive editing feature is ruined and so on. In summary: it's mess.
Your second option didn't work because you simply referenced her library on the old machine.
Regards
TD

Fault Tolerance of NFS and iSCSI

Hello,
I'm currently designing a new datacenter core environment. In this case there are also nexus 5548 with FEXs involved. On this fex's there are some servers which speak NFS and iSCSI.
While changing the core component there will be a disruption between the servers.
What ks the maximim timeout a NFS or iSCSI protocoll can handle while changing the components. Maybe there will be disruption for a maximimum of 1 sekond.
Regards
Udo
Sent from Cisco Technical Support iPad App

JDW1: In case you haven't received the ISO document yet, the relevent section of the cited ISO 11898-2:2003 you want to look at is section 7.6 "Bus failure management", and specifically Table 12 - "Bus failure detection" and Figure 19 - "Possible failures of bus lines".

RAC and iSCSI thoughts

Hi,
I'm in the early stages of designing a RAC installation and am wondering if iSCSI is a possibility for the shared storage. As far as I have been able to tell, the only certified shared storage systems are all FC based.
I'm wondering if anyone here has any thoughts/experiences with RAC and iSCSI that they'd like to share.
regards
iain

I built my iSCSI solution using linux and off the shelf raid solutions - originally just using gig-e cards, however i have upgraded to the accelerated cards (recognizes iSCSI and offloads the host CPU of procesing) and it works great.
There are some really affordable solution either way these days. Fibre Channel is still more expensive on the drive side considering moderm SATA drives are catching up in performance.
I built a 3.2tb iSCSI network that is shared between 6 servers running a web index of 100milliion pages with about 60k queries a day and it works great. I was able to roll it out on the colo's switches without getting specialized cabinets, fiber channel switches and only sent in upgraded nics.. sooner or later as the queries increase i'll send in a seperate gigE switch - however its just on its own vlan now.
For me it was a lot of work since i built a system from scratch - today lots of vendors offer off the shelf components are bargain basement prices compared to when i ventured into it :)

Difference between asm and san

Dear all Guru's,
I have a question what is difference between san and asm because san also provide mirroring like asm,why we shuld go for asm.
Regards,
Jam

926840 wrote:
but i want to know if i don't use asm or use asm storage layer for oracle dbf file?.what is the benefit of using asm storage because some of organization don't use asm storage.There are two basic types of storage for Oracle databases.
"Cooked" file system. This means the disk is formatted and managed via a specific file system driver. On Windows, that would be ntfs. On Linux, that typically would be something like ext3.
This file system is managed by the file system driver loaded into the kernel. It does directory and file management, service I/O calls to read and write files, provides caching, and so on.
ASM does not support cooked file system as it already has a driver that manages that formatted file system drive/partition.
Raw disks is the second storage type. This means it is unformatted - and as such, you cannot (via standard o/s commands) use the drive to create/update/delete/etc directories and files.
ASM supports managing such raw (non-cooked) devices. As these devices are directly used by the database, the database can better control and managed device access.
Simple example. The database writes 10 8KB database blocks to a cooked file system. It has no idea whether those 10 blocks were actually written to disk.. or whether the file system driver has cached that write and all 10 blocks still sit in memory. The database itself also has a cache. So there are now 2 memory caches.. a physical database I/O may actually be a logical file system I/O.. These factors make managing and determining performance complex.
A raw non-cooked device does not have such a secondary cooked file system cache. If the database does a physical write to disk, the data is actually written to disk. There is a single memory cache that is managed by the database. Less complexity and less ambiguity. And it can also mean better performance.
Manually managing raw device is however complex. And in the past, problematic as the database directly used the raw device without providing any type of management layer for raw devices. ASM addresses that issue - and addresses it very well.
Using SAN LUNs as cooked file systems for an Oracle database does not make much sense IMO. SAN LUNs should be used as raw devices for the database - and ASM used as management layer for these devices.

Mirror between FC and iscsi

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