2 / 3 way mirror - any visible difference ?

Hi - I created some 2 & 3-way mirrored storage spaces (on Win2012R2)
(Luckily, when I created them I used "sensible" names, so I know which is 2-way and which is 3-way)
But since then, I've been up&down Server Manager's menus, but I can't see anywhere where Server Manager shows if it's a 2 or 3-way mirror
Have I missed something, or do I have to resort to PowerShell to display this information ?

Hi,
In the Server Manager, you could right click the virtual disk, click Properties, then click
Details, in the Property drop-down box choose NumberOfDataCopies. The value 2 indicates two-way mirror and the value 3 indicates three-way mirror. You could also use the PowerShell command “get-virtualdisk –friendlyname <friendly
name> | fl” to get the value of NumberOfDataCopies.
Best Regards,
Mandy
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Lossy DNG shows strong visible differences but JPG not, is this a bug?

Hello,
I tried out the lossy DNG format with a lot of pictures.
For most pictures I can't find any visible differences.
But I found also some pictures with very noticible visible differences between lossless and lossy DNG.
It seems that the lossy DNG format has problems with dark pictures with small light sources for example
the stars in the dark sky or the red lights of an aeroplane in the dark sky.
I have an example where you can see red security lights of a great antenna on top of a mountain.
Surprisingly with this extreme example the JPG versions looks much better as the lossy DNG version of my source lossless DNG.
Here is the cropped JPG from the lossless DNG (file size 10877KB):
Between this JPG and the lossless DNG file is no visible difference.
And here a JPG from the lossy DNG (file size 13261KB):
Between this JPG and the source lossy DNG file is no visible difference.
The source of both DNG files was a NEF File from a Nikon D7100.
Also interessting is, that for this excample the file size of the lossy DNG is greater than the lossless DNG. This seems crasy IMHO.
I was very surprised, that JPG result is is much better than the lossy DNG for this case.
Perhaps there is a hidden bug in the lossy DNG conversion process.
I hope Adobe can look in to this. If you need the original NEF file let me know.

JimHess wrote:
I thought about responding the other day, but decided my remarks wouldn't help you. And they still won't because I'm going to give you my personal opinion about lossy DNG. I don't think it is intended for your master "important" images. I watched a video on Adobe.tv about this, and the example that was given was, suppose you have taken pictures at a wedding. Perhaps you have 2000-3000 images, 500 of which are keepers that are really good. You don't want to get rid of the other bunch but want to save space. So those would be the images that you would convert to lossy DNG. I mean, let's be realistic about this. You can't throw away data and hope to still have full raw quality. That isn't the idea behind the format.
Personally, I think converting to DNG of any sort as a workflow routine is frivolous and unwise. I know a lot of people routinely download and convert, and then they don't have copies of their original raw images. Yes, I know, the DNG files contain all the original raw image data. But not all software will read those DNG files. For example, I use Nikon cameras. The cameras shipped with ViewNX 2. It's not a very useful program, but has a couple of features that I like to use once in a while. But it won't open the DNG files. And if I have converted and then discarded the original NEF files, I can't use the software. With my cameras there is only a 15-20% savings in space. The tutorial I watched indicated that the lossy DNG files would load in Lightroom up to 8 times faster. I haven't used a stopwatch, but if anything the DNG files take longer to load than the original NEF files.
The only benefit I see to converting to DNG is if I have a file from a camera for which I don't have native support because my software is older or not up-to-date. I know this hasn't helped you. But maybe it will stimulate some conversation and you'll get a more enlightening opinion from someone else.
First of all I want to use lossy DNG because I want save space.
Second, I have no extra XMP-File for every image.
If I can't see any visible difference between a lossy DNG and a lossless DNG, then I have no problems with losing some data.

Is there any way to tell the differences between auroras or betas?

There are various arouras and betas released during each rapid release cycles.
Is there any way to tell the differences (changes/fixes) between auroras or betas?
bugzilla can only tell the target for landing but not releases for some of the changes/fixes ...

The Beta builds of a version has about six to twelve with nine being the average in last while until the 34.0 Betas. For Aurora which now currently called Developer Edition has checkins almost everyday so therefore there are updates each of those days.
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For Aurora you can look through http://hg.mozilla.org/releases/mozilla-aurora/
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How to calculate the disk failure level for a 3-way mirror pool?

On another post in this forum, the following information regarding a 3-way mirroring storage pool is given:
Pool requires a quorum of 50% plus drives to be present to survive.
with 3 way mirror - we have a guarantee of surviving 2 disk failure.
Maintaining the above requirements and providing the guarantee -
mandates us to have minimum 5 disks in pool. As if we loose 2, we still
have 3 in the pool (>50%) for pool to maintain it's quorum.
Just to be sure, I would like Microsoft to confirm that the following calculation applies to any number of disks in a 3-way mirroring pool.
If the number of disks in a 3-way mirroring pool is n, INT(n/2) disks can fail without data loss.
Examples:
With 5 disks, INT(5/2)=INT(2.5)=2 disks can fail.
With 6 disks, INT(6/2)=INT(3)=3 disks can fail.
With 9 disks, INT(9/2)=INT(4.5)=4 disks can fail.
Am I right in this assumption?
Thanks for your answer.

Hi,
>>Am I right in this assumption?
Based on my understanding, it’s not this case.
Mirror spaces are designed for increased performance and protect your files from drive failure by keeping more than one copy. Two-way mirror spaces make two copies of your
files and can tolerate one drive failure, while three-way mirror spaces can tolerate two drive failures.
Regarding this point, the following thread can be referred to for better understanding.
Storage Spaces - Disk resiliency
http://social.technet.microsoft.com/Forums/en-US/8f13ecf3-61c8-4505-90da-e8a01023c62d/storage-spaces-disk-resiliency?forum=winserverfiles
In addition, regarding storage spaces, the following article can be referred to for more information.
Storage Spaces Overview
http://social.technet.microsoft.com/wiki/contents/articles/15198.storage-spaces-overview.aspx
Best regards,
Frank Shen

Any basic differences between AT&T and Verizon, & other questions

I am thinking of buying an iPad mini with retina display (32gb). This would most likely be the only iPad I would ever own. I would use it mostly at the house with wifi, but would like to have one with cellular for when we travel in the US and Canada, and for when the electricity goes out. We currently live in a location where both AT&T and Verizon are viable options, but sometime in the next year we hope to move. The state is rural and mountainous, so as we drive around, my spouse's iPhone (with an AT&T plan) often loses service, but so does my Jitterbug phone, which is not tied to any one carrier (as far as I know). A phone can get a signal in one locaton, but then lose it a few feet down the road. So, there is no way I can choose between AT&T or Verizon based on coverage because both are options right now and there is no way to predict which one(s), if any, might provide service to wherever we end up moving to. Therefore, I'm wondering if there are any basic differences between AT&T and Verizon (or any other of the possible carriers) in what they offer or how they work or what they charge and so on that can help me decide which one to choose since it is my understanding that once I pick one of them for an iPad, that decision can never be changed without purchasing a new device. (e.g., I had read somewhere that Verizon does not allow for voice and data at the same time, but since an iPad is not a phone, is that even an issue?) Also, will the iPad work if there is only regular 4G or 3G service? And will a cellular iPad work without signing up for a data plan since I expect to start with only wifi and then add a data plan later? Thank you.

Alfred DeRose, Thank you for answering the second and third questions. Judging by what you wrote, I am assuming there are no differences between what AT&T and Verizon offer that affects iPads, other than looking at coverage area and the cost of "pay as you go" plans. And, as noted, coverage is not something I can base a decision on at this time. So, I either flip a coin to choose between AT&T and Verizon and hope the result is the right one after we move to wherever we end up finding a place to live, or I continue to wait for another year or more until we actually find a new house before I buy an iPad (or maybe a Kindle Fire HDX 8.9"to save money, but I think I've probably settled on an iPad mini retina 7.9" despite its smaller screen). That does not move me along the decision-making process at all, but it is what it is.
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Clustered Storage Spaces - 3 disk minimum for 2-way mirror?

Why will a 2 disk, 1 column, 2-way mirrored space work fine outside of a cluster? Yet, when I want to use clustered storage spaces I need a minimum of 3 physical disks for a 2-way mirrored space? Killing me...
I mean if I add 2 additional disks and do a 4 disk, 2 column, 2-way mirrored space it's ok. What would be the purpose of using 3 disks as a minimum?
Thanks,
Scott

Hi,
Could you please give us more detailed explanation to help us understand your question?
“Cluster storage space” did you mean “Cluster Share Volume” for Hyper-V Cluster?
What did you mean “mirrored space”, did you mean software mirrored volume? For a cluster, we recommend you use a shared storage and configure disk fault tolerance with hardware RAID.
Give us more information of your questions for further troubleshooting.
For more information please refer to following MS articles:
Mirrored Volumes
http://technet.microsoft.com/en-us/library/cc938487.aspx
How to Configure a Clustered Storage Space in Windows Server 2012
http://blogs.msdn.com/b/clustering/archive/2012/06/02/10314262.aspx
Understanding Requirements for Failover Clusters
http://technet.microsoft.com/en-us/library/cc771404.aspx
Hope this helps!
TechNet Subscriber Support
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Is there any audio difference

Is there any audio difference that is better in dvd studio then there is in idvd if you were to put the same project in both, I am just talking about regular music or soundtrack or audio from a shoot.

iDVD is limited in its audio options, with DVD SP you can make audio AC3 which is a compressed audio format (and more compressed than iDVD audio). That being said for many things AC3 is going to be fine to use and helps with compatibility by reducing bandwidth taken up by audio.
Think of it this way, when you listen to an aif file as oppossed to an AAC from iTunes you may here some differences, but it will depend on what is on the track and the encoding rates for the track.

Jumpstart/ZFS - mirror any any uses two slices on the same disk

Hi all,
I am setting up a set of custom Jumpstart profiles for a Solaris 10 10/09 SPARC install server. I am attempting to set up ZFS mirrored root filesystems using part of the two root disks (reserving the remainder for a second ZFS pool for application data). To achieve this, I have been using "mirror any any" as the device list for the pool directive in the Jumpstart profile
On my test system with 73GB disks I've had no problems, but testing against a new server with 146GB disks the installer seems to be putting both halves of the mirror onto the same disk - I presume because the root pool size is less than half the size of the disk, and so it can.
Is there any way to specify that the root pool should be mirrored across any two distinct disks, or any other advice on how to avoid this happening? I know I can specify exact slice names (i.e. "mirror c1t0d0s0 c1t1d0s0"), but some of the servers will have FC cards in, and so I can't guarantee what controller number the internal disks will be on.
As an example, here is a line from the rules file, and the associated profile (the start/finish scripts are currently only displaying information).
rules
====
arch sparc && memsize 4000-4200 begin_settings.sh sparc_4G_zfs lmu_setup.sh
sparc_4G_zfs profile
===============
install_type initial_install
system_type standalone
cluster SUNWCXall
pool rpool 30g 4097 1g mirror any any
Thanks,
Dave Taylor
Senior Infrastructure Consultant
Leeds Metropolitan University

Hello Dave,
I would expect that the profile you supplied will result in two slices off the same 146G disk to be selected for both sides of the mirror. If the numbers you had used for poolsize/swapsize/dumpsize had been smaller, you would would have had the same behavior on the 73G disk as well.
In short, when you say 'any', you are basically saying "I don't care where it goes, give me the first slice/device that works". So, with the 'any' in the first position, kernel probe order is used, so in this case the first disk is selected, and the zpool is created. With 'any' in the second position, again the first disk is found, with available space, the mirror slice is created.
If you want the two parts of the mirror to be on different devices, either alter the numbers for poolsize/swapsize/dumpsize in your profile so you cannot get both on the same disk, or don't use 'any' for the mirror vdev.
Again, if you use 'any', you are saying "I don't care". If you do care, don't use 'any'.
Channing

Any major differences of exadata database, listener, processes than regular RAC environment?

I would like to ask for any input regarding any major differences of exadata database, listener, processes than regular RAC environment.
I know now the exadata not only have SCAN listener, but a lot other listeners. can expert here provide more details?
Thanks

We will use zfs to do backups, is that possible for the initiband listener to communicate with ZFS? where I can find documents for zfs?
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Plus how do I know we have exalogic? I dont think we have one, but is there a way to check to be sure?
Exalogic is another of Oracle's engineered systems. It contains integrated compute, network and storage - similar to Exadata - but is used for running application environments, specifically for fusion middleware (e.g. Weblogic) applications, instead of databases. It uses a ZFS storage appliance for the storage, as opposed to the storage cells on Exadata, and for virtualized environments uses the Exalogic Elastic Cloud software. You would know if you have one.
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My macbook pro no longer connects to my TV with the mini dvi to hdmi adapter. A while ago the computer fell down and hit the cable. How can I tell if the computer is working ok. Doesn't show mirroring any more.

My macbook pro no longer connects to my TV with the mini dvi to hdmi adapter. A while ago the computer fell down and hit the cable. How can I tell if the computer is working ok. Doesn't show mirroring any more. Was working while watching a movie but when I pulled it out from the computer and put it back in the system would no longer mirrorr the screen on the TV.

The best option is an appointment at an Apple store genius bar. The evaluation will be for FREE!
Ciao.

Is there any performance difference in the order of columns referencing index?

I wish to find out if there is any performance difference or efficiency in specifying those columns referencing index(es) first in the WHERE clause of SQL statements. That is, whether the order of columns referencing the index is important???.
E.g. id is the column that is indexed
SELECT * FROM a where a.id='1' and a.name='John';
SELECT * FROM a where a.name='John' and a.id='1';
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Please advise. Thanks.

There is no difference between the two statements under either the RBO or the CBO.
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Table created.
sql>create index a_index on a(object_id);
Index created.
sql>analyze table a compute statistics;
Table analyzed.
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2    from a
3   where object_id = 1
4     and object_name = 'x';
COUNT(*)
        0
1 row selected.
Execution Plan
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   3    2       INDEX (RANGE SCAN) OF 'A_INDEX' (NON-UNIQUE) (Cost=1 Card=1)
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2    from a
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COUNT(*)
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1 row selected.
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Any speed difference between Apple Wifi Router(air express) and Tp link(or others) wifi router)

Any speed difference between Apple Wifi Router(air express) and Tp link(or others) wifi router?
I'm using a tp link router and sometimes it takes a long time delay for my 2 mac computers to connect each other. I don't know this is because of the router compability or the computers.

Anyone knows?

Three-way mirror disk requirement

In Windows 2012 Storage Space, why 3-way mirror requires minimum 5 disks instead of 3? How does 3 way mirror works? I tried to find the tech paper on MS website but either I didn't try hard enough or the info is not there.

Hi,
The reason is that a 3-way mirror uses a quorum. In order to keep running, the mirror space must keep over 50% of the disks functioning. So a 3-way mirror must have at least 5 physical disks to be able to survive the loss of up to 2 physical disks.
For more detailed information, please refer to the links belwo:
Tip Of the Day: 3-way Mirrors
http://blogs.technet.com/b/tip_of_the_day/archive/2013/08/29/tip-of-the-day-3-way-mirrors.aspx
mirror in storage pool
http://social.technet.microsoft.com/Forums/windowsserver/en-US/2e6955b7-b293-4880-8fb3-8b4ce0e02ec9/mirror-in-storage-pool?forum=winserver8gen
You could also refer to the article below to know more about three-way mirror:
Windows Server 2012 SMB 3.0 File Shares: An Overview
http://www.petri.co.il/windows-server-2012-smb-3-file-shares.htm
Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Regards,
Mandy
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are trying to better understand customer views on social support experience, so your participation in this
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Ever since updating my iPad with the iOS 8 and 8.0.2 it has been much slower in every way. Any suggestions besides restoring to last iOS?

Ever since updating my iPad with the iOS 8 and 8.0.2 it has been much slower in every way. Any suggestions besides restoring to last iOS?

Hi Arianelleangel,
Welcome to the Support Communities! If you are having issues trying to update your Aunt's iPad, the troubleshooting steps below may help:
Resolve issues with an over-the-air iOS update - Apple Support
Update does not complete
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If the update never completes and the progress bar hasn't moved for an extended time, try restarting your device. If you still see the issue after you restart, see what to do if your device appears frozen or won't start.
I hope this information helps ....
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2 Way mirror via Storage Spaces using 2xJBODS

Looking to setup 2xJBODS connected to a cluster File Servers & use 2-WAY mirror for the pool. Its clear that w. a 2way mirror that it can only handle 2 drives failing before seeing data loss but is that 2 drives between both JBODS or is that 2 driver
per JBOD? Also I know that if 1 JBOD were to completely go offline that I would need a total of 3 JBODS in order for vms,etc to not be affected but what is the expected behavior. A jbod goes offline and we lose vms but data is not loss? Once the jbod
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if you are going to mirror the 2 of them yes
What are the resiliency levels provided by Enclosure Awareness?
Storage Space Configuration
All Configurations are enclosure aware
Enclosure or JBOD Count / Failure Coverage
Two JBOD
Three JBOD
Four JBOD
2-way Mirror
1 Disk
1 Enclosure
1 Enclosure
3-way Mirror
2 disk
1 Enclosure + 1 Disk
1 Enclosure + 1 Disk
Dual Parity
2 disk
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REF: Storage Spaces Frequently Asked Questions (FAQ)
Storage Spaces, JBODs, and Failover Clustering – A Recipe for Cost-Effective,
Highly Available Storage
This post is provided AS IS with no warranties or guarantees, and confers no rights.
~~~
Questo post non fornisce garanzie e non conferisce diritti

2 / 3 way mirror - any visible difference ?

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