The merit of multiples of VHDs
When you set up a new virtual machine is no basis to the addition of several virtual hard drives (for example one for the files of the OS and the other for the application/data files) instead of creating a large virtual hard drive? I always physical servers for installation with a set of disks for files of the OS and another set of discs with data files for reasons of redundancy and paging IO. With discs hard virtual these advantages still apply?
Here are some reasons I used disks separated instead of partitions or drives big one
- Management
- Easier to grow records
- If all partitions are on the same disk, it is more difficult to add space.
- Windows 2008 supports this on the fly for ESX 4.x (and probably for other operating systems)
- If all partitions are on the same disk, it is more difficult to add space.
- If your data store fills (it happens when you least expect it. usually caused by another admin while you were on vacation) it is easier and faster to move the small disks for out you of the mess faster
- Easier to grow records
- Performance
- You can move your highest workloads to different LUN IO or other type of storage iSCSI/NFS/fiber and leave your OS partitions on different types of storage
- Backup
- You might want to just the OS partition or partition to backup data
- You can only restore the operating system or restore data partition
- You might want to only replicate the replication data partition
- Architecture
- To get the best use and performance absolute dedup NFS and data as a NetApp, there are some suggestions that some types of data (Exchange/Application/OS file put there own volumes) be on the Netapp. http://media.NetApp.com/documents/tr-3428.PDF
Reason not to:
- Disaster:
If for any reason your vmx file is damaged or is missing. It can find all the disks that make up your virtual machines difficult and understand what order they must go hand in hand. (if you have a backup of the vmx file and virtual machines this is not a problem)
- MRS. Usually LUNS are replicated for RS, but I have not implemented SRM and this may have changed since I had not really looked at him for everything. If you distribute you on different LUNS vmdk files then it may not work for MRS.
- Space if thick you are supplying, then you would probably better use out of space in a more vmdk file and then smaller. If you Thin provision is not really much of a factor.
In general I VMs to create an operating system partition and a partition of data (aligned) on the same data store. If there is reason to move them, I do. It is above all the simplicity of the expansion of the virtual machine storage. If several drives are necessary (SQL, Temp/newspapers/backup/data) I have just create individual records for each. Even if you have multiple disks, you can manage them all VM level.
There is very little downside to multiple discs
Hope that helps
-Rich
Tags: VMware
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ValueExtractor salExtractor = new PofExtractor (Integer.class, 2);
ValueExtractor depExtractor = new PofExtractor (String.class, 3);
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cache.addIndex (mExtractor, false, null);
But how can I use the extractor to create multivalued filter queries for employees in the Department of human resources with greater than 35000 salary? Any ideas are much appreciated.
Thank youD wrote:
Hi guys,.Trying to assess the benefits of the addition of index of multiple values, a quick question on the index of multiple values:
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(8, new employee (36, 35000.0, "HR"));
(9, new employee (46, 45000.0, "Admin"));
(10, new employee (48, 47000.0, "HR"));If I still want to find all employees in the 'Human resources' Department and whose salary is more than 35000.
Eventually, I would like to do the following:
ValueExtractor salExtractor = new PofExtractor (Integer.class, 2);
ValueExtractor depExtractor = new PofExtractor (String.class, 3);
cache.addIndex (salExtractor, false, null);
cache.addIndex (depExtractor, false, null);EqualsFilter departmentFilter = new EqualsFilter (depExtractor, 'HR');
GreaterFilter salFilter = new GreaterFilter (salExtractor, 35000);
Filter allFilter = new AllFilter (new filter [] {departmentFilter, salFilter});
Employees value = cache.entrySet (allFilter));For my usecase above how can I use the indexing of multiple values to the same query?
ValueExtractor salExtractor = new PofExtractor (Integer.class, 2);
ValueExtractor depExtractor = new PofExtractor (String.class, 3);
MultiExtractor mExtractor is new MultiExtractor (new ValueExtractor [] {salExtractor, depExtractor});.
cache.addIndex (mExtractor, false, null);But how can I use the extractor to create multivalued filter queries for employees in the Department of human resources with greater than 35000 salary? Any ideas are much appreciated.
Thank you
I remember, values multiple index refers to a different concept: a multivalued index means that you can retrieve a collection of values of similar role of an attribute on which you can do Contains, ContainsAll filtering, and ContainsAny.
In this case to fully the lever consistency of querying capabilities, you would
- either add a sorted index with a custom comparator that compares the tables containing a salary and a Department on a first salary so the base of the Department and add a filter custom which is able to take advantage of the index for the request for the salary and also able to filter on the element of the array of index service
-Add two independent indices (a sorted index of wages and a unsorted for the Department), in which case you can leverage all existing (GreaterThanFilter, EqualsFilter and AndFilter) codeBest regards
Robert
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