Performance of SSD data store

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• Disc SSD data store unavailable after reboot

  I have a Kingston SSD drive installed in a Dell T620 SAS (Controller H710) basket bottom. It is configured RAID 0 (disk). Therefore, it is OK, and I created a data store using the full disc. It works very well in the virtual machine that it is assigned to you. However, when I reboot and look in the configuration of the storage is not there. I can add and it remembers. The bad news is that the virtual machine, it is affected to cannot start as long as I add back in manually.

  A look at the list of devices, it shows that mounted. The difference between it and other readers is it says unknown partition format, it also says non - ssd.

  I'm just against a unit of failure in charge here? I do not see the SSD drives listed in the list of supported devices, but I hardly find this page.

  < small mug shot >

  Why he let me a second hard drive configured to use the rest of a store of data and then not start because there is not enough room for the Swap and not remove the second disk hard when I tell him?

  < / small rant >

  Hi Lou

  Why do not connect you to a port SATA (my last one)?

  This seems to fix. Also, he appeared as an SSD and remembered all the stuff.

  I guess it has to do with the SAS/RAID connection. Will try another drive to be sure.

  Lou

• Time range of statistical performance data store

  When I look at the performance of the data store tab in the performance monitor what time slot is used to generate the statistics?

  Hi Michael,

  The time slot is for 24 hours.

• Unable to download the file to the data store

  Hello

  Can someone help me on this, I'm trying to download a file to the local data store on the esxi host, but its failure

  used as below

  $ds = get-data center 'test ' | Get-file "CISCO UCS B200 M3 | Get-VMHost | Get-Datastore "datastore."

  $destination = "\".

  $source = "D:\All Cisco\ENICandFNIC readers for UCSver2.2.C\updated drivers" - this folder

  New-PSDrive-location $ds - name VimDatastore - PSProvider ds-root $destination

  Set-Location ds:------.

  Copy-DatastoreItem-point $source - Destination $destination

  What error messages you get? When I run your script, only an empty folder is performed on the data store. When you add "-recurse" it also copies child items (files and directories)

  $ds = Get-Datacenter "test" |Get-Folder "CISCO UCS B200 M3"|Get-VMHost |Get-Datastore "datastore*"
  

  $destination = "\"
  

  $source = 'D:\Test ' # -- this folder
  

  New-PSDrive -Location $ds -Name ds -PSProvider VimDatastore -Root $destination
  

  Set-Location ds:\ New-PSDrive -Location $ds -Name ds -PSProvider VimDatastore -Root $destination
  

  Copy-DatastoreItem -Item $source -Destination $destination -Recurse
  

  But it's only 1 data store, if I understand your example, you are trying to copy to different data stores. This could easily be done like this:

  $DS = Get-Datacenter "test" |Get-Folder "CISCO UCS B200 M3"|Get-VMHost |Get-Datastore "datastore*" | select name,DatastoreBrowserPath
  

  $source = 'D:\Test ' # -- this folder
  

   foreach ($datastore in $ds){
  

  Copy-DatastoreItem -Item $source -Destination  $datastore.DatastoreBrowserPath -Recurse
  

  }
  

• Question about the replica data store

  I am set up a plan view and I can't find anything on the lines how much I should put on a data store. We have a pretty small environment with approximately 120 related clones.

  Can I create pools of 5 to 10 for all use the same data replica store? I don't want to have all these little datastore who chew on the SAN iSCSI connections. It would be easier to have a data store that is easy to move all replicas.

  Thank you.

  Yes, you can store several replicas to a data store.  It is often considered to be best practices in order to unload the aftershocks of a SSD data store.    I just would make sure that the data store can handle IO reading for all replicas.

• Clone &amp; new Config on the different data store

  Hi all

  I had a problem where the user try to clone or create a new configuration where the original VM model are stored is full.

  When the data store is almost full, I turn off the "VM creation" in the section resources, I would do this or the LM will be able to use the different data store? otherwise how can I config for the user can store data different from Julie then create a new configuration or a clone.

  Thank you

  Error message here: -.

  * "Clone VM" operation cannot be performed because the data store 'VMFS02' is not

  Enabled.* yes I disable 'VM Creation' resources because of this LUN is almost exhausted.

  In this case, you must use SSmove to migrate the entire tree of virtual machines from a store of data with more free space

• ESXI 6.0, problem of data store local ssd

  Hi all,

  I have a desktop pc (HP Elite 8200), i7 cpu, 1 x 250 GB HARD drive, 1 x 240 GB SSD... (240 GB do datastore with name SSD), there, installed free VMware ESXI 6.0 on 250 GB HARD drive.

  Yesterday to buy second SSD 240 GB, I want to increase datastore 'SSD' with the second disc, but the process is hang. No warning, no error... but can extend the data store. Trying to

  create the new datastore with second SSD, but still hang processes. Maybe someone has a similar issue?
  

  I try to change SATA cables - does not work for me, try to detach an SSD - works for me... Finally reinstall ESXI 6.0 U1 with ESXI 6.0 U2 - this work for me.

  successfully create datastore with 2 x 240 GB Kingston SSD.

• Cannot display tables of performance of ESXi 4.1 data store

  Using Vcenter, I select the tab performance on each host ESXI4.1. I can view a chart for reading of data store and the latency of writing in real time. However, if I select any period other than in real time, the array is empty.

  Others for example CPU performance measures work well in real time and measures 24 hours a day.

  I have to be able to measure the reading of the data and store latency of writing on at least a 24-hour period. Someone had this problem?

  Examples shown in attachemnt.

  Hello

  Try to change the statistical level in 3:

  go to Administration - vCenter Server Settings - statistics and change the statistical level to 3

  wait for a while and check the historical performance, don't forget, change it back when you did with analysis

  See you soon
  Artur
  

  Please, do not forget the points of call of the "useful" or "correct" answers

• Performance of copy of local data store

  Hello

  I'm trying to copy the vmdk to a data store (first physical disk) to another store of data (second disk on the same machine) with vSphere Clinet Datastore browser. Performance is horrible: 3000 kbit/s. This behavior is normal? I'm getting much better speed while copying the file to the browser to store data http through LAN to my laptop. Read/write in the management of the virtual computer is also correct.

  Virtual machines are all stop, ESXi is in maintenance mode. The server is an HP Proliant ML150 G6.

  Thank you

  USY

  is the local section of the disks has any controller cache battery sustained writing?

• [Performance] Data store Virtual disk LUN or a raw device

  We try to find the solution the faster for one of our internal systems.

  Currently, we have a data store that is located in a SAN iSCSI via a virtualdisk file.

  Since we want to benefit the maximum of iSCSI SAN configuration, we want to know what solution is faster:

  -Via the data as virtual disk (diskfile) store

  -Via direct LUN mappingl (mapping RAW)

  I searched the documents, but it is impossible to find the figures/numbers how much performance gain, we would be able to get.

  Us don't use clichés (and do not use then as well), and what other pinpoints should I also everything by making the decision to change the architecture?

  There may be some performance improvements, you can do in your env, but they come from VMDK of RDM.

  -Matt

  VCP, vExpert, Unix Geek

• Performance data from the data store

  Tab performance one shop data if I select < Performance > in the drop-down list [see] I see several graphs.  My problem is that most of them specify 'no data available '.

  Is there a switch I need to market or a driver that needs to be installed so that these measures to collect?

  Thank you

  It may be a problem of 5.0U1 - I wrote something about it to http://rainbow.chard.org/2012/04/23/restoring-datastore-performance-graphs-after-upgrading-to-vcenter-5-0u1/.  There is also a KB on this subject, but the procedure is quite complex, so I wrote a portico.

• Second data store for the shared virtual machine

  IM thinking about to migrate my existing VMWare Server 2.x to VMWare Workstation 8.

  My server is a machine selfbuild W2k8 with Core i7, 24 GB of ram, an SSD for the OS and two 500 GB HDDs. Due to performance issues an VM is placed on a separate HARD disk. I want to keep the configuration like this.

  At the time where I'm using a trial version of WS8 and may not know how to set up a second datastore for shared virtual machines on a second hard drive. Is this possible at all? Or y at - it an alternative to solve this problem? Creation of a RAID0, isn't my favorite option.

  Thanks for the reply.

  It is not implemented by using a second data store for shared virtual computers.

  Workaround solution:
  Suppose you have the original data store C:\vms and a second D:\vms

  then create a junction for each directory in D:\vms like that

  C:\vms\VM1 D:\vms\VM1 junction.exe

  C:\vms\VM2 D:\vms\VM2 junction.exe
  ....

  then the vmx files from doubleclick in C:\vms\VM1 and configure the virtual machine to share.

  On Windows 7, use mklink.exe instead
  On Linux hosts use ln

• ESXi 4.1 reinstall without loss of data in the system data store

  Hello world

  because of incorrect tape device configuration (see more low http://communities.vmware.com/thread/289847?tstart=0), I have to reinstall Esxi 4.1 in the same place where the system partition is also home to the Oracle data disk (I didn't have the choice because the system starts on the table of great raid with SSDS, there was no such thing which allow me to pre partition the RAID disk into several partitions and choose) only a small partition to install ESXi files), what happens if I reinstall ESXi with the method of "REPAIR"? will be large files within the system data store destroyed or intact?  Help, please.  Any suggestions are greatly appreciated.

  When you do a normal installation of ESXi, the whole installation drive is wiped regardless of the existing partitions that exist.  With a repair only install ESXi system partitions are left.  Any data store must be perserved and after the repair, you can save any virtual machines that were welcomed on this data store.  If the repair not proceed with the installation (for example, if the data store exists in the first 900 MB of storage), then you will get a warning in this sense and a new facility (wipe the entire disk) is performed.

  So with a repair, you should be fine, but I want to take a backup without worrying.

  Dave

  VMware communities user moderator

  Now available - vSphere Quick Start Guide

  You have a system or a PCI with VMDirectPath?  Submit your specifications to Officieux VMDirectPath HCL.

• Good way to use the concurrent data store

  Hello

  I'm developing a multithreaded C++ application that uses the C++ of Berkeley DB Library.

  In my case, I have several databases that I composed in a wooded area. It is important for me to use an environment because I need control over the cachesize parameter.

  I don't need no guarantee of transaction and have for most of the readings, so I decided to use the "simultaneous database.

  I first pre-fill all databases with a number of entries (configuration single-threaded phase) and then work on it at the same time (for most readings, but also insertions and deletions).

  I tried all kinds of different configurations, but I can't work without specifying DB_THREAD as a flag of the environment.

  I don't want to because then access all handles is synchronized sequentially according to the documentation:

  "... Note that the activation of this indicator will serialize calls to DB using the handle between the threads. If

  simultaneous scaling is important for your application, we recommend handles separate for each thread opening

  (and do not specify this indicator), rather than share handles between threads. "

  (Berkeley DB QAnywhere C++)

  So I tried to open the environment with the following indicators:

  DB_CREATE | DB_PRIVATE | DB_INIT_MPOOL | DB_INIT_CDB

  All data in this environment handles are open only with the DB_CREATE flag.

  So, since my understanding this same basic access handles need to be synchronized, I opened separate handles foreach database for each thread (opening the handles is still single-threaded).

  In my first approach, I have only made use of the object of global environment. Which does not work and gives the following during operations error message:

  DB_LOCK-> lock_put: Lock is no longer valid

  So I thought, since the same handle global env is passed to all handles separate DB, it is perhaps a race condition critical on the handful of approx.

  So in my next test, I opened also handles separate EPS in each thread (and db handles owned each).

  That does not produce an error in db, but now it seems that each thread sees its own version of the databases (I call it stat early in the life of each thread and he sees all of the empty dbs).

  What is the right way to use the concurrent data store? Each thread should really open his own set of db handles? What about the number of open handles env?

  PS: Without specifying that the DB_PRIVATE flag seems to do the job, but for performance reasons, I want all operations to perform in the cache and do not specify product DB_PRIVATE average of several writes to the disk for my scenario.

  Thanks a lot for your help.

  CD (simultaneous database) allows a single editor with multiple drives, access to the db at a given point in time.    The handle for the writer doesn't have to be shared with readers.   If you share the DB handle then calls are synchronized, but if each thread has its own handle DB then this is not the case.     Since you have an environment, DB_THREAD must be at the level of the environment.   This will allow the sharing of the environment handle.     This type of error "DB_LOCK-> lock_put: Lock is no longer valid" you can provide us your code so we can take a look.   Also what BDB version are you using?

• ODI file data store

  Hi all

  I have a confusion about the physical and logical length in the ODI file data store.

  I have a fixed-width file where a c2 col had datatype as string (30).

  I've set this column in the data as string store > physical length 30 > logic length 30

  My interface failed with error as '.

  ORA-12899: value too large for column 'S0_IDM '. «C$ _0S0_EAGLE_DWHCDC_CHRG_MST ".» "" "C2_CHARGE_DESC" (real: 31, maximum: 30).

  When I increased the logical length to 255, the interface worked fine.

  Being always the same 30 physical length.

  How different is it?

  Any help on this will be appreciated.

  Thanks and greetings

  Reshma

  This isn't the official documentation, but here's my point of view, after a few moments of reflection

  Everything you do in the ODI Designer is inspired by the logical architecture. Only when running it manifested in a physical implementation i.e. connection strings are materialized etc. When you perform an integration ODI creates usually a few temporary tables prefixed with C$, I$ etc to be able to perform the necessary data movement and the transformations needed to, for example, to fill a data target (table) store. In your example, your flat file is materialized in such a temporary table before that its content is manipulated (or not) and loaded in the target data store. When ODI generates this code that he uses the logical length emitted in the DDL that generates temporary table column lengths, the physical column is ignored.

  Now in your scenario is not a problem as constraints such as these do not matter to the physical file version knowledge if you were to write to the file, that it would not matter if you wrote return 255 characters or 31. This could be a problem if you were using database tables and varying the logical vs physical lengths but generally you reverse engineer tables from database using ODI rather than manually doing so makes better.

  Anyway, in short, I think that the logical lengths should be taken as representative which will manifest itself in the materialization of the temporary objects used to manged / transform the data from the source models (tables$ CAN) and target (I have tables$) while the physical lengths indicate what the underlying physical representation of these models are in reality.

  EDIT: after reading some logical documentation actually represents the length while physics is related the number of bytes required to store the data. Therefore, you could have a situation with multibyte characters where the physical length could be greater than the logical length but not really the other way around.