Snapshot where created equal

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  Hi experts,
  
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  id    amount
  
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• Not all JMS consumers are created equal

  Hello
  I am facing a very strange problem with weblogic 9.2 JMS.
  
  I use JMS as flow of control in an application that allows our users to import data in our application.
  the data to be imported range in size from hundreds of files to several hundreds of thousands of documents.
  
  JMS feed an MDB that accepts demand and imports the data. The DD allows 10 competitor MDB to process applications.
  
  The problem arises when the request 11' e and 12 times. Rather than wait the first availibe MDB to process applications as they seems to be put in the queue of the MDB that started first. If this MDB is importing a very large file request, 11 and 12 will sit and wait until the grand is even if there are other MDBs that are inactive.
  
  I hope that there is an easy solution for this, but for the life of me, I can't seem to find it.
  
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  -------------------------------------------------------
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  -----------------------------------------------------
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  Kind regards
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  Compost Marketing AB CTO.

  Have you tried setting MessagesMaximum on the factory connections to 1?

  http://download.Oracle.com/docs/CD/E13222_01/WLS/docs92/perform/jmstuning.html#wp1149750

• Script to determine who created a snapshot

  Hi all

  I have the following script, I need help to add code to determine who created the snapshot.

  Get - VM | Get-Snapshot | Where {$_.} Created - lt (Get-Date). AddDays(-2)} | Select name, creation, VM, SizeMB

  Try this,

  Get - vm | Get-vievent | WHERE-object {$_ .fullformattedmessage - like ' * snapshot * "} | Select-object @{N = "VM"; {E = {$_.vm.name}}, username, FullFormattedMessage, Createduserid

  It will signal you the snapshot so delete event.

• PowerCLI script delete/create the snapshot in ESXi5.5

  Hello

  Last week, I upgraded one of my host of esxi5.1 to 5.5

  everythink works exepted one of my script powerCLI.

  On my host 5.5, I can't throw a snapshots of delete/create:

  Remove-Snapshot: 14/11/2013-13:45:37

  Remove-Snapshot

  Current permit

  or version ESXi prohibited the execution of the requested operation.

  At line: 1 char: 92

  + Get - VM | Get-Snapshot | Where {$_.} Created - lt ((Get-Date).) AddHours(-46))} | R

  eMove-Snapshot < < < <-confirm: $false

  + CategoryInfo

  : NotSpecified: (:)) [delete-screenshot], RestrictedV)

  ersion

  + FullyQualifiedErrorId: Client20_VMServiceImpl_RemoveSnapshot_ViError, VM

  ware.VimAutomation.ViCore.Cmdlets.Commands.RemoveSnapshot

  A feature has been remove en 5.5?

  Thank you

  I guess that's not possible. This has already been discussed in communities. Please take a look at this thread. https://communities.VMware.com/message/2211533

  ~ dGeorgey

• Snapshots created with the EqualLogic VSS provider are not displayed in SAN HQ

  Hello

  Poster for the first time. We have just implemented an EqualLogic SAN, PS6100X network, and we're having performance issues between our DPM backup server, one of our hosts Hyper-V and VM images stored on the San. I will try to provide as much information as I can

  Environment:

  Dedicated iSCSI using Dell Force10 switches network

  hyper-V (Windows Server 2008 R2) 3 hosts
  -2 hosts has a NETWORK 4 port GB dedicated adapter connected to the iSCSI network; 1 host has connected to the network iSCSI NETWORK 2 GB dedicated ports card
  -Each Hyper-V host computer has a dedicated on the EQ SAN, RAID-50 volume that stores the Hyper-V virtual machines
  -EQ VSS provider installed on all hosts Hyper - V 3 and works correctly

  Using DPM 2010 for backup

  Problem: on Hyper-V hosts 1 and 2, any/all backup activities are very slow. On the Hyper-V host 3rd, however, activities related to backup all are incredibly fast! We compared the NIC configurations, HIT / settings ME and ASM, but we cannot understand why it is so slow on hosts 1 & 2.

  In addition, whenever DPM 2010 tells the EQ VSS provider to create a snapshot, we see the snapshot being created in the EQ Team Manager, but he does not appear in the list of iSCSI connections. According to the documentation SAN HQ, instant and volumes should appear here.

  We also disabled TcpAckFrequency for all 3 hyper-v hosts. It helped a little, but there is still a HUGE difference with regard to backups of the DPM.

  We're pretty sure that there is something misconfigured on the hosts Hyper - V 1 & 2, given that the host Hyper-V 3 has no performance issues.

  How can I get snapshots to appear in the list of iSCSI SAN HQ connections?

  Version information:
  SAN AC = 2.2.0.5924
  Storage Array Firmware = 5.2.4

  There are two different issues in this post for the SANHQ doesn't show only not iSCSI connections.

  Now SANHQ displays the correct total connection number but doesn't provide details of connections individual iSCSI for snapshots, which it should. So in the meantime use Workgroup Manager that shows the details for each snapshot (I know that's not the best answer, it's a short term solution).

  The fact the SANHQ shows details of instant connection does not mean that they aren't here and I can't imagine anything to do with the question of the DPM.

  The real difficulty, look for upcoming beta SANHQ and subscription for this on the EQL support site. You can do it now.

• Create the snapshot on VCenter VM during the process of upgrading to VCenter 5.1?

  People,

  My VCenter server is a virtual machine running on the host ESXi number 01 (I've nailed specifically using the DRS rule), so it is desirable to take snapshots for VCenter Server VM during the upgrade process?

  What happened when the upgrade process has failed? can I safely restored the snapshot?

  When the snapshot is created before the upgrade, it means that the snapshot will be the safe state of the VM, vCenter and SQL in your case. But if you can make a backup of database to an external location.

• standby of the comments file system create two snapshot files

  Why would or should suspend the comments file system create two snapshot files.

  In our environment, we have the following VMDK.

  Syntest.VMDK

  Syntest_1.VMDK

  Syntest_2.VMDK

  Syntest_3.VMDK

  Syntest_4.VMDK

  When I create a snapshot that suspends the comments file system it creates two syntest_1 - 000001.vmdk and syntest_1.000002.vmdk (as well as all of the files for snapshots).  Here is a screenshot.

  

  Why and is at - it something wrong?   I can find a ton of articles on stereotypes, but nothing that speaks.

  We are currently on ESXi 5.1.0,1157734.

  Thank you

  Mike

  Out of curiosity. Are two snapshots created even when you create the snapshot manually?

  With backup applications, this behavior is not uncommon. The first snapshot is created for the virtual machine write them changed data, while the current is/instant backup, and the second snapshot is created by the backup software to attach the virtual disk basic to the host/proxy backup as "independent - not persistent. Once the virtual disk is disconnected from the proxy the second snapshot will be discarded and then the first snapshot will be validated for the basic disk.

  CBT information should not be reset somehow, but updated as changed during the backup data.

  André

• Failed to create snapshot... file is larger than the size max...

  I'm getting the "file is greater than the maximum size supported by the store of data... »

  I read the KB figure I can move the. VMX file to another data store to get the snapshot to work.

  But I'm having a hard time understanding why this is happening.  I want to avoid this in the future.

  My data store is 67,50 GB of capacity, with 16.92 GB free.

  Block size is 1 MB.

  I understand that 1 MB BS may comprise a maximum of 256 GB.

  Could someone please explain in English how Vmware is the calculation that the 16 GB of free space is not enough?

  Please be nice

  Thank you.

  Yes, that is the question, 272 GB is too large for the size of block 1 data store MB. Front of vSphere 5, all snapshots are created in the home of the virtual machine folder by default. With vSphere 5, this has changed and now snapshots are created in the same folder as the virtual disks from their parent.

  André

• How to create the snapshot to the remote data store?

  Hi all.

  I have esxi 4.1 now if I run the snapshot in the snapshot file created on the host server, but I want to create the file snapshot directly to remote NAS. Can I do this?

  Thanks in advance.

  best account.

  Dan.

  check this, you can set a different location of snapshot: http://blog.vmpros.nl/2009/05/14/vmware-creating-snapshots-in-a-different-location-than-default-virtual-machine-directory-1002929/

• Once a snapshot has been created?

  Hi all

  I'm looking for a command that can tell me when a snapshot was created.

  Can someone help me?

  Olivier

  You get property created

  Get-Snapshot - VM (Get-VM-name "VMName") - name 'Nom_snapshot ' | Select name, created

  or

  $CreateTime = (get-Snapshot - VM (Get-VM-name "VMName") - name "Nom_snapshot"). Created

  Josh Atwell

  http://day2dayadmin.blogspot.com

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• Question about Equallogic snapshots.

  Hello forum

  I could not confirm this, but instant never need to commit anything to the basic volume?

  Lets say I have 10 snapshots and delete the oldest? There will be a load of e/s to validate these instant changes?

  Also, if someone could point me to any type of indepth explanation of this technique of snapshot, I would be interested to read all that.

  Thank you!

  N ° current data are already on the base volume.  There is nothing to commit.   Only if you are completely restoring a volume from a snapshot will be there in writing for the base volume.

  On the site of Equallogic Support KB:

  Solution title TABLE: how the snapshot reserve space is allocated and used

  Solution details Snapshot Reserve Allocation and use

  -------------------------------------

  In a series group PS, snapshots can protect against errors, of a volume

  virus or the database. A cliché represents the content of a volume

  at the time you created the snapshot. Creating a snapshot does not disturb

  access to the volume, and the snapshot is instantly available allowed

  iSCSI initiators.

  Before you can create snapshots for a volume, you must allocate space (called

  snapshot pool) for snapshots. You set the value of the snapshot reserve

  When you create or modify a volume. Snapshot reserve benefits from the same

  as the volume of the pool data.

  When snapshot data consume entire supply snapshot, the Group remove is

  the oldest snapshots to free up space for new images or sets the volume and

  snapshots offline, according to the policy you selected for instant recovery

  space.

  The functionality for creating snapshots is called hybrid allocate when writing.

  Operation of sharing and snapshot of the page

  -----------------------------------

  A PS Series Group organizes the physical storage into logical segments called pages.

  Each page is composed of several logical blocks. This is similar to the way file

  systems combine areas of physical disk in 'clusters' or 'chunks '. Each page has

  a reference count which records the number of volumes and snapshots that share

  the page.

  When you create a volume, the group creates an internal table, called the volume

  table, which contains pointers to pages that use the volume. When you create

  a snapshot of a volume, the group creates a snapshot table by making a copy of

  the volume table, which is usually an operation in memory that the Group

  run in a transactional manner. For each page of volume in use, the support group increases the

  reference count to indicate that the volume and the snapshot share page.

  Because the group does not move or copy the data or allocates a new pages, photos

  are fast and efficient.

  Reserve of the snapshot stores the differences between the data on the volume and snapshot data

  (in addition to differences between the data of multiple snapshots). When you

  first create a snapshot, the page for the volume and the snapshot tables are

  In brief identical copies and the snapshot consumes no snapshot

  reserve. A reading of the same logical block of the volume application or the

  snapshot returns the same data because the application is reading from the same page.

  However, if you write a page that has a volume and a snapshot of share, snapshot

  reserve is consumed.

  Here's a simplified example of a snapshot operation. In general, no.

  additional I/o operations are needed to manage the data volume or snapshot.

  However, other internal operations can occur due to virtualization and

  data balancing on berries of the PS Series.

  If an application performs a write to 8 KB for a volume containing a snapshot, the

  Group:

  1. determine what page is modified by the write operation.

  2 - If the page is not shared, writes the data to the page.

  3. If the page is shared:

  . (a) allocates a new page of disk space and reduces the instant to reserve

  . the volume of a single page.

  . (b) update the page of volume table to point to the newly allocated page.

  . (c) mark the newly allocated page as having new data on the volume and the references of the

  . original page for unchanged data.

  . (d) writes the data to the new page.

  When writing is complete, if you read the data on the volume, you have access to the

  new page and new data. However, if you read the same logical block of the

  Instant, you get the original data, because the snapshot will always point towards the

  original page. Similarly, if you set a snapshot online, write to the snapshot.

  feature hybrid write protects the original data volume by allocating

  a new page for the new snapshot data.

  Only the first page of writing to a volume shared (or snapshot) consumes additional

  snapshot reserve. Each subsequent entry is considered identical to a writing on a

  non-shared the page because the original data are already protected.

  Functionality similar to hybrid allocate when writing is used in cloning operations.

  However, unlike when you create a snapshot, cloning a volume immediately

  consumes space additional group. If a clone is moved to another pool, data

  is copied during the operation of moving pool.

  Restoring a Volume from a snapshot

  ----------------------------------

  Because of the layout table, restore a volume from a snapshot is very

  quick. First of all, the group automatically creates a snapshot of the volume by copying

  the volume table to a new table of snapshot. Then the Group transposes the page tables

  the volume and the snapshot you selected for the restore operation. NO.

  additional space is required, and no data is moved.

  Deletion of Volumes and Snapshots

  ------------------------------

  Because volumes and snapshots to share pages, if you delete a volume, you

  automatically remove all the clichés associated with the volume.

  You can manually delete snapshots (for example, if you need more of)

  snapshot data). In addition, the group can delete snapshots automatically in the

  following situations:

  1 - failure instant free reserve. If the snapshot data consume the snapshot

  . reserve, the group either deletes the oldest snapshots to free up space for new

  . snapshots or sets the volume and snapshots in offline mode, according to the policy

  . you have chosen for the snapshot space recovery.

  2 - maximum number of snapshots, created from an agreed timetable. If you set up a

  . timetable for the creation of snapshots, you can specify the maximum number of

  . photos you want to keep. Once the program creates the maximum number

  . clichés, the group will delete the oldest snapshot for planning

  . to create a new snapshot.

  Snapshot are deleted in the background queue. The group travels

  the snapshot page table and decremented the reference count on every shared page.

  Any page that has a zero reference count is released into free space. Pages

  with a zero reference count are not released because they are shared with

  the volume or other snapshots.

  Because stereotypes can be automatically deleted, if you want to keep the

  given to a snapshot, you can clone the snapshot.

  Reserve snapshots use agreement

  ------------------------------------

  The snapshot reserve is consumed only if you write a shared volume or snapshot

  page. However, it is difficult to establish a correlation between the amount of data written in one

  volume (or snapshot) with the amount of instant reserve consumed as a result.

  especially if you have multiple snapshots.

  Because the pages consist of several logical blocks, size e/s and distribution

  volume merge affect overall performance of e/s in addition to the snapshot

  reserve its use.

  For example, do much written about a narrow range of logical blocks in a volume

  consumes a relatively low amount of reserve of the snapshot. This is because as Scripture

  the same logic block more than once, does not require not additional snapshot

  reserve.

  However, doing random number wrote a range of logical blocks in a

  volume can consume a large amount of reserve of the snapshot, because many other

  pages are affected.

  In general, use instant reserve depends on the following:

  1. number of entries that occur in the volume (or snapshot) and at least one

  . snapshot exists. In general, more Scriptures tend to use more snapshot reserve.

  . Although multiple writes to the same logical block do not require additional

  . space.

  2 - the range of logical blocks, on which occur the Scriptures. Written in a wide range of

  . logical blocks tend to use more instant reserve written in a narrow

  . rank, because more of the written word are to different pages.

  3. number of snapshots of the volume and timing of the write operations. Most

  . snapshots that you create more snapshot reserve is necessary, unless there is

  . few entries on the volume or snapshots.

  4 - age of snapshot. Snapshots older tend to consume more snapshot reserve only

  . the clichés of recent because the group must retain the original data for a

  . longer time.

  Design Snapshot reserve

  -----------------------

  You cannot create snapshots until you book instant space. Snapshot reserve

  is set as a percentage of the reserve volume (space) for the

  volume.

  When you create a volume, by default, the volume uses instant group-wide

  reserve adjustment. (The reserve in the scale default setting is 100%. You

  can change this default value.) You can change the reserve snapshot setting when you

  create a volume or later, even if the volume is in use.

  Although the snapshot reserve is not used until the volume or writing snapshot occur, it

  is consumed immediately free pool space. For example, if you create a

  fully allocated (not thin provisioned) 200 GB volume and specify a snapshot of 50%

  pool of reserve, free space is immediately reduced to 300 GB (200 GB for the volume

  reserve and 100 GB for Snap reserve), even if there are no pages in use.

  Therefore, before you create a volume, you should consider how many snapshot

  reserves, if any, to assign to the volume. The reserve of the snapshot set to zero (0)

  If you do not want to create snapshots.

  The optimal size of the snapshot reserve depends on the amount and type of

  changes in the volume and the number of shots you want to keep.

  By example, if you set the snapshot reserve 100%, and then create a snapshot.

  You can write to each byte of the volume without missing snapshot

  reserve. However, if you create another snapshot and then write in each byte of

  the volume, the first snapshot is deleted in disk space available for the new snapshot. If

  you set the instant reserve at 200%, there would be a sufficient reserve of snapshot

  for the two snapshots.

  A very conservative strategy in terms of instant reserve sizing is to put the snapshot

  book value at 100 times the number of shots you want to keep. This

  guarantees that keep you at least the number of snapshots, regardless of the

  the number of entries on the volume. However, this strategy is generally allocates

  book an excessive amount of snapshot, because that rarely crush you all the

  the data in a volume during the lifetime of a snapshot.

  The best way to instant size reserves is to assign an initial value to the reserve

  and watch how instant you can keep over a period of time specified under a

  normal workload. If you use tables to create snapshots, allow the

  calendar of work for several days.

  To get an initial value for a snapshot reserve volume, you must estimate

  the quantity and the type of entries in volume and the number of snapshots, you want

  keep. For example:

  -If you wait a few Scriptures or writings which are concentrated in a narrow range

  . logical blocks and you want to keep only a few shots, start with a value

  . 30%.

  -If you wait several entries or entries that are random in a wide range of

  . logical blocks and you want to keep more than a few shots, start with a value

  . 100%.

  If the snapshots are deleted until you reach the desired number of snapshots,

  increase the percentage of snapshot reserve. If you reach the desired number

  shots without consuming much of the instant free reserve, decrease the

  percentage of reserve snapshot. Continue to follow instant reserve and

  adjustments as needed.

  How Thin Provisioning button Snapshot Reserve

  ----------------------------------------------

  The snapshot reserve is based on a percentage of volume reserve (allocated space

  a volume). For a volume fully provisioned, the reserve volume is equal to the

  stated volume size. However, a thin volume put into service, the volume of reserve

  is initially very inferior to the reported size (default is subject to minimum volume

  10% of the reported size) and increases as the written volume occur.

  If you change a thin volume supplied in a volume fully provisioned, the

  amount of reserved snapshot increases automatically, because the volume of reserve

  increase in the size of the stated volume.

  If you change a volume of fully provisioned to thin-provisioned, the amount of

  snapshot of reserve decreases automatically, because the volume of reserve declines.

  However, if the snapshot resulting reserves will be too small to store all the

  existing snapshots, the group will automatically increase the instant reserve

  percentage of value that preserves all existing snapshots.

  Reducing the use of instant reserve

  -------------------------------

  Over time, you can reduce the use of instant reserve by periodically (for example,

  Once a month) defragmentation of databases and file systems. Defrag operations

  try to consolidate segments of files in a volume and, consequently, to reduce the scope

  logical blocks addresses used in the pages of the volume.

  Defragment the data read operations from one place and then write data to a new

  location. So increased use of instant reserve during and immediately

  after defragmentation, because existing snapshots will use more of the usual

  amount of the snapshot reserve. However, snapshots created after defragmentation

  operation must use less instant reserve, because the data on the volume are more contiguous.

  When a volume is highly fragmented, potential reduction of the snapshot reserve

  use can be dramatic, especially after removing the large before you defragment

  snapshots. Defrag operations can also reduce the I/O load on the group,

  because the contiguous data makes more efficient i/o operations, in order to improve the

  e/s overall performance.

  Latest defragmenters are good to reduce the fragmentation that is not seeking to be

  too thorough. Some defragmenters also try to combine the inactive data

  further restricting the likelihood of changes to shared pages. However, are not

  Defragment too frequently.

  Sector alignment may also affect the use of snapshot of the space, especially in

  larger volumes. File systems must be correctly aligned with the sector. It comes

  described in technical reports for VMware and Windows environments.