May 2, 2019 Vignesh Sathiyanantham

Failure rate depends more on the number of disk blocks modified since the last snapshot of the EBS volume than the total size of the volume. EBS has a listed failure rate of 0.1% – 0.4% annually, compared to a commodity disk’s rate of 4%. At first glance, this appears to be great, but this is somewhat misleading as any real production setup will use some sort of RAID. Using a RAID 1 with two drives failing at 4% would give a failure rate of 0.16% annually, which appears to be line with EBS. As long as the failed drive…

April 12, 2019 Vignesh Sathiyanantham

To do some testing of the on going release of Nimesa which do the application aware ( AppAware ) Backup of Microsoft SQL Server Cluster on SQL 2016 i created a small powershell scripts which create ( actually restores ) the databases from Adventure Works backup file Change the total and volume drive letter in the below code and run it. If you want to have Data files (.mdf ) and Log Files (.ldf) in the same volume, set the volume1 and volume2 with same value If you want to create data and log files on different volume, set different…

April 10, 2019 Vignesh Sathiyanantham

PS C:\WINDOWS\system32> Set-ExecutionPolicy RemoteSigned PS C:\WINDOWS\system32> Set-PowerCLIConfiguration -InvalidCertificateAction Ignore PS C:\WINDOWS\system32> Connect-VIServer -Server servername Get-VM -name vignesh-VM-1 | Get-AdvancedSetting -Name ‘disk.EnableUUID’ If that command returns no result or the value is false, you won’t see the disk serial number inside your OS. To Enable to DISK UUID, Refer this blog disk-serial-number-is-not-set-for-windows-server-2016-on-vmware-vsphere/

December 25, 2018 Vignesh Sathiyanantham

Storage capacity consumed by multiple unnecessary data copies costs businesses as much as $44 billion annually, according to IDC. It estimates that redundant copies of the same data ( copy data) account for more than 60% of enterprise disk storage capacity. The redundant copies are compounded by rational practices intended to protect the business with multiple separate copies of production data like full backups, disaster recovery copy, test and dev, data analytics All the extra storage comes at a cost, data storage isn’t cheap, businesses have to waste more money on unnecessary storage expenses. There are many Copy Data management…

November 19, 2018 Vignesh Sathiyanantham

Backup applications for the Virtualized environment back up the Virtual Machine at the image level and are not aware of what is going on inside the installed guest operating system. So before you back up your Virtual Machines you should ensure they are quiesced so they are in a consistent state to be backed up. Quiesce is to pause or alter a device or application to achieve a consistent state, usually in preparation for a backup. The quiesce operation is handled inside the guest OS, and for Windows VMs, the Volume Shadow Copy Service (VSS) handles this. If you don’t…

November 16, 2018 Vignesh Sathiyanantham

VMware Virtual Machine snapshots should not be used as a primary backup, Virtual Machine snapshots are good for the shorter period. you can create VM snapshot before applying hotfix and delete after successful patching. When VM snapshots are created the state of the virtual disk at the time the snapshot is taken will be preserved and all writes to the VMDK are redirected to a new delta disk file (The delta disk represents the difference between the current state of the virtual disk and the state that existed at the time the previous snapshot was taken), and the original VMDK…

July 31, 2018 Vignesh Sathiyanantham

If you’re looking into data protection solutions you’re probably have heard the phrase “3-2-1 backup”. You’ll hear it from most IT consultants, professionals as well as many backup vendors and admins. Every admin should have backups. This 3-2-1 principle works for any virtual environment regardless of the hypervisors you are running (VMware, Hyper-V or whatever). and it can effectively address any failure scenario Keep at least 3 copies of your data That includes the original copy and at least two backups. Keep the backed-up data on 2 different storage types The chances of having two failures of the same storage type…

July 7, 2018 Vignesh Sathiyanantham

Cloud Server/network outages are wrecking balls, and it can happen with a dominant market player like the Amazon Web Services (AWS), The latest is an extensive outage brought on by a human error at an AWS data center in Virginia. Many consider it to be the worst hit in four years. And in June 2016: The storms that battered Sydney also shook AWS services. An extensive power outage led to the failure of a number of Elastic Compute Cloud (EC2) instances and Elastic Block Store (EBS) volumes, many of which hosted critical workloads for big brands. The result was that…

June 22, 2018 Vignesh Sathiyanantham

Data loss can be a common experience of computer users; a 2008 survey found that 66% of respondents had lost files on their home PC. A backup refers to the copying into an archive file of computer data so it may be used to restore the original after a data loss event. If a computer system is not having active IOs to the backup directory and we copy the data to archival location then we have a good copy of backup ( consistent backup ) . If a computer system is in use while it is being backed up, the…

January 22, 2018 Vignesh Sathiyanantham 1Comment

Recently, An Indiana hospital paid a ransom of $55,000 to get rid of ransomware that had infected its systems and was hindering operations. when attackers breached the network of Hancock Health, a regional hospital in the city of Greenfield, Indiana. Hancock Health CEO Steve Long said the hackers are believed to be in eastern Europe and may have used a type of ransomware called SamSam, SamSam encrypted files and renamed them with the phrase “I’m sorry”, according to a local newspaper who broke the news. The hospital said that despite having backups it opted to pay the ransom demand of…