August 21, 2019 Vignesh Sathiyanantham

Who uses MongoDB? Based on the online resource* there are 37,658 Companies using MongoDB, MongoDB is most often used by companies with 10-50 employees and 1M-10M dollars in revenue, and the market share is about 5.0% and also many financial services using the MongoDB Data is always critical whether its RDBMS or NoSQL or Flat files AWS EBS Volume Snapshot is block-level incremental snapshots, which is one of the best and efficient way to protect the Data in the EC2 environment, you might have read lots of posts, whitepapers about advantages of using the snapshot technology. But the Snapshots of…

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…

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…

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…

February 29, 2016 Vignesh Sathiyanantham

Shadow Copies  are possible for almost all volumes and not “all volumes”. There are few cases which the shadow copy may not work Enough Space The shadow storage volume must contain enough free space. At the very minimum you need at least 300 MB or so, for a single shadow copy, for multiple shadow copies, the space can increase more depending on the I/O usage. You can always run the command VSSADMIN LIST SHADOWSTORAGE to see how much space is used for the existing shadow copies. Only Fixed Drives Only fixed drives are supported. You cannot enable Shadow Copy on removable,…

January 6, 2015 Vignesh Sathiyanantham

Inconsistent Backup The oldest type of backup probably not consistent. The process of taking the backup was so simple, backup application starts at the beginning of a file structure and copies all of the data until it reaches the end, resulting in a backup (Inconsistent). The reason which can make this backup inconsistent is that if any user added/modified after a backup but before it completed that would result in an inconsistent backup; the files in the backup are not consistent. Mainly the volumes which have Random read and random writes application like databases these types of backups do not…