February 29, 2016 asvignesh
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,…
August 8, 2015 asvignesh
I’ve been developing an automation scripts to provision and expand VMFS Datastore. Expand not Extent… I increased the storage volume size and need to increase the size of VMFS datastore without affording the downtime Here is the VIjava / YAVI Java code for expanding the datastore https://gist.github.com/cd02090562b8cf2ee0e3   [[Amazon_Link_Text]]
January 6, 2015 asvignesh
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…
September 19, 2014 asvignesh
Setup iSCSI Initiator iSCSI Initiator is by default installed in Windows 7. You can access it  from Control Panel or Administrative Tools Click on iSCSI Initiator   If the service is not running it will prompt to start the service,Click Yes     Set the Ip of your iSCSI Target server, To create a iSCSI Target server in Ubuntu refer : http://blog.asvignesh.in/setup-iscsi-target-server-in-ubuntu/ Click Quick Connect Select the IP and click Connect Now the IP will show as connected in the Targets, Select Volumes and Devices tab Click Auto Configure Click Ok to close the iSCSI initiator properties Initialize and Format…
September 19, 2014 asvignesh
Setup Environment I have one Ubuntu server for iSCSI target and one Windows Machine for Initiator Target Server vignesh@vignesh-server:~$ sudo su root@vignesh-server:~$ apt-get update root@vignesh-server:~$ apt-get install iscsitarget Note : If you have changed the kernel version (Upgraded your Ubuntu ) you may hit FATAL: Module iscsi_trgt not found. if you hit this issue run apt-get install iscsitarget-dkms Creating Virtual Disk Create a new virtual disk of desired size,I am creating 5000M root@vignesh-server:~$ mkdir /mnt/iscsi root@vignesh-server:~$ dd if=/dev/zero of=/mnt/iscsi/scsivdisk.img bs=1M count=5000 Note dd is the Unix command , reads from STDIN and STDOUT but these can be change using if…