Xen hypervisor: Assign Virtual Disk to a Virtual Machine

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Dealing with  our daily admin tasks we face lot of requests where we need to assign virtual disks or additional disks to Virtual Machines running on Xen hypervisor . Xen hypervisor have lot of “xm” commands that can be used to manage the functionality  of Xen VM’s . As we know that we can use […]

Space utilization by .nfs entries under NFS

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On linux/unix systems if you delete a file that a currently running process still has open, the file isn’t really deleted or removed . Once the process closes the file, the OS then removes the file handle and free up the disk blocks. This process works slightly other way when the file that is open […]

LVM : A good way to utilize disks space

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  Scenario :   Let say , You have 5 disks each with 20 GB , now you have requirements to create FS of size 25 GB and 35GB and let rest of the  space  unassigned for any future needs .    Technically , this is  not possible to allocate space as each disk is […]

Fixing LVM I/O Errors

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Situation : Most of us faced errors mentioned below during our system admin activities   , this is mainly related to the removable storage media that we use on unix servers’ Reason of this could be because removing the disk/LUN’s without clean shutdown/unmount or deattaching disks from LV’s  . /dev/sdf: read failed after 0 of 4096 at 0: […]