How to expand existing volume size of Dell Compellent

 We have a old Dell Compellent Series 40. I never worked on it before.

Is there any way to increase the existing volume size without going off line of the volume, please ?

We created a 500GB volume and mounted it to a server, Several Replays are taken as policy applied. The volume usage is around 30% when we see it in server end, but in the storage end it looks almost full, so remaing space is very low!!

As there are having Replays policy, I am in confusion to understand the space usage of the volume with the indications through "Configured Space". "Free Space", "Total Disk Space", "Actual Space". "Replay Space" ???

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If you have available disk space in the SAN then you can just expand the volume on the SAN then within the OS/hypervisor do a rescan of the disks and extend the volume. This can be done online.

Configured Space = what the OS sees as the volume size

Free Space = free space within the OS

Total Disk Space = combination of used space plus any spaced used by snapshots including the RAID overhead (for example: if it's 5 GB configured and no snapshots for a R10 volume then you are using 10 GB (because the data is written 2 times)).  

Actual Space = Active + Replay Space

Replay Space = Space consumed by Replay/Snapshot data

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