4TB limitation on volume replication

[vkeven]

Just to check if people are aware that there is a limitation of 4TB with replication function on Open-E because they used DRBD( replication software for linux) free version , Open-E tell me that if enough people need more than a 4TB volume they will look to get the paid version of DRBD( DRBD+) so we will have a 16TB capacity for replicated volume on 32bit system. Some people need it?

[hologic]

I would also be interested in such a feature. We are using a Open-E with 20Tb of space.
Approx. 10Tb will have to be replicated.

[Joey]

If you read there help info in the volume manager it clearly states "The Maximal NAS (NAS), iSCSI (I) and Fibre Channel (FC) volume size (with replication) is limited to 4193120MB (megabytes).

If your volume (including volume replication) fails to be created, increase the Vmalloc size. This can be done via the Hardware Console Tools (ALT+CTRL+W) -> Tuning options -> Vmalloc size."

Just RTFM.....

Sorry but dont know why people do not read it.... it was created for a reason....

[To-M]

This is good to know that others need it as well the more we know that need this will help all. But just to let you know we never stated that we would not do this it is in our plans just not a confirmed date. Keven has the right idea to find out if there are others needing volumes replicating over 4TB. The more we know the better it helps us push the development date.

[vkeven]

How much memory Open-e has setup on vmalloc in the kernel? I read on the DRBD mailing list that alot of people have hard time to get volume over 2TB working with default 128M or 192M of vmalloc. Someone have try a full synchro of 4TB?

[vkeven]

Linbit ( DRBD programmer ) say that you need 32MB of vmalloc memory for 1TB of storage so the minimum is 128MB , how much open-e kernel is using?