ZVOL and snapshots length problem

[Ivailo A. Tanusheff]

Dear all,

I have some trouble creating and manipulating ZVOL on my server. I am using FreeBSD 10 and I am creating a little bit sophisticated structure, where I create several file systems and volumes inside them for easy manipulation and snapshot management.
An example structure is:
<POOL> / <General type of system> / <Application System name, if any> / <Server name> / <Volume name>

Whenever my ZVOL path exceeds 63 characters, both when creating volume or snapshot,  I receive this error in my messages log:
Feb 20 13:05:04 FreeBSD kernel: g_dev_taste: make_dev_p() failed (gp->name=zvol/TANK/Bank system/Core/DB at Daily_operations_2015-02-20-13:05, error=22)
Feb 20 13:05:04 FreeBSD kernel: g_dev_taste: make_dev_p() failed (gp->name=zvol/TANK/Bank system/Core/FS at Daily_operations_2015-02-20-13:05, error=22)
Feb 20 13:05:05 FreeBSD kernel: g_dev_taste: make_dev_p() failed (gp->name=zvol/TANK/Bank system/Core/Report at Daily_operations_2015-02-20-13:05, error=63)

Feb 20 13:10:05 FreeBSD kernel: g_dev_taste: make_dev_p() failed (gp->name=zvol/TANK/Bank system/Core/DB at Daily_operations_2015-02-20-13:10, error=22)
Feb 20 13:10:05 FreeBSD kernel: g_dev_taste: make_dev_p() failed (gp->name=zvol/TANK/Bank system/Core/FS at Daily_operations_2015-02-20-13:10, error=22)
Feb 20 13:10:05 FreeBSD kernel: g_dev_taste: make_dev_p() failed (gp->name=zvol/TANK/Bank system/Core/Report at Daily_operations_2015-02-20-13:10, error=63)

As far as I digged into it this is due to impossibility of creation  of /dev/zvol/... pointing to that volume or snapshot, while the volume/snapshot is still visible in the zfs list tree, although I am not quite sure I can use it.

Is there any way to fix this behavior or this is an implementation bug, not described in the manual?
If I create shorter names the problem disappears, but this is contra version of what I needed, so it is a not acceptable solution.

Regards,

Ivailo Tanusheff
Head of Demand and Project management department
Information Technologies Division


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