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General Operating Guidelines and Limitations
StorNext User’s Guide 346
All The Move Stripe Group Data feature (part of Dynamic Resource Allocation)
does not support moving sparse files. Sparse files are files that lack on-disk
allocations for some of the data within the data range indicated by the size of
the file.
A stripe group is defragmented as part of the data moving process. Because
defragmenting a sparse file would make it unsparce (and increase disk
usage),
snfsdefrag skips sparse files when defragmenting. Therefore, all
existing sparse files remain on the original stripe group after moving of other
files is complete.
As an example, the gnu “cp” command uses a heuristic to attempt
maintaining the “sparseness” of a file.
Because the file system in question has already had the source stripe group
marked read-only, the “cp” command has no choice but to move the file off
of the original stripe group.
Clients outside a NAT firewall can no longer access a metadata controller
inside the firewall.
Support for client access through non-NAT firewalls continues to be
supported via the fsports configuration file.
If you have configured custom mount options in the /etc/fstab file other than
rw and diskproxy, if you subsequently add or remove the disk proxy settings
using the StorNext GUI, any custom mount options will be lost. (Settings are
added or removed in the StorNext GUI by navigating to the SNFS home page
and then choosing Filesystems > Modify from the Config menu.)
In StorNext 3.0, the
buffercachemin and buffercachemax parameters are
deprecated and are replaced by
buffercachecap.
Also, in the Client Configuration Windows utility, the Buffer Cache Min and
Buffer Cache Max settings are replaced by Buffer Cache Cap. The Non-Paged
Pool Percentage setting has been removed.
If you use an SDisk or DDisk, you should save at least one other copy of the
data to tape or to another SDisk or Ddisk. Without the second copy, your
stored data will be vulnerable to data loss if you ever have hardware failure.
Operating System /
Affected Component Description