Comstar; Comstar Deferred Update; Triple Parity Raid; Triple-Parity Raid Deferred Update - Oracle Sun ZFS Service Manual

COMSTAR

upgrade all shares in the system to support this feature. Applying this deferred update also
allows the current usage (user or group) to be queried on a per-filesystem or per-project basis.
To quote the product documentation:
Quotas can be set on a user or group at the filesystem level. These enforce physical data usage
based on the POSIX or Windows identity of the owner or group of the file or directory. There are
some significant differences between user and group quotas and filesystem and project data
quotas.
Be sure to read the complete documentation under Space Management before attempting to
use user or group quotas.
This update is applied in the background, and takes time proportional to the number of shares
and amount of data on the system. Until this deferred update is finished, attempt to apply user
quotas will produce an error indicating that the update is still in progress.
COMSTAR

COMSTAR Deferred Update

The COMSTAR framework relies on a ZFS pool upgrade for complete support of persistent
group reservations (PGRs). Before this upgrade has been applied, the number of reservations
stored with each LUN is severely limited, and may even be zero.
Applying this update is equivalent to upgrading the on-disk ZFS pool to version 16.

Triple Parity RAID

Triple-Parity RAID Deferred Update

This update provides the ability to use the triple-parity RAID storage profile, RAID-Z with
three parity sectors per stripe. Triple-parity offers increased protection against drive failures
and additional overall availability.
In order to use this new mode, the storage pool must be upgraded. If you choose not to upgrade
the pool and attempt to use this new property, you will get an error indicating that the storage
pool needs to be upgraded first. There is no other implication of applying this update, and it can
be ignored if there is no need to use this new setting. Applying this update is equivalent to
upgrading the on-disk ZFS pool to version 17.
126 Sun ZFS Storage 7x20 Appliance Customer Service Manual • December 2011 E26399–02