A few chapters of the upcoming OpenSolaris Bible have been released. Specifically, looking through chapter 8 on ZFS, I came across this handy list of properties and their descriptions.
***File System Properties***
aclinherit-- Inheritance of ACL entries
aclmode-- Modification of ACLs in a chmod(2) operation
atime-- Whether access times of files are updated when read
available-- Space available to the file system
canmount-- Whether the file system is mountable
casesensitivity-- Case sensitivity of filename matching
checksum-- Checksum algorithm for data integrity
compression-- Compression algorithm
compressratio-- Compression ratio achieved
copies-- Number of data copies stored
creation-- Time the file system was created
devices-- Whether device nodes can be opened
exec-- Whether processes can be executed
mounted-- Whether the file system is mounted
mountpoint-- Mount point for the file system
nbmand-- Use of nonblocking mandatory locks with CIFS
normalization-- Use Unicode-normalized filenames in name comparisons
origin-- Snapshot on which a clone is based
primarycache-- Controls whether ZFS data and metadata are cached in the
primary cache
quota-- Limit on space that the file system can consume
readonly-- Whether the file system can be modified
recordsize-- Suggested block size for files
referenced-- Amount of data accessible within the file system
refquota-- Space limit for this file system
refreservation-- Minimum space guaranteed to the file system
reservation-- Minimum space guaranteed to the file system and
descendants
secondarycache-- Controls whether ZFS data and metadata are cached in
the secondary cache
setuid-- Allow setuid file execution
shareiscsi-- Export volumes within the file system as iSCSI targets
sharenfs-- Share the file system via NFS
sharesmb-- Share the file system via CIFS
snapdir-- Whether the .zfs directory is visible
type-- Type of dataset
used-- Space consumed by the file system and descendants
usedbychildren-- Space freed if children of the file system were
destroyed
usedbydataset-- Space freed if snapshots and refreservation were
destroyed, and contents of the file system were deleted
usedbyrefreservation-- Space freed if the refreservation was removed
usedbysnapshots-- Space freed if all snapshots of the file system were
destroyed
utf8only-- Use only UTF-8 character set for filenames
version-- On-disk version of the file system
vscan-- Whether to scan regular files for viruses
xattr-- Whether extended attributes are enabled
zoned-- Whether the file system is managed from a nonglobal zone
***Volume Properties***
available-- Space available to the volume
checksum-- Checksum algorithm for data integrity
compression-- Compression algorithm
compressratio-- Compression ratio achieved
copies-- Number of data copies stored
creation-- Time the volume was created
origin-- Snapshot on which the clone is based
primarycache-- Controls whether ZFS data and metadata are cached in the
primary cache
readonly-- Whether the volume can be modified
referenced-- Amount of data accessible within the volume
refreservation-- Minimum space guaranteed to the volume
reservation-- Minimum space guaranteed to the volume and descendants
secondarycache-- Controls whether ZFS data and metadata are cached in
the secondary cache
shareiscsi-- Export the volume as an iSCSI target
type-- Type of dataset
used-- Space consumed by the volume and descendants
usedbychildren-- Space freed if children of the volume were destroyed
usedbydataset-- Space freed if snapshots and refreservation were
destroyed, and contents of the volume were deleted
usedbyrefreservation-- Space freed if the refreservation was removed
usedbysnapshots-- Space freed if all snapshots of the volume were
destroyed
volblocksize-- Block size of the volume
volsize-- Logical size of the volume
Some of these properties were new to me, as they probably only exist in later versions of ZFS in OpenSolaris. Specifically, vscan, to scan files for viruses is interesting. I’m wondering where virus definations are stored and updated. This is actually a pretty nifty feature if you plan on using Solaris’ new in-kernel SMB server to share data with Microsoft Windows based clients.
UPDATE: Richard provided via a commentan awesome link that shows how to administrate the new CIFS server within OpenSolaris, as well as how to execute the virus scan using the vscanadm utility. Take a look at the slides on that link for an in-depth administrative tour of these features.
I’d like to learn more about the primarycache and secondarycache settings – exactly what gets tuned when fiddling around with these.
Also, a property called “copies” which allows you to specifiy how many copies of the data should be kept on disk. I’m not sure exactly why you would want to increase the number of copies of data instead of using raidz, raidz2, mirroring, hot spares, etc. but its neat that the option is there.