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A database administrator wants to change the default block size to 32 KB. How can you achieve this on a ZFS Storage Appliance?
Block size is included Share properties.
Volume Block Size is the native block size for LUNs. This can be any power of 2 from 512 bytes to 1M, and the default is 8K.
References:
Oracle ZFS Storage Appliance Administration Guide (June 2014), page 281
When an operation lacks sufficient disk space, which three configurations can make available on a ZFS Storage Appliance?
Thin Provisioned
Controls whether space is reserved for the volume. This property is only valid for LUNs. By default, a LUN reserves exactly enough space to completely fill the volume. This ensures that clients will not get out-of-space errors at inopportune times. This property allows the volume size to exceed the amount of available space. When set, the LUN will consume only the space that has been written to the LUN.
Hybrid Columnar Compression is an Oracle Database compression technology which enables the highest levels of data compression and provides enterprises with cost savings and performance improvements due to reduced I/O. Hybrid Columnar Compression can be enabled on Oracle Databases residing on dNFS shares without ASM on an Oracle ZFS Storage Appliance beginning with Oracle Database Enterprise Edition 11.2.0.3.
If your data does contain duplicates, enabling Data Deduplication will both save space by storing only one copy of a given block regardless of how many times it occurs.
A storage system has plenty of storage space available. Which storage profile should a storage administrator use when both high performance and high reliability are required?
RAID in which each stripe contains two parity disks. As with triple mirroring, this yields high availability, as data remains available with the failure of any two disks. Double parity RAID is a higher capacity option than the mirroring options and is intended either for high-throughput sequential-access workloads (such as backup) or for storing large amounts of data with low random-read component.
Note: Triple mirrored
Data is triply mirrored, yielding a very highly reliable and high-performing system (for example, storage for a critical database). This configuration is intended for situations in which maximum performance and availability are required. Compared with a two-way mirror, a three-way mirror adds additional IOPS per stored block and higher level protection against failures.
Which configuration should improve ZFS throughput and response time for stable write processing (for example, O_SYMC)?
Each pool can contain multiple ZFS virtual devices (vdevs).
