Give at least one reason why McKusick et al used a rotational delay in their original design of the HFS filesystem. Why is the rotational delay set to 0ms?
2:
None of the named files in this question exist at the beginning of the command sequence. Given an HFS or VxFS filesystem, is the following command sequence valid?
# ln s /data2/fileB /data1/fileA # ln s /data3/fileC /data2/fileB # ln s /data4/fileD /data3/fileC # ln s /data5/fileE /data4/fileD # ln s /data1/fileA /data5/fileE
What would be the outcome of this command?
# cat /data1/fileA
3:
As part of an overall backup strategy, you decide to use VxFS snapshots. You inform the user community that they can continue to use and access their application because the backup utility now backs up the data via the snapshot filesystem. The users are extremely pleased with this because they can now offer a continuous service of taking customer queries and placing new customer orders.
The volume used for the snapshot filesystem is housed on high-speed RAID disks that are connected to separate interface cards (to avoid any contention with IO from the online application). You have also added more memory to the system to accommodate the additional requirements of having the application and the backup running concurrently. What aspect of VxFS snapshot filesystems would cause the backup to take up to twice as long as before, even though you are backing up approximately the same amount of data?
4:
You decide that you are going to tune a VxFS filesystem using the vxtunefs command. You have a basic understanding of the IO characteristics of the application using the filesystem. The volume on which the filesystem resides is a RAID 5 volume housed on a disk array managed by another IT department (the Storage Management Department). You are not involved in building or managing the underlying volumes ; you simply request a volume size /resize, and it is supplied by the Storage Management Department. What parameters to vxtunefs should you consider tuning first?
5:
You have a VxFS filesystem that houses very sensitive and operationally critical company data. The application using the filesystem utilizes a large shared memory segment to manage the application- related IO to and from the database; one aspect of this is that the application will post writes to the on-disk database when it deems it necessary.
What mount options would you consider using to implement the security and integrity requirements of your company as well as any mount options that take into account the operational characteristics of your application?
