It is possible to add more logs to a RAID-5 volume at a later time. Physical objects are direct mappings to physical disks 2. VxVM uses two types of objects to perform the storage management 1. The number of logs must equal the number of disks that is specified to logdisk. OctoBeginner’s Lesson VERITAS Volume Manager for Solaris Veritas Volume Manager is a storage management application by Symantec, which allows you to manage physical disks as logical devices called volumes. Ncol=3 nlog=2 logdisk=mydg07,mydg08 mydg04 mydg05 mydg06 ![]() # vxassist -b -g mydg -o ordered make volraid 10g layout=raid5 \ It also creates two RAID-5 logs on disks mydg07 and mydg08. logdisk= disk \įor example, the following command creates a 3-column RAID-5 volume with the default stripe unit size on disks mydg04, mydg05 and mydg06. Use the following form of the vxassist command to specify the disks from which space for the logs is to be allocated: # vxassist -o ordered make volume length \ If you use ordered allocation when creating a RAID-5 volume on specified storage, you must use the logdisk attribute to specify on which disks the RAID-5 log plexes should be created. Having two RAID-5 log plexes for each RAID-5 volume protects against the loss of logging information due to the failure of a single disk. These log plexes should be located on different disks. It is suggested that you configure a minimum of two RAID-5 log plexes for each RAID-5 volume. To support concurrent access to the RAID-5 array, the log should be several times the stripe size of the RAID-5 plex. RAID-5 logs can be concatenated or striped plexes, and each RAID-5 log associated with a RAID-5 volume has a complete copy of the logging information for the volume. If you require RAID-5 logs, you must use the logdisk attribute to specify the disks to be used for the log plexes. It also creates two RAID-5 logs rather than the default of one log. This creates a RAID-5 volume with the default stripe unit size on the default number of disks. Specify the -b option if you want to make the volume immediately available for use.įor example, to create the RAID-5 volume volraid together with 2 RAID-5 logs in the disk group, mydg, use the following command: # vxassist -b -g mydg make volraid 10g layout=raid5 nlog=2 To create a RAID-5 volume, use the following command: # vxassist make volume length layout=raid5 \ ![]() ![]() Do not create a RAID-5 volume with more than 8 columns because the volume will be unrecoverable in the event of the failure of more than one disk.
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