Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 14, Using VERITAS Storage Expert
Identifying Configuration Problems Using Storage Expert
391
Checking the Number of Columns in RAID-5 Volumes (vxse_raid5)
To check whether RAID-5 volumes have too few or too many columns, run rule
vxse_raid5.
By default, this rule assumes that a RAID-5 plex should have more than 4 columns and
fewer than 8 columns.
See “Performing Online Relayout” on page 254 for information on changing the number
of columns.
Checking the Stripe Unit Size of Striped Volumes (vxse_stripes1)
By default, rule vxse_stripes1 reports a violation if a volume’s stripe unit size is not
set to an integer multiple of 8KB.
See “Performing Online Relayout” on page 254 for information on changing the stripe
unit size.
Checking the Number of Columns in Striped Volumes (vxse_stripes2)
The default values for the number of columns in a striped plex are 16 and 3. By default,
rule vxse_stripes2 reports a violation if a striped plex in your volume has fewer than 3
columns or more than 16 columns.
See “Performing Online Relayout” on page 254 for information on changing the number
of columns in a striped volume.
Disk Sparing and Relocation Management
The hot-relocation feature of VxVM uses spare disks in a disk group to recreate volume
redundancy after disk failure.
Checking the Number of Spare Disks in a Disk Group (vxse_spares)
This “best practice” rule assumes that between 10% and 20% of disks in a disk group
should be allocated as spare disks. By default, vxse_spares checks that a disk group
falls within these limits.
See “Administering Hot-Relocation” on page 327 for information on managing the pool of
spare disks.