Configuration settings for RamSan systems

The RamSan^® GUI provides configuration settings and options that can be used with Lenovo Storage V series clustered systems.

LU options and settings

When you create a logical unit (LU), the options in Table 1 are available on RamSan^® systems.

Table 1. RamSan^® LU options
Option	Data type	Range	Default	Lenovo Storage V series setting	Comments
Name	String	1 character - 32 characters	Logical unit number	Any	This is only for management reference.
Number	Integer	0 - 1023	Next available LUN	0 - 254	Some hosts have known limitations of 254 as their highest LUN ability. One logical unit can appear at multiple LUNs. For example, the same data could appear at LUN 1, LUN 7, and LUN 124.
Size	Integer	1 MB - maximum capacity	Maximum available capacity	Any	MB and GB are BASE2 offerings.
Sector size	Option list	512 - 4096	512	512	Lenovo Storage V series does not support the new large-sector 4096-byte presentation.
Offset	Option list	0 - 32	0	0	Sector alignment offset
Backup mode	Option list	Writeback caching or writethrough caching	Writeback caching	Writeback caching	Use writeback caching in production. Use writethrough caching strictly for diagnostics.
Device ID	Integer	Blank, 0 - 32768	Blank	Blank	Specific only to OpenVMS.
Report corrected media errors	Checkbox	Checked or Unchecked	Checked	Checked	Notifies the host if Electronic Customer Care (ECC) was used to correct the requested data.
Report uncorrected media errors	Checkbox	Checked or Unchecked	Checked	Checked	Always report uncorrected media errors.

No host options are required to present the RamSan^® systems to Lenovo Storage V series systems.