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Special Forums Hardware Filesystems, Disks and Memory Calculating Drive Space Increase Post 302192274 by mark54g on Tuesday 6th of May 2008 02:16:28 PM
Old 05-06-2008
Which RAID level are you using? Normally, RAID abstracts the disk space to the underlying OS and file system. If you are using 18GB drives, and using 3 drives, I assume RAID 5, then you will

A) have to see if your controller or driver will allow expansion to the RAID group.
B) Will always have N -1 capacity.

The requirements for RAID 5 are 3 drives minimum, with the capacity of a single drive being used across each of the drives for parity. This works out to N -1 all the time. If you had 9GB drives or 146GB drives it would not matter. You will always have N -1.

For example, 3 drives using 9GB drives will yield approximately 18GB of usable space. If you had 7 drives in a RAID 5 array, you will have (N -1, or 6 in that case * capacity) ~54GB of space.

The drive letters are being created based upon logical layout. That was chosen either by you or the program when it was created.

Basically, you as the user of a RAID should not care about individual drive usage. Part of the point of RAID is that it abstracts this. Your system should see 1 device. How you allocate it is up to you as the administrator. With that 1 large abstracted device, you could have carved the logical devices into 200MB chunks. That would have nothing to do with the array. That, I believe, is your problem.

Don't focus on usable space per drive, as you are confusing "per drive" with per logical device.
 

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lsimega(7D)															       lsimega(7D)

NAME
lsimega - SCSI HBA driver for LSI MegaRAID 320-2x SCSI RAID Controller The lsimega SCSI RAID host bus adapter driver is a SCSA-compliant nexus driver that supports LSI MegaRAID 320-2x SCSI RAID devices. The lsimega driver supports standard functions provided by the SCSA interface, including RAID disk I/O and passthrough I/O to support SCSI tape and CDROM. DRIVER CONFIGURATION
The lsimega.conf file contains no user configurable parameters. Please configure your hardware through BIOS. The LSI MegaRAID 320-2x device can support up to 40 logic drivers. Note that BIOS numbers the logic drives as 1 through 40, however in Solaris these drives are numbered from 0 to 39. See attributes(5) for a description of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability | | +-----------------------------+-----------------------------+ FILES
/kernel/drv/lsimega 32-bit ELF kernel module. /kernel/drv/amd64/lsimega 64-bit kernel module ( only). /kernel/drv/lsimega.conf Driver configuration file (contains no user-configurable options). prtconf(1M), attributes(5), amr(7D), scsi_hba_attach(9F), scsi_sync_pkt(9F), scsi_transport(9F), scsi_inquiry(9S), scsi_device(9S), scsi_pkt(9S) Small Computer System Interface-2 (SCSI-2) 20 April 2005 lsimega(7D)
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