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FW: DL380/G5 CISS driver and write caching



I have a DL380/G5:

                2 x Quad Core

                16GB RAM

                P400 RAID Controller (Battery backed write cache (BBWC)) - Battery is installed and the BIOS is not reporting any problems with it on boot-up.

 

We are running:

                NetBSD/amd64 5.1 kernel from the install CD

 

Subset of the dmsg for related devices:

 

ciss0 at pci7 dev 0 function 0: HP Smart Array 3

ciss0: interrupting at ioapic0 pin 18

ciss0: 2 LDs, HW rev 3, FW 7.22/7.22

 

scsibus0 at ciss0: 2 targets, 1 lun per target

 

sd0 at scsibus0 target 0 lun 0: <HP, LOGICAL VOLUME, 7.22> disk fixed

sd0: 69363 MB, 17409 cyl, 255 head, 32 sec, 512 bytes/sect x 142057440 sectors

 

sd1 at scsibus0 target 1 lun 0: <HP, LOGICAL VOLUME, 7.22> disk fixed

sd1: 838 GB, 65535 cyl, 255 head, 105 sec, 512 bytes/sect x 1757614684 sectors

 

When using “scsictl” or “dkctl” we observe the following:

 

# /sbin/dkctl sd0 getcache

/dev/rsd0d: read cache enabled

/dev/rsd0d: read cache enable is not changeable

/dev/rsd0d: write cache enable is not changeable

/dev/rsd0d: cache parameters are not savable

 

# /sbin/scsictl sd0 getcache

/dev/rsd0d: read cache enabled

/dev/rsd0d: write-back cache not enabled

/dev/rsd0d: caching parameters are not savable

 

My question are:

1)      Does the CISS driver take advantage of the write cache?

2)      Is ths BBWC a HW level thing that the CISS driver is not even aware of

 

Thank you

Scott…

 

 

 

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