Autoraid 12H

[#1]

What shall I change to get berst performance????

Overall State of Array = READY
Array configuration:
Active Hot Spare Desired = DISABLED
Auto Include = ENABLED
Auto Rebuild = ENABLED
Rebuild Priority = HIGH
Capacity Depletion Threshold = 0%
Write Working Set Interval = 8640 seconds
Language = ENGLISH
Log Full Warning = DISABLED
Volume Set Partitioning = DISABLED
Format Pattern Fill = DISABLED
Subsystem Type ID = 12
LUN Creation Limit = 8
Maximum LUN Creation Limit = 8
Array SCSI configuration:
Controller X SCSI Address = 0
Controller Y SCSI Address = 1
Write Cache = ENABLED
Read Cache = DISABLED
SCSI Parity Checking = ENABLED
SDTR = DISABLED
WDTR = DISABLED
Terminator Power = ENABLED
Unit Attention = ENABLED
Disable Remote Reset = DISABLED
Secondary Controller Offline = DISABLED
Very Early Busy = DISABLED
Queue Full Threshold = 1952
Maximum Queue Full Threshold = 1952
Simplified Resiliency Setting = Normal
Single Controller Warning = ENABLED
Lock Write Cache On = TRUE
Disable NVRAM on WCE False = FALSE
Disable NVRAM with One Ctrlr = TRUE
Disable NVRAM on UPS absent = FALSE
Force Unit Access Response = 0
Disable Read Hits = FALSE
Resiliency Threshold = 4

Tanks

[Bill McNAMARA_1]

Perf is gained from proper bus traffic distribution.

strings /etc/lvmtab
ioscan -fnkC disk

and

arraydsp

leaving 50% of capacity unused (unallocated to luns) so the array will leave most data in R1/0 and not R5.

but if you really want to change some management stuff and gain a tiny bit more:


Active Hot Spare Desired = ENABLED
HS is ACTIVE (used for R1/0 storage)

Auto Include = ENABLED
Auto Rebuild = ENABLED
Rebuild Priority = HIGH
(these options will hurt when a disk fails, redundancy is lost - not data, set this to low so that i/o has priority, not the rebuild.. but you are in N not N+1, so this is your call)


Capacity Depletion Threshold = 0%
Write Working Set Interval = 8640 seconds
This needs statistics turned on and analysis of results...


Controller X SCSI Address = 0
Controller Y SCSI Address = 1


Write Cache = ENABLED
Read Cache = DISABLED
makes no difference, but turn them on anyways.. (this is really for windows compatability)

SCSI Parity Checking = ENABLED
(mmm, leave..)

SDTR = DISABLED
WDTR = DISABLED
ENABLE, ENABLE


Queue Full Threshold = 1952
Maximum Queue Full Threshold = 1952
Simplified Resiliency Setting = Normal
(* ** * * * Careful setting this! see the man page arraymgr!!!!! you can get good perf here, once you shutdown you 12H correctly and have a UPS!!!!

[Eugeny Brychkov]

Fully agree with Bill. Very good is that FUA is 0. This means that you have good ARM software installed which turns off Forced Unit Access (12h uses its cache all the time), see http://www3.jpn.hp.com/cgi/service/itrcforum/msg_list_disp.cgi?open_flag=1&mode=0&category=8&msg_id=8953
Also agree that SDTR and WDTR should be enabled.
BTW, why are you asking? Do you have perfomance problems with 12h? Can you explain?
Eugeny