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тАО07-18-2005 08:46 AM
тАО07-18-2005 08:46 AM
Solved! Go to Solution.
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тАО07-19-2005 01:25 AM
тАО07-19-2005 01:25 AM
Re: Balancing on 12H
The balancing usualy after replacing a failed disk or if the array is new. Frequent balancing? How often it balances?
Check th disk statusus.. arraydsp -d
You can also check the event logs using arraylog for suspecious failures. see man page of arraylog.
"Unable to access" what about ioscan? Is all the LUNs are claimed?
Regds
TT
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тАО07-19-2005 01:55 AM
тАО07-19-2005 01:55 AM
Re: Balancing on 12H
We ran arraylog -d command for all A1 - B6 disks and saw that under "Read Error Counter Page" -> "Corrected read errors without delay = 9540055" and "Total Corrected read errors = 9540055" and "Total times read ECC used = 9540055". I see similar error meesages across all A1 - B6 disks.
When I checked onthe configuration, I see the below listing where "Read Cache" is disabled. Are these read error related to the disabling of Read cache which is inturn causing the Array to balance?
Array SCSI configuration:
Controller X SCSI Address = 5
Controller Y SCSI Address = 5
Write Cache = ENABLED
Read Cache = DISABLED
SCSI Parity Checking = ENABLED
SDTR = ENABLED
WDTR = ENABLED
Terminator Power = ENABLED
Unit Attention = ENABLED
Disable Remote Reset = ENABLED
Secondary Controller Offline = DISABLED
Very Early Busy = DISABLED
Queue Full Threshold = 1952
Maximum Queue Full Threshold = 1952
Simplified Resiliency Setting = Unknown
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 = 2
Disable Read Hits = FALSE
Resiliency Threshold = 4
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тАО07-19-2005 02:11 AM
тАО07-19-2005 02:11 AM
Re: Balancing on 12H
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тАО07-19-2005 03:31 AM
тАО07-19-2005 03:31 AM
Re: Balancing on 12H
according to the manual, "balancing" state means the array is re-ditributing data among disk modules for better performance -
A failed disk would "rebuild" not balance. However, you are obviously seeing worse performance during balancing.
How full is this array, and how much available space is there? Not disk space that was used and files deleted, but space never allocated before to any luns?
The 12H likes lots of unused free space.
It will move Raid 1/0 data to Raid 5 space when it runs out. We had very very bad performance when our 12H's were near capacity.
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тАО07-19-2005 04:17 AM
тАО07-19-2005 04:17 AM
Re: Balancing on 12H
I got this output from "armdsp -a" command -
--- Disk space usage --------------------
Total physical = 207415 MB *
Allocated to LUNs = 129024 MB *
Used as Active Hot spare = 17366 MB *
Used by non-included disks = 0 MB *
Used for Redundancy = 32237 MB *
Unallocated (avail for LUNs) = 28788 MB *
-----------------------------------------
If I remember right, shouldn't firmware operations like Balancing, Optimizing .. be run as background operations without affecting the IO or accessibility to LUNS? There was no mechanism available to stop all these activities in a VA .. can we stop them manually in 12H?
We are currently using Firmware revision HP56. Is there any other later release that corrects this issue?
Thank you so much for analysing our problem.
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тАО07-19-2005 04:36 AM
тАО07-19-2005 04:36 AM
Re: Balancing on 12H
All it ever told me was to add more disks.
Also, what is your scsi cable config - we went from two to four cables at one point, then to 8 for failover. Wondering if a scsi connection is dead. Do you see anything is /var/adm/syslog about scsi lbolt or scsi errors during these times.
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тАО07-19-2005 04:48 AM
тАО07-19-2005 04:48 AM
Solution12H's like 40-50% unallocated disk space for best performance. See this link too:
http://forums2.itrc.hp.com/service/forums/questionanswer.do?threadId=63401&admit=-1335382922+1121798533499+28353475
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тАО07-19-2005 04:59 AM
тАО07-19-2005 04:59 AM
Re: Balancing on 12H
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тАО07-19-2005 07:19 AM
тАО07-19-2005 07:19 AM