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тАО07-19-2009 09:37 PM
тАО07-19-2009 09:37 PM
How to enable Drive Write Cache on E200?
hpacucli ctrl all show config detail
Smart Array E200 in Slot 3
Bus Interface: PCI
Slot: 3
Serial Number: PA6C90L9SV912J
Cache Serial Number: P9A3A0B9SV92RZ
RAID 6 (ADG) Status: Disabled
Controller Status: OK
Chassis Slot:
Hardware Revision: Rev A
Firmware Version: 1.82
Rebuild Priority: Medium
Expand Priority: Medium
Surface Scan Delay: 15 sec
Cache Board Present: True
Cache Status: OK
Accelerator Ratio: 50% Read / 50% Write
Drive Write Cache: Disabled
Total Cache Size: 128 MB
Battery Pack Count: 1
Battery Status: OK
SATA NCQ Supported: False
Array: A
Interface Type: SAS
Unused Space: 0 MB
Status: OK
Logical Drive: 1
Size: 136.7 GB
Fault Tolerance: RAID 5
Heads: 255
Sectors Per Track: 32
Cylinders: 35124
Stripe Size: 64 KB
Status: OK
Array Accelerator: Enabled
Parity Initialization Status: Initialization Completed
Unique Identifier: 600508B100104C3953563931324A0002
Disk Name: /dev/cciss/c0d0
Mount Points: / 63.5 GB, /weather 58.4 GB, /var 9.8 GB, /tmp 1000 MB
Logical Drive Label: A038EA87PA6C90L9SV912J5D96
physicaldrive 1I:1:1
Port: 1I
Box: 1
Bay: 1
Status: OK
Drive Type: Data Drive
Interface Type: SAS
Size: 72 GB
Rotational Speed: 10000
Firmware Revision: HPDC
Serial Number: 3NP28YN500009819BHZZ
Model: HP DG072ABAB3
PHY Count: 1
PHY Transfer Rate: 3.0GBPS
physicaldrive 1I:1:2
Port: 1I
Box: 1
Bay: 2
Status: OK
Drive Type: Data Drive
Interface Type: SAS
Size: 72 GB
Rotational Speed: 10000
Firmware Revision: HPDC
Serial Number: 3NP27F8700009818L36S
Model: HP DG072ABAB3
PHY Count: 1
PHY Transfer Rate: 3.0GBPS
physicaldrive 1I:1:3
Port: 1I
Box: 1
Bay: 3
Status: OK
Drive Type: Data Drive
Interface Type: SAS
Size: 72 GB
Rotational Speed: 10000
Firmware Revision: HPDC
Serial Number: 3NP28ZKS00009819VEGP
Model: HP DG072ABAB3
PHY Count: 1
PHY Transfer Rate: 3.0GBPS
Array: B
Interface Type: SAS
Unused Space: 0 MB
Status: OK
Logical Drive: 2
Size: 136.7 GB
Fault Tolerance: RAID 0
Heads: 255
Sectors Per Track: 32
Cylinders: 35132
Stripe Size: 128 KB
Status: OK
Array Accelerator: Enabled
Unique Identifier: 600508B100104C3953563931324A0003
Disk Name: /dev/cciss/c0d1
Mount Points: None
Logical Drive Label: A0269805PA6C90L9SV912JE5B6
physicaldrive 1I:1:4
Port: 1I
Box: 1
Bay: 4
Status: OK
Drive Type: Data Drive
Interface Type: SAS
Size: 146 GB
Rotational Speed: 10000
Firmware Revision: 0002
Serial Number: 3NM4GNXW00009829JEAG
Model: SEAGATE ST9146802SS
PHY Count: 2
PHY Transfer Rate: 3.0GBPS, Unknown
[root@lightning ~]#
~]# hpacucli ctrl all modify dwc=enable
Warning: Without the proper safety precautions, use of write cache on physical
drives could cause data loss in the event of power failure. To ensure
data is properly protected, use redundant power supplies and
Uninterruptible Power Supplies. Also, if you have multiple storage
enclosures, all data should be mirrored across them. Use of this
feature is not recommended unless these precautions are followed.
Continue? (y/n) y
Error: This operation is not supported with the current configuration. Use the
"show" command on devices to show additional details about the
configuration.
[root@lightning ~]#
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тАО07-19-2009 11:09 PM
тАО07-19-2009 11:09 PM
Re: How to enable Drive Write Cache on E200?
Warning: Without the proper safety precautions, use of write cache on physical
drives could cause data loss in the event of power failure.
Accelerator Ratio: 50% Read / 50% Write
You have cache on the RAM on the controller, which has a battery, why do you want another write cache on the disks? It's unsafe, as they do not have a battery to keep the data if a power failure happens.
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тАО07-19-2009 11:16 PM
тАО07-19-2009 11:16 PM
Re: How to enable Drive Write Cache on E200?
Drive cache speeds up the hard drive access by cache stored sector maps.
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тАО07-19-2009 11:29 PM
тАО07-19-2009 11:29 PM
Re: How to enable Drive Write Cache on E200?
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01149818
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тАО07-19-2009 11:42 PM
тАО07-19-2009 11:42 PM
Re: How to enable Drive Write Cache on E200?
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тАО07-22-2009 08:21 AM
тАО07-22-2009 08:21 AM
Re: How to enable Drive Write Cache on E200?
How to assign points on this new forum? Click the Kudos Star!
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тАО12-28-2009 10:23 AM
тАО12-28-2009 10:23 AM
Re: How to enable Drive Write Cache on E200?
ctrl all modify dwc=enable
to:
ctrl slot=0 modify dwc=enable (or maybe slot=3 for your particular case)