Is Write back cache enabled on physical disks of Perc 6/i ?

Dushyanth dushyanth at
Wed Mar 25 11:40:23 CDT 2009

Hi guys,

I having a bunch of mail servers suffering ext3 FS corruption which might be due
to write back cache enabled on the physical disks. (Refer to for the
corruption details)

Iam not able to verify whether the physical disks on a perc 6/i has write back
cache enabled as OMSA physical disk properties does not show this property

Controller PERC 6/i Integrated (Embedded)
ID                        : 0:0:0
Status                    : Ok
Name                      : Physical Disk 0:0:0
State                     : Online
Failure Predicted         : No
Progress                  : Not Applicable
Type                      : SATA
Capacity                  : 465.25 GB (499558383616 bytes)
Used RAID Disk Space      : 465.25 GB (499558383616 bytes)
Available RAID Disk Space : 0.00 GB (0 bytes)
Hot Spare                 : No
Vendor ID                 : DELL
Product ID                : ST3500630AS
Revision                  : 3.AAK
Serial No.                : 6QG1B1T7    6QG1B1T7
Negotiated Speed          : Not Available
Capable Speed             : Not Available
Manufacture Day           : Not Available
Manufacture Week          : Not Available
Manufacture Year          : Not Available
SAS Address               : 1221000000000000

These servers are all Dell and have Battery backup.

# omreport chassis batteries

Health : Ok

Individual Battery Elements
Index      : 0
Status     : Ok
Probe Name : System Board CMOS Battery
Reading    : Good

Also, If a IPMI based power recycle is executed on a busy mail server and
assuming write back cache is enabled on the physical disks and also on the
virtual disk - would the controller ensure data is flushed by the physical disks
cache as well ? Cos if the controller doesn't ensure that physical disks flush
their cache it might lead to FS corruption.

Any pointers/suggestions would be of great help.


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