* [Bug 13499] New: Write cache: disabled, read cache: enabled, supports DPO and FUA? it's bug???
@ 2009-06-10 13:59 bugzilla-daemon
2009-06-10 14:00 ` [Bug 13499] " bugzilla-daemon
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: bugzilla-daemon @ 2009-06-10 13:59 UTC (permalink / raw)
To: linux-scsi
http://bugzilla.kernel.org/show_bug.cgi?id=13499
Summary: Write cache: disabled, read cache: enabled, supports
DPO and FUA? it's bug???
Product: SCSI Drivers
Version: 2.5
Kernel Version: 2.6.22 - 2.6.30
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
ReportedBy: lxy9805287@163.com
Regression: No
scsi0 : LSI Logic SAS based MegaRAID driver
scsi 0:0:0:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
done.
Begin: Running /scripts/init-premount ... scsi 0:0:1:0: Direct-Access
SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:2:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:3:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:4:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:5:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:6:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:7:0: Direct-Access SEAGATE ST9146852SS HT03 PQ: 0 ANSI: 5
scsi 0:0:32:0: Enclosure DP BACKPLANE 1.07 PQ: 0 ANSI: 5
scsi 0:2:0:0: Direct-Access DELL PERC 6/i 1.21 PQ: 0 ANSI: 5
scsi 0:0:32:0: Attached scsi generic sg0 type 13
sd 0:2:0:0: [sda] 1998323712 512-byte hardware sectors (1023142 MB)
sd 0:2:0:0: [sda] Write Protect is off
sd 0:2:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO and
FUA
sd 0:2:0:0: [sda] 1998323712 512-byte hardware sectors (1023142 MB)
sd 0:2:0:0: [sda] Write Protect is off
sd 0:2:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO and
FUA
sda: sda1 sda4 < sda5 sda6 sda7 sda8 sda9 >
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^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug 13499] Write cache: disabled, read cache: enabled, supports DPO and FUA? it's bug???
2009-06-10 13:59 [Bug 13499] New: " bugzilla-daemon
@ 2009-06-10 14:00 ` bugzilla-daemon
2009-06-10 14:14 ` James Bottomley
2009-06-10 14:14 ` bugzilla-daemon
2009-06-10 17:04 ` bugzilla-daemon
2 siblings, 1 reply; 6+ messages in thread
From: bugzilla-daemon @ 2009-06-10 14:00 UTC (permalink / raw)
To: linux-scsi
http://bugzilla.kernel.org/show_bug.cgi?id=13499
--- Comment #1 from ping.li <lxy9805287@163.com> 2009-06-10 14:00:53 ---
Write cache: disabled, read cache: enabled,
why Write cache: disabled??
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* Re: [Bug 13499] Write cache: disabled, read cache: enabled, supports DPO and FUA? it's bug???
2009-06-10 14:00 ` [Bug 13499] " bugzilla-daemon
@ 2009-06-10 14:14 ` James Bottomley
0 siblings, 0 replies; 6+ messages in thread
From: James Bottomley @ 2009-06-10 14:14 UTC (permalink / raw)
To: bugzilla-daemon; +Cc: linux-scsi
On Wed, 2009-06-10 at 14:00 +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> why Write cache: disabled??
The SCSI mid layer is merely reporting what your array is telling it.
For arrays without a battery backed cache, write through configuration
(i.e. read cache enabled, write cache disabled) is the usual safe
default.
You can alter your write cache settings using Doug Gilbert's
sg3-utils ... but be warned, enabling the write cache without battery
backing in an array is a dangerous thing to do since most arrays have
huge caches, they either ignore SYNCHRONIZE CACHE (which would leave you
vulnerable to data loss on power failure) or take such a long time, it
would kill performance.
James
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug 13499] Write cache: disabled, read cache: enabled, supports DPO and FUA? it's bug???
2009-06-10 13:59 [Bug 13499] New: " bugzilla-daemon
2009-06-10 14:00 ` [Bug 13499] " bugzilla-daemon
@ 2009-06-10 14:14 ` bugzilla-daemon
2009-06-10 17:04 ` bugzilla-daemon
2 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2009-06-10 14:14 UTC (permalink / raw)
To: linux-scsi
http://bugzilla.kernel.org/show_bug.cgi?id=13499
--- Comment #2 from Anonymous Emailer <anonymous@kernel-bugs.osdl.org> 2009-06-10 14:14:13 ---
Reply-To: James.Bottomley@HansenPartnership.com
On Wed, 2009-06-10 at 14:00 +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> why Write cache: disabled??
The SCSI mid layer is merely reporting what your array is telling it.
For arrays without a battery backed cache, write through configuration
(i.e. read cache enabled, write cache disabled) is the usual safe
default.
You can alter your write cache settings using Doug Gilbert's
sg3-utils ... but be warned, enabling the write cache without battery
backing in an array is a dangerous thing to do since most arrays have
huge caches, they either ignore SYNCHRONIZE CACHE (which would leave you
vulnerable to data loss on power failure) or take such a long time, it
would kill performance.
James
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^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug 13499] Write cache: disabled, read cache: enabled, supports DPO and FUA? it's bug???
2009-06-10 13:59 [Bug 13499] New: " bugzilla-daemon
2009-06-10 14:00 ` [Bug 13499] " bugzilla-daemon
2009-06-10 14:14 ` bugzilla-daemon
@ 2009-06-10 17:04 ` bugzilla-daemon
2 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2009-06-10 17:04 UTC (permalink / raw)
To: linux-scsi
http://bugzilla.kernel.org/show_bug.cgi?id=13499
--- Comment #3 from ping.li <lxy9805287@163.com> 2009-06-10 17:04:29 ---
1. BBU status is ok
./MegaCli64 -AdpBbuCmd -GetBbuStatus -a0
BBU status for Adapter: 0
BatteryType: BBU
Voltage: 4058 mV
Current: 0 mA
Temperature: 19 C
Firmware Status: 00000000
Battery state:
GasGuageStatus:
Fully Discharged : No
Fully Charged : Yes
Discharging : Yes
Initialized : Yes
Remaining Time Alarm : No
Remaining Capacity Alarm: No
Discharge Terminated : No
Over Temperature : No
Charging Terminated : Yes
Over Charged : No
Relative State of Charge: 98 %
Charger Status: Complete
Remaining Capacity: 1634 mAh
Full Charge Capacity: 1662 mAh
isSOHGood: Yes
2. Cache Policy is default,and try change setting but problem still.
./MegaCli64 -LDinfo -L0 -a0
Adapter 0 -- Virtual Drive Information:
Virtual Disk: 0 (target id: 0)
Name:
RAID Level: Primary-5, Secondary-0, RAID Level Qualifier-3
Size:975744MB
State: Optimal
Stripe Size: 64kB
Number Of Drives:8
Span Depth:1
Default Cache Policy: WriteBack, ReadAheadNone, Direct, Write Cache OK if Bad
BBU
Current Cache Policy: WriteBack, ReadAheadNone, Direct, Write Cache OK if Bad
BBU
Access Policy: Read/Write
Disk Cache Policy: Enabled
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-06-08 11:47 UTC | newest]
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2012-06-08 11:47 ` [Bug 13499] Write cache: disabled, read cache: enabled, supports DPO and FUA? it's bug??? bugzilla-daemon
2012-06-08 11:47 ` bugzilla-daemon
2009-06-10 13:59 [Bug 13499] New: " bugzilla-daemon
2009-06-10 14:00 ` [Bug 13499] " bugzilla-daemon
2009-06-10 14:14 ` James Bottomley
2009-06-10 14:14 ` bugzilla-daemon
2009-06-10 17:04 ` bugzilla-daemon
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