Dear friends
I have a PowerEdge 2900 with two Intel(R) Xeon(R) CPU E5410 @
2.33GHz, 16384 MB RAM, eight disks (RAID 5), two logical disks (one is
300G for system, other is 6T, storing a bunch of images). Disks are
controlled by a PERC 6/i controller.
The disk policy is "No read ahead, write back", as reported by OMSA.
The server is running CentOS 5.2.
The problem we have is that, when moving large folders, even inside
the same ext3 partition, the system slows down and absolutely no disk
read can be done until the copy or the move finishes ("top" shows normal
use of CPU and memory).
I've noted that, in spite of the PERC reports that the disk policy is
"write back", dmesg shows the policy as "write through w/ FUA".
Does anybody have a hint on what is going on?
[]s
Bene
PS: It follows the uname, dmesg and OMSA report.
*# uname -a*
Linux erez.cria.org.br 2.6.18-92.1.18.el5xen #1 SMP Wed Nov 12 09:48:10
EST 2008 x86_64 x86_64 x86_64 GNU/Linux
*#dmesg*
<...>
SCSI device sda: 614399744 512-byte hdwr sectors (314573 MB)
sda: Write Protect is off
sda: Mode Sense: 1f 00 10 08
SCSI device sda: drive cache: write through w/ FUA
SCSI device sda: 614399744 512-byte hdwr sectors (314573 MB)
sda: Write Protect is off
sda: Mode Sense: 1f 00 10 08
SCSI device sda: drive cache: write through w/ FUA
sda: sda1 sda2
sd 0:2:0:0: Attached scsi disk sda
Vendor: DELL Model: PERC 6/i Rev: 1.21
Type: Direct-Access ANSI SCSI revision: 05
sdb : very big device. try to use READ CAPACITY(16).
SCSI device sdb: 13052739840 512-byte hdwr sectors (6683003 MB)
sdb: Write Protect is off
sdb: Mode Sense: 1f 00 10 08
SCSI device sdb: drive cache: write through w/ FUA
sdb : very big device. try to use READ CAPACITY(16).
SCSI device sdb: 13052739840 512-byte hdwr sectors (6683003 MB)
sdb: Write Protect is off
sdb: Mode Sense: 1f 00 10 08
SCSI device sdb: drive cache: write through w/ FUA
sdb: sdb1
sd 0:2:1:0: Attached scsi disk sdb
<...>
*DELL OMSA info:*
Controller Information PERC 6/i Integrated
Properties : Non-Critical
Properties : Non-Critical
ID;Name;State;Firmware Version;Driver Version;Minimum Required Driver
Version;Number of Connectors;Rebuild Rate;BGI Rate;Check Consistency
Rate;Reconstruct Rate;Abort check consistency on error ;Allow Revertible
Hot Spare and Replace Member;Load balance;Auto replace member on
predictive failure;Cache Memory Size;Patrol Read Mode;Patrol Read
State;Patrol Read Iterations;Controller Tasks;
0;PERC 6/i Integrated;Degraded;6.1.1-0047;00.00.03.15-RH1
;00.00.03.20;2;30;30%;30%;30%;Disabled;Enabled;Auto;Disabled;256
MB;Auto;Stopped;47;Available Tasks;Execute
Virtual Disks
Status;Name;State;Layout;Size;Device Name;Type;Read Policy;Write
Policy;Stripe Element Size;Disk Cache Policy
Ok;Virtual Disk 0;Ready;RAID-5;292.97GB;/dev/sda;SATA;No Read
Ahead;Write Back;64 KB;Enabled
Ok;Virtual Disk 1;Ready;RAID-5;6,224.03GB;/dev/sdb;SATA;No Read
Ahead;Write Back;64 KB;Enabled
Battery
Status;Name;State;Predicted Capacity Status;Learn State;Next Learn
Time;Maximum Learn Delay;Learn Mode
Ok;Battery 0;Ready;Ready;Idle;26 days 10 hours;7 days 0 hours;Auto
Connectors
Status;Name;State;Connector Type
Ok;Connector 0;Ready;SAS Port RAID Mode
Ok;Connector 1;Ready;SAS Port RAID Mode
Enclosures
Status;Name;State;Connector ;Firmware Version;Service Tag;SAS Address
Ok;Backplane;Ready;0;1.05;XXXXXXX;500220908CEA0700
Ok;Backplane;Ready;1;1.05;XXXXXXX;500220908CEA0700
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