Read, Write & Cache Best Settings for a NFS fileserver (XFS and Linux 2.6.15)

David McGiven david.mcgiven at fusemail.com
Fri May 19 06:20:27 CDT 2006


Dear List,

I have a Dell PE2850 with a PERC4e/Di Controller.

The system has 6 SCSI disks with the following scenario :

- Disks 0 & 1 in RAID 1 for OS
- Disks 2, 3 & 4 in RAID 5 for Data
- Disk 5 as a hot spare

Disk performance on the RAID5 vdisk is EXTREMELY slow compared to
performance on the RAID1 vdisk.

I've tried XFS and ext3 and both are extremely slow. I'm using Linux
Kernel 2.6.15 (Debian version).

# /opt/dell/srvadmin/oma/bin/omreport storage vdisk controller=0
List of Virtual Disks on Controller PERC 4e/Di (Not Available)

Controller PERC 4e/Di (Not Available)
ID           : 0
Status       : Ok
Name         : Virtual Disk 0
State        : Ready
Progress     : Not Applicable
Layout       : RAID-1
Size         : 136.62 GB (146695782400 bytes)
Device Name  : /dev/sda
Read Policy  : Adaptive Read Ahead
Write Policy : Write Through
Cache Policy : Direct I/O
Stripe Size  : 64 KB

ID           : 1
Status       : Ok
Name         : Virtual Disk 1
State        : Ready
Progress     : Not Applicable
Layout       : RAID-5
Size         : 273.24 GB (293391564800 bytes)
Device Name  : /dev/sdb
Read Policy  : Adaptive Read Ahead
Write Policy : Write Through
Cache Policy : Direct I/O
Stripe Size  : 64 KB


My question is :

Which are the best READ/WRITE and CACHE options for a fileserver that will
serve files over NFS ?


Best Regards,
David McGiven.



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