On 5 Jul, 16:50, Martin Knoblauch <[email protected]> wrote:
Hi,
for a customer we are operating a rackful of HP/DL380/G4 boxes that
have given us some problems with system responsiveness under [I/O
triggered] system load.
[snip]
IIRC, the locking in the CCISS driver was pretty heavy until later in
the 2.6 series (2.6.16?) kernels; I don't think they were backported
to the 1000 or so patches that comprise RH EL 4 kernels.
With write performance being really poor on the Smartarray controllers
without the battery-backed write cache, and with less-good locking,
performance can really suck.
On a total quiescent hp DL380 G2 (dual PIII, 1.13GHz Tualatin 512KB
L2$) running RH EL 5 (2.6.18) with a 32MB SmartArray 5i controller
with 6x36GB 10K RPM SCSI disks and all latest firmware:
# dd if=/dev/cciss/c0d0p2 of=/dev/zero bs=1024k count=1000
509+1 records in
509+1 records out
534643200 bytes (535 MB) copied, 11.6336 seconds, 46.0 MB/s
# dd if=/dev/zero of=/dev/cciss/c0d0p2 bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 22.3091 seconds, 4.7 MB/s
Oh dear! There are internal performance problems with this controller.
The SmartArray 5i in the newer DL380 G3 (dual P4 2.8GHz, 512KB L2$) is
perhaps twice the read performance (PCI-X helps some) but still sucks.
I'd get the BBWC in or install another controller.
Daniel
--
Daniel J Blueman
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
