[rescue] playing with the new E250 ... disk performance vs. old PeeCee
magnus at yonderway.com
Sat Dec 16 16:28:07 CST 2006
OK well I have a better idea of what's in it now. 2x400MHz procs, 1GB
RAM (i.e. half the banks are empty), 1x72GB 15,000 RPM IBM drive (i.e.
no Sun disk label).
I have to check md5sums on my Solaris 10 DVD ISO or something because
this box refuses to even try and boot off of the CD that I burned. So I
don't have any time with Solaris on this box yet.
I did however successfully get Ubuntu 6.06 LTS on it. Some of the disk
benchmarks are surprising.
I have a Pee Cee of similar vintage to the E250, an old Pentium III
550MHz. It's got a 300GB PATA drive on the on-board IDE controller.
This Pentium box is not a server by any means. Just a workstation I
cobbled together from junk parts and is running as my home file server.
So running the same version of Linux on both machines, I ran "hdparm -T"
and "hdparm -t" on the hard disk of each box. I ran the commands 3x to
get a more meaningful idea of what to expect.
Timing O_DIRECT cached reads: 732 MB in 2.01 seconds = 364.52 MB/sec
Timing O_DIRECT cached reads: 744 MB in 2.00 seconds = 371.23 MB/sec
Timing O_DIRECT cached reads: 728 MB in 2.00 seconds = 363.98 MB/sec
Timing O_DIRECT disk reads: 52 MB in 3.03 seconds = 17.15 MB/sec
Timing O_DIRECT disk reads: 56 MB in 3.10 seconds = 18.06 MB/sec
Timing O_DIRECT disk reads: 50 MB in 3.04 seconds = 16.45 MB/sec
Timing cached reads: 540 MB in 2.01 seconds = 268.66 MB/sec
Timing cached reads: 544 MB in 2.00 seconds = 272.00 MB/sec
Timing cached reads: 536 MB in 2.00 seconds = 268.00 MB/sec
Timing buffered disk reads: 138 MB in 3.02 seconds = 45.70 MB/sec
Timing buffered disk reads: 148 MB in 3.04 seconds = 48.68 MB/sec
Timing buffered disk reads: 146 MB in 3.03 seconds = 48.18 MB/sec
Do the low direct disk read numbers for the Sun box surprise anyone? Am
I hitting a limitation of the SCSI controller here? I'm not too
familiar with the E250 platform yet and I was thinking maybe it had a
faster SCSI controller than that. Looks more like it maxes out at 20MB/sec.
If I'm maxing out on the SCSI controller, is there a decent PCI SCSI
card that is "correct" for these boxes that I can search for on eBay and
plug into my hot swap backplane to achieve better performance?
I was honestly expecting better disk I/O performance out of the Sun.
I'm a bit surprised.
Here is the "hdparm -I" output for the PeeCee drive (same command does
not work on the Sun):
ATA device, with non-removable media
Model Number: ST3300622A
Serial Number: 3NF1QBR0
Firmware Revision: 3.AAH
Supported: 7 6 5 4
Likely used: 7
Logical max current
cylinders 16383 65535
heads 16 1
sectors/track 63 63
CHS current addressable sectors: 4128705
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 586072368
device size with M = 1024*1024: 286168 MBytes
device size with M = 1000*1000: 300069 MBytes (300 GB)
LBA, IORDY(can be disabled)
Queue depth: 1
Standby timer values: spec'd by Standard, no device specific
R/W multiple sector transfer: Max = 16 Current = ?
Recommended acoustic management value: 208, current value: 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 *udma4 udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Write cache
* Power Management feature set
Security Mode feature set
* SMART feature set
* FLUSH CACHE EXT command
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* 48-bit Address feature set
SET MAX security extension
* DOWNLOAD MICROCODE cmd
* General Purpose Logging feature set
* SMART self-test
* SMART error logging
Master password revision code = 65534
not expired: security count
not supported: enhanced erase
HW reset results:
CBLID- above Vih
Device num = 0 determined by the jumper
On the Sun, /proc/scsi/sym53c8xx/0 is thus:
Chip sym53c875, device id 0xf, revision id 0x14
At PCI address 0001:00:03.0, IRQ 5,7e0
Min. period factor 12, Wide SCSI BUS
Max. started commands 448, max. commands per LUN 64
It looks like a "Wide SCSI" controller if I believed this, but that
would max it out at only 10MB/sec. So I think I'm missing something here.
/proc/scsi/scsi on the Sun describes the hard disk as:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: IBM-ESXS Model: DTN073C3UCDY10FN Rev: S27P
Type: Direct-Access ANSI SCSI revision: 03
More information about the rescue