I don't think it's a mis-alignment, I didn't "move" the LUN, it was created via filer view with the AIX type, so should be aligned, no?
Jeremy M. Page____________________
Systems Architect
* email:Jeremy.Page@gilbarco.com - * phone: 336.547.5399 - 6 fax: 336.547.5163 - * cell: 336.601.7274
________________________________
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Nicholas Bernstein Sent: Tuesday, October 07, 2008 9:01 AM To: Toasters Subject: Re: AIX over FC speed issues
Whenever I hear of a lun being ported from one system to another and loosing performance, the first thing I think of is block mis-alignment. Check out the following doc:
https://now.netapp.com/Knowledgebase/solutionarea.asp?id=kb36120
I'd also look at stats show lun, which can give you io statistics on a per-lun basis and neat things like write latency.
Cheers, Nick
On 10/7/08 5:15 AM, "Page, Jeremy" jeremy.page@gilbarco.com wrote:
We've replaced our DS4500 and EMC systems with an IBM rebranded 3070 cluster. For the most part I'm very pleased with the performance but for a specific application the new system is about 15% slower then the old DS4500 was, even though it's got more spindles at the same speed then originally.
Old system (DS4500) (15k FC) 8 disks in a RAID 5 array 10 in a RAID 10 array 2 more mirrored
New system (3070A) (15k FC) < This box is idling, the only stuff on it is this application (most stuff is on the other controller since I knew this app was a pain) 3 12 disk RAID groups in a single aggr (DP)
Should be 20 versus 30 spindles. I understand that there may be a slight impact from DP versus RAID0/10 for parity calculations, but I expected it to be more then absorbed by the 16x size cache on the Netapp, the extra spindles and the NVRAM for writes. So any suggestions on how to speed this up would be useful. I'm going to have the AIX guy re-run his tests tonight while I have statit running to capture how the disks are impacted but I think possibly the bottleneck is elsewhere. Below are the test results from Sunday.
IBM SAN Stats (READ)
Benchmark Statistics for Database DB Name: /vrback1/vrdata1/veeder Proc Date: 10/05/08 Reading part master file
Records Start End Duration ---------- -------- -------- -------- pt_mstr 52,674 12:50:30 12:50:52 00:00:22 reading customer master file
Records Start End Duration ---------- -------- -------- -------- cm_mstr 17,984 12:50:52 12:51:14 00:00:22 reading order headers
Records Start End Duration ---------- -------- -------- -------- so_mstr 4,213 12:51:20 12:51:28 00:00:08 reading order detail
Records Start End Duration ---------- -------- -------- -------- sod_det 11,210 12:51:28 12:51:41 00:00:13 reading routing records
Records Start End Duration ---------- -------- -------- -------- ro_det 87,514 12:51:52 12:52:13 00:00:21 reading address master file
Records Start End Duration ---------- -------- -------- -------- ad_mstr 279,824 12:52:13 12:57:14 00:05:01 read install base records
Records Start End Duration ---------- -------- -------- -------- isb_mstr 639,999 12:57:19 13:06:18 00:08:59 Read invoice detail file
Records Start End Duration ---------- -------- -------- -------- idh_hist 4,573,493 13:06:18 13:57:25 00:51:07
NetAPPSAN Stats (READ)
Benchmark Statistics for Database DB Name: /vrdata1_mr/veeder Proc Date: 05/10/08 Reading pt_mstr
Records Start End Duration ---------- -------- -------- -------- pt_mstr 52,674 12:43:08 12:43:43 00:00:35 reading customer master file
Records Start End Duration ---------- -------- -------- -------- cm_mstr 17,984 12:43:43 12:44:12 00:00:29 reading order headers
Records Start End Duration ---------- -------- -------- -------- so_mstr 4,213 12:44:19 12:44:35 00:00:16 reading order detail
Records Start End Duration ---------- -------- -------- -------- sod_det 11,210 12:44:35 12:44:57 00:00:22 reading routing records
Records Start End Duration ---------- -------- -------- -------- ro_det 87,514 12:45:00 12:45:27 00:00:27 reading address master file
Records Start End Duration ---------- -------- -------- -------- ad_mstr 279,824 12:45:27 12:51:48 00:06:21 read install base records
Records Start End Duration ---------- -------- -------- -------- isb_mstr 639,999 12:51:55 13:02:56 00:11:01 Read invoice detail file
Records Start End Duration ---------- -------- -------- -------- idh_hist 4,573,493 13:02:56 13:47:13 00:44:17
IBM SAN Stats (Write)
R,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,T .wrote 100,000 records . ./spare3/qad86edb/bmark . . Start: 09:04:09 . . End: 09:05:30 . . Duration: 00:01:21 . F,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,G
NetAPPSAN Stats (Write)
R,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,T .wrote 100,000 records . ./spare5_mr/bmark . . Start: 09:09:38 . . End: 09:11:14 . . Duration: 00:01:36 . F,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,G
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