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| Title: | + OpenVMS Clusters - The best clusters in the world! + |
| Notice: | This conference is COMPANY CONFIDENTIAL. See #1.3 |
| Moderator: | PROXY::MOORE |
|
| Created: | Fri Aug 26 1988 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 5320 |
| Total number of notes: | 23384 |
5232.0. "CI Bottleneck due to HSJ50 ??" by PRSPSU::BOUGEANT (MCS Antony ...) Tue Feb 18 1997 11:46
Hi,
Since we've upgraded our HSJ42s to HSJ52s, we don't have attented
performances (+300% I/Os up to 4600 I/O per seconde and +200% thruput
up to 12,7 MB per seconde with a size of 4KB unit transfert).
Configuration:
- OVMS V6.2
- Cluster of 6 AS8000-5/440 with 2 CIXCD on each (rev ucode 8)
- 2 Star Coupler
- 9 HSJ52 with 64MB cache (HSOF V5.0J-1)
- many RZ29s (rev 14) RZ28s (rev D442) and some EZ54 (rev 098)
EZ64 (rev 064)
VIOC is disabled (for the moment) and about 90% of I/Os are Read
operations (with small I/Os size , about 5 KB).
All units on HSJ have of MAXIMUM_CACHE_TRANSFERT_SIZE of 64 blocks
and WRITEBACK_CACHE enabled .
Below are CI statistics when user response time problem occurs;
at same time, on an electronic disk (EZ64) which is very used,
QUEUE LENGTH groows from 2 to 20 and RESPONSE TIME from 20ms to 150ms
(THRUPUT=1500MB,I/O rate =700).
A site audit seems to tell that CI Bandwidth is the bottleneck ?
If I remember, CIXCD is able to use both paths A and B at same time
only if remote node is not the same node. In fact, each path has a
bandwidth of 8,75MB (70Mb), 17,5MB for both.
Below BLOCK TRANSFERTS KB THRUPUT reports for CI-0 7,2MB; I think
that value is used only for data blocks , not for ACK/NOACK. But in
this case, we don't achive 17,5MB ?
Has anybody an idea (at least about xmit/receive on both paths) ?
Regards.
Luc BOUGEANT.
Block
Cir- Path Data- Mess- Disk Disk Transfers
cuit Node Component Name grams ages Operations KB Thruput KB Thruput
------ ------ --------- ---- ----- ----- ---------- ---------- ----------
CI-0 ** total ** 0.0 20116 1965.1 7142.2 7263.0
CI-0 ARAGON UNKNOWN PNA0 0.0 8736.0 210.3 646.3 654.4
CI-0 BARRES UNKNOWN PNA0 0.0 3269.7 832.1 4251.4 4345.3
CI-0 GIDE UNKNOWN PNA0 0.0 7309.4 188.8 494.6 502.6
CI-0 HSJA00 0.0 538.0 280.9 1328.1 1367.9
CI-0 HSJA01 0.0 684.6 343.5 902.4 903.0
CI-0 HSJA02 0.0 313.6 156.8 990.9 991.1
CI-0 HSJA03 0.0 237.5 119.1 560.3 560.5
CI-0 HSJA04 0.0 751.6 377.7 1056.6 1056.8
CI-0 HSJA05 0.0 567.7 286.1 1331.1 1368.5
CI-0 HSJA06 0.0 145.2 73.2 173.0 173.0
CI-0 HSJA07 0.0 334.4 168.2 363.2 363.4
CI-0 HSJA08 0.0 270.0 136.1 332.6 333.3
CI-0 HSJA09 0.0 47.1 23.5 104.2 104.3
CI-0 LOTI UNKNOWN PNA0 0.0 8757.9 187.9 708.8 720.6
CI-0 MORAND UNKNOWN PNA0 0.0 7330.7 390.5 793.4 810.6
CI-0 PROUST UNKNOWN PNA0 0.0 939.1 155.6 247.7 270.6
CI-1 ** total ** 0.0 3553.2 1631.8 6071.1 6211.7
CI-1 ARAGON UNKNOWN PNB0 0.0 375.0 167.8 540.0 602.6
CI-1 BARRES UNKNOWN PNB0 0.0 1475.9 733.7 3768.9 3810.7
CI-1 GIDE UNKNOWN PNB0 0.0 284.5 139.6 401.9 404.5
CI-1 HSJB00 0.0 434.9 215.8 454.3 457.8
CI-1 HSJB01 0.0 29.8 14.9 66.7 66.7
CI-1 HSJB02 0.0 1052.3 508.8 1813.7 1918.0
CI-1 HSJB03 0.0 343.7 171.3 643.0 645.2
CI-1 HSJB04 0.0 387.6 192.9 591.0 595.2
CI-1 HSJB05 0.0 307.5 153.5 982.1 982.7
CI-1 HSJB06 0.0 336.9 168.3 832.6 833.2
CI-1 HSJB07 0.0 413.1 206.1 687.9 688.8
CI-1 HSJB08 0.0 0.1 0.0 0.0 0.0
CI-1 HSJB09 0.0 0.1 0.0 0.0 0.0
CI-1 LOTI UNKNOWN PNB0 0.0 282.8 140.6 496.2 497.8
CI-1 MORAND UNKNOWN PNB0 0.0 851.8 299.5 621.5 652.8
CI-1 PROUST UNKNOWN PNB0 0.0 530.3 150.6 242.7 267.2
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 5232.1 | Add more STAR's | ZUR01::GLAUS | Feel like Don Quijote... | Wed Feb 19 1997 04:22 | 8 |
| Adding faster HSJ's just dont give you more performance when
your lock and data traffic is that high already.
Adding another star or two will give you much more performance gain,
even better, go to 3-4 CIPCA's per Host and use the 4KB packet
and arbitration option (not currently used in your config).
Guido.
|