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| Title: | LSM |
|
| Moderator: | SMURF::SHIDERLY |
|
| Created: | Mon Jan 17 1994 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 803 |
| Total number of notes: | 2852 |
774.0. "Poor I/O performance. Help " by HYDRA::LNARAYAN () Wed Mar 26 1997 19:16
Hello
Here is a customer benchmark suituation, which may need your
attention/help! The application uses MFCOBOL/UNIKIX (tp monitor)
a financial application doing batch processing ( sequential
read/write ) The database is striped across 9 mirrored LSM volumes
of 18 disks. And two other striped LSM volumes with other data.
The I/O performance seems to be very slow. There are 8 cpus of which
7 are idle and the active ones spends 50% user time, 49% on wait
and the remaining 1% system time.
There is no paging/swaping activity and the iostat says that it doing
I/O at an average of about 100 kbps on each disk. I guess that the
cpu wait is for disk I/O? Can someone help us?
Thanks In Advance
Lakshminarayan
Config
DEC 8400 5/440 with 4 GB memory, 8 SCSI controller with 36 disk(RZ28M)
distributed on it.
Digital UNIX V4.0, LSM V4.0, MF-COBOL V3.2A
The output of the commands voldis list, volprint -Avht, volprint -Apl,
volprint -Avl are given below
voldis list
DEVICE TYPE DISK GROUP STATUS
rz10c simple rz10c rootdg online
rz11c simple rz11c rootdg online
rz12c simple rz12c rootdg online
rz13c simple rz13c rootdg online
rz14c simple rz14c rootdg online
rz18c simple rz18c rootdg online
rz19c simple rz19c rootdg online
rz20c simple rz20c rootdg online
rz21c simple rz21c rootdg online
rz22c simple rz22c rootdg online
rz2c simple rz2c rootdg online
rz34c simple rz34c rootdg online
rz35c simple rz35c rootdg online
rz36c simple rz36c rootdg online
rz37c simple rz37c rootdg online
rz38c simple rz38c rootdg online
rz3c simple rz3c rootdg online
rz41c simple rz41c rootdg online
rz42c simple rz42c rootdg online
rz43c simple rz43c rootdg online
rz44c simple rz44c rootdg online
rz45c simple rz45c rootdg online
rz46c simple rz46c rootdg online
rz49c simple rz49c rootdg online
rz4c simple rz4c rootdg online
rz50c simple rz50c rootdg online
rz51c simple rz51c rootdg online
rz52c simple rz52c rootdg online
rz53c simple rz53c rootdg online
rz54c simple rz54c rootdg online
rz5c simple rz5c rootdg online
rz6c simple rz6c rootdg online
volprint -Avht
Disk group: rootdg
V NAME USETYPE KSTATE STATE LENGTH READPOL PREFPLEX
PL NAME VOLUME KSTATE STATE LENGTH LAYOUT ST-WIDTH MODE
SD NAME PLEX PLOFFS DISKOFFS LENGTH DISK-NAME DEVICE
v g2_vol1 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol1-01 g2_vol1 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz2c-01 g2_vol1-01 0 0 4109440 rz2c rz2c
pl g2_vol1-02 g2_vol1 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz10c-01 g2_vol1-02 0 0 4109440 rz10c rz10c
v g2_vol2 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol2-01 g2_vol2 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz3c-01 g2_vol2-01 0 0 4109440 rz3c rz3c
pl g2_vol2-02 g2_vol2 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz11c-01 g2_vol2-02 0 0 4109440 rz11c rz11c
v g2_vol3 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol3-01 g2_vol3 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz4c-01 g2_vol3-01 0 0 4109440 rz4c rz4c
pl g2_vol3-02 g2_vol3 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz12c-01 g2_vol3-02 0 0 4109440 rz12c rz12c
v g2_vol4 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol4-01 g2_vol4 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz18c-01 g2_vol4-01 0 0 4109440 rz18c rz18c
pl g2_vol4-02 g2_vol4 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz34c-01 g2_vol4-02 0 0 4109440 rz34c rz34c
v g2_vol5 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol5-01 g2_vol5 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz19c-01 g2_vol5-01 0 0 4109440 rz19c rz19c
pl g2_vol5-02 g2_vol5 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz35c-01 g2_vol5-02 0 0 4109440 rz35c rz35c
v g2_vol6 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol6-01 g2_vol6 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz41c-01 g2_vol6-01 0 0 4109440 rz41c rz41c
pl g2_vol6-02 g2_vol6 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz49c-01 g2_vol6-02 0 0 4109440 rz49c rz49c
v g2_vol7 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol7-01 g2_vol7 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz42c-01 g2_vol7-01 0 0 4109440 rz42c rz42c
pl g2_vol7-02 g2_vol7 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz50c-01 g2_vol7-02 0 0 4109440 rz50c rz50c
v g2_vol8 fsgen ENABLED ACTIVE 4109440 SELECT -
pl g2_vol8-01 g2_vol8 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz43c-01 g2_vol8-01 0 0 4109440 rz43c rz43c
pl g2_vol8-02 g2_vol8 ENABLED ACTIVE 4109440 CONCAT - RW
sd rz51c-01 g2_vol8-02 0 0 4109440 rz51c rz51c
v g3_vol fsgen ENABLED ACTIVE 16437760 ROUND -
pl g3_mir g3_vol ENABLED ACTIVE 16437760 STRIPE 128 RW
sd rz5c-01 g3_mir 0 0 4109440 rz5c rz5c
sd rz13c-01 g3_mir 4109440 0 4109440 rz13c rz13c
sd rz21c-01 g3_mir 8218880 0 4109440 rz21c rz21c
sd rz37c-01 g3_mir 12328320 0 4109440 rz37c rz37c
pl g3_plex g3_vol ENABLED ACTIVE 16437760 STRIPE 128 RW
sd rz20c-01 g3_plex 0 0 4109440 rz20c rz20c
sd rz36c-01 g3_plex 4109440 0 4109440 rz36c rz36c
sd rz44c-01 g3_plex 8218880 0 4109440 rz44c rz44c
sd rz52c-01 g3_plex 12328320 0 4109440 rz52c rz52c
v g4_vol fsgen ENABLED ACTIVE 16437760 ROUND -
pl g4_plex g4_vol ENABLED ACTIVE 16437760 STRIPE 128 RW
sd rz45c-01 g4_plex 0 0 4109440 rz45c rz45c
sd rz53c-01 g4_plex 4109440 0 4109440 rz53c rz53c
sd rz6c-01 g4_plex 8218880 0 4109440 rz6c rz6c
sd rz14c-01 g4_plex 12328320 0 4109440 rz14c rz14c
v g5_vol fsgen ENABLED ACTIVE 16437760 ROUND -
pl g5_plex g5_vol ENABLED ACTIVE 16437760 STRIPE 128 RW
sd rz22c-01 g5_plex 0 0 4109440 rz22c rz22c
sd rz38c-01 g5_plex 4109440 0 4109440 rz38c rz38c
sd rz46c-01 g5_plex 8218880 0 4109440 rz46c rz46c
sd rz54c-01 g5_plex 12328320 0 4109440 rz54c rz54c
volprint -Apl
Disk group: rootdg
Plex: g2_vol1-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol1 sd=rz2c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol1-01
Plex: g2_vol1-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol1 sd=rz10c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol1-02
Plex: g2_vol2-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol2 sd=rz3c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol2-01
Plex: g2_vol2-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol2 sd=rz11c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol2-02
Plex: g2_vol3-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol3 sd=rz4c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol3-01
Plex: g2_vol3-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol3 sd=rz12c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol3-02
Plex: g2_vol4-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol4 sd=rz18c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol4-01
Plex: g2_vol4-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol4 sd=rz34c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol4-02
Plex: g2_vol5-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol5 sd=rz19c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol5-01
Plex: g2_vol5-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol5 sd=rz35c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol5-02
Plex: g2_vol6-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol6 sd=rz41c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol6-01
Plex: g2_vol6-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol6 sd=rz49c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol6-02
Plex: g2_vol7-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol7 sd=rz42c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol7-01
Plex: g2_vol7-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol7 sd=rz50c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol7-02
Plex: g2_vol8-01
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol8 sd=rz43c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol8-01
Plex: g2_vol8-02
info: len=4109440
type: layout=CONCAT
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g2_vol8 sd=rz51c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g2_vol8-02
Plex: g3_mir
info: len=16437760
type: layout=STRIPE width=128
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g3_vol sd=rz5c-01,rz13c-01,rz21c-01,rz37c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g3_mir
Plex: g3_plex
info: len=16437760
type: layout=STRIPE width=128
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g3_vol sd=rz20c-01,rz36c-01,rz44c-01,rz52c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g3_plex
Plex: g4_plex
info: len=16437760
type: layout=STRIPE width=128
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g4_vol sd=rz45c-01,rz53c-01,rz6c-01,rz14c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g4_plex
Plex: g5_plex
info: len=16437760
type: layout=STRIPE width=128
state: state=ACTIVE kernel=ENABLED io=read-write
assoc: vol=g5_vol sd=rz22c-01,rz38c-01,rz46c-01,rz54c-01
flags: closed complete
device: dev=42/42 path=/dev/plex/rootdg/g5_plex
volprint -Avl
Disk group: rootdg
Volume: g2_vol1
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol1-01,g2_vol1-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=5 bdev=40/5 cdev=40/5 path=/dev/vol/rootdg/g2_vol1
perms: user=root group=system mode=0600
Volume: g2_vol2
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol2-01,g2_vol2-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=6 bdev=40/6 cdev=40/6 path=/dev/vol/rootdg/g2_vol2
perms: user=root group=system mode=0600
Volume: g2_vol3
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol3-01,g2_vol3-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=7 bdev=40/7 cdev=40/7 path=/dev/vol/rootdg/g2_vol3
perms: user=root group=system mode=0600
Volume: g2_vol4
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol4-01,g2_vol4-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=8 bdev=40/8 cdev=40/8 path=/dev/vol/rootdg/g2_vol4
perms: user=root group=system mode=0600
Volume: g2_vol5
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol5-01,g2_vol5-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=9 bdev=40/9 cdev=40/9 path=/dev/vol/rootdg/g2_vol5
perms: user=root group=system mode=0600
Volume: g2_vol6
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol6-01,g2_vol6-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=10 bdev=40/10 cdev=40/10 path=/dev/vol/rootdg/g2_vol6
perms: user=root group=system mode=0600
Volume: g2_vol7
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol7-01,g2_vol7-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=11 bdev=40/11 cdev=40/11 path=/dev/vol/rootdg/g2_vol7
perms: user=root group=system mode=0600
Volume: g2_vol8
info: len=4109440
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g2_vol8-01,g2_vol8-02
policies: read=SELECT (round-robin) exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=12 bdev=40/12 cdev=40/12 path=/dev/vol/rootdg/g2_vol8
perms: user=root group=system mode=0600
Volume: g3_vol
info: len=16437760
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g3_mir,g3_plex
policies: read=ROUND exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=13 bdev=40/13 cdev=40/13 path=/dev/vol/rootdg/g3_vol
perms: user=root group=system mode=0600
Volume: g4_vol
info: len=16437760
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g4_plex
policies: read=ROUND exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=14 bdev=40/14 cdev=40/14 path=/dev/vol/rootdg/g4_vol
perms: user=root group=system mode=0600
Volume: g5_vol
info: len=16437760
type: usetype=fsgen
state: state=ACTIVE kernel=ENABLED
assoc: plexes=g5_plex
policies: read=ROUND exceptions=GEN_DET_SPARSE
flags: open writeback
logging: type=BLKNO loglen=1 serial=0/0 (disabled)
device: minor=15 bdev=40/15 cdev=40/15 path=/dev/vol/rootdg/g5_vol
perms: user=root group=system mode=0600
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 774.1 | please run performanc monitoring tools | NETRIX::"[email protected]" | | Tue Apr 01 1997 11:12 | 12 |
| Hi,
Could you try running the volstat and monitor tools while your
benchmark is running? The monitor tool is available from
ftp://ftp.digital.com/pub/DEC/. For volstat, please post the interval
time you use and the number of operations and blocks per interval per
volume. For monitor, please post the kps, tps, and queue length per
disk.
Thanks.
[Posted by WWW Notes gateway]
|
| 774.2 | | KITCHE::schott | Eric R. Schott USG Product Management | Tue Apr 01 1997 21:21 | 5 |
| You might also try collect
see http://www-unix.zk3.dec.com/tuning/tools/tools.html
|
| 774.3 | Thanks for the inputs, ... | HYDRA::LNARAYAN | | Tue Apr 08 1997 11:26 | 10 |
| Hi
Thank You for the inputs. We found that after seleting delayed writes
with non-synchronous write, the benchmark results we interesting and
encouraging. Now the timings are good. But I have another question.
I have posted the question in the ASK_SSAG, Now I'll post it here as a
reply.
Thank YOu
Lakshminarayan
|
| 774.4 | performance difference | HYDRA::LNARAYAN | | Tue Apr 08 1997 11:29 | 96 |
| <<< SSAG::DISK$ARCH2:[NOTES$LIBRARY.SSAG]ASK_SSAG.NOTE;32767 >>>
-< Ask the Storage Architecture Group >-
================================================================================
Note 6543.0 help! identify performance difference No replies
HYDRA::LNARAYAN 89 lines 2-APR-1997 15:49
--------------------------------------------------------------------------------
A recent benchmark results show some strange behavior.
This is a MF-COBOL application with unikix
(CICS for UNIX) a sequential read/write application.
We found the same application/program (with similar set of data)
that took 8 minutes on the the volumes 6,7 & 8, whereas it took
23 minutes on the volumes 1,2,3.
This process is a part of the benchmark, which uncompresses and untar's
8 files on eight volumes ( all are similar )
The volumes are shown below.
My question is Why is the difference? can some one help me identify
this?
Thanks In Advance
Nari
Config:
S/W
Digital UNIX V4.0
LSM v4.0
MF COBOL 3.2A
swap 4 gb
console firmware revision 4.0
H/W
System Alphaserver 8400 5/440
memory 4 GB
When I issue show config on the console, it lists me
on C0 four controller isp0 to isp3
and on C1 four controller kzpsa0 to kzpsa3. I dont know the
characteristics of these isp's, it came with the system as
default I guess.
the following is the SCSI device configuration
| isp0 BA350
|-----------------------------------------------------
| | | | | | |
P | rz28 rz28m rz28m rz28 rz28 rz28
| rz1 rz2 rz3 rz4 rz5 rz6
| isp1 BA356
|-----------------------------------------------------
C | | | | | | |
| rz28 rz28 rz28 rz28 rz28 rz28
| rz9 rz10 zr11 rz12 rz13 rz14
| isp2 BA356
I |-----------------------------------------------------
| | | | | | |
| st3255 st3255 st3255 st3255 st3255 st3255 ----> all are ST3255OW
| rz17 rz18 rz19 rz20 rz21 rz22
| isp3
B |------------------------------------------------------
| |
| rrd43
| rz29
U | kzpsa0 BA350
|------------------------------------------------------
| | | | | | |
S | rz28 rz28 rz28 rz28 rz28m rz28
| rz33 rz34 rz35 rz36 rz37 rz38
| kzpsa1 BA350
|------------------------------------------------------
| | | | | | |
| rz28 rz28 rz28 rz28 rz28 rz28m
| rz41 rz42 rz43 rz44 rz45 rz46
| kzpsa2 BA350
|-----------------------------------------------------
| | | | | | |
| rz28m rz28m rz28m rz28m rz28m rz28m
| rz49 rz50 rz51 rz52 rz53 rz54
| kzpsa3 BA350
|------------------------------------------------------
| | |
| tlz06 tlz06
LSM mirrored volumes (one full disk is mirrored to another, the c partition)
vol1 vol2 vol3 vol4 vol5 vol6 vol7 vol8
--------------------------------------------------------------------------
| | | | | | | |
rz2c rz3c rz4c rz18c rz19c rz41c rz42c rz43c
rz10c rz11c rz12c rz34c rz35c rz49c rz50c rz51c ----->
mirrors
|
| 774.5 | | NABETH::alan | Dr. File System's Home for Wayward Inodes. | Tue Apr 08 1997 21:10 | 45 |
| The ISP controllers are Fast/Wide/Differential (and single-ended)
SCSI adapters using the Qlogic ISP1020 chip(set). One of the
single-ended and three differential versions of this adapter are
used in the KFTIA of the DEC 8200/8400 systems. The KZPSA is a
Fast/Wide/Differential adapter built around some NCR chip(set)
(I think).
Reorganizing your drawing we have:
vol1
rz2� - RZ28M at isp0
rz10 - RZ28 at isp1
vol2
rz3 - RZ28M at isp0
rz11 - RZ28 at isp1
vol3
rz4 - RZ28 at isp0
rz12 - RZ28 at isp1
vol6
rz41 - RZ28 at kzpsa1
rz49 - RZ28M at kzpsa2
vol7
rz42 - RZ28 at kzpsa1
rz50 - RZ28M at kzpsa2
vol8
rz43 - RZ28 at kzpsa1
rz51 - RZ28M at kzpsa2
With the exception of vol3 all the volumes are made of pairs
of RZ28s and RZ28Ms. While these disks have the same capacity
they aren't the same disk and the RZ28M may be faster in some
circumstances. For writing the I/O should be limited by the
slower of the disks, but reads may perform differently. Still,
with the volume generally balanced between one of each it
should even out, other things being equal.
The remaining obvious differences are the ISPs vs. the KZPSAs
and the BA350s vs. the BA356s. You really need someone from
the Storage Performance group to tell what the detailed
differences are between the two adapters.
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| 774.6 | Yes, that is true... | HYDRA::LNARAYAN | | Wed Apr 09 1997 12:37 | 13 |
| Hello
Thank You for your attention.
> The remaining obvious differences are the ISPs vs. the KZPSA
> and the BA350s vs. the BA356s. You really need someone from
> the Storage Performance group to tell what the detailed
> differences are between the two adapters.
Exactly, I am looking for this information.
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