SUMMARY III: Sybase performance

From: Kruchkoff, A (Alex) <Alex.Kruchkoff_at_SYD.RABOBANK.COM>
Date: Thu Nov 01 2001 - 00:14:04 EST
Hi, 

It looks like we're doomed to use Veritas: SDS4.2.1 has a bug: 4412626,
4347117, 4379098...

$ metastat -p d14
d14 1 1 c0t0d0s4
$ metainit d70 1 1 c4t0d0s4
metainit: <host>: metainit device d70 overlaps with device in d14

There is no patch available. 
The work around is to use SDS 4.2, which is not acceptable, because it does
not support soft partitions.

Thanks and regards
-Alex

-----Original Message-----
From: Kruchkoff, A (Alex) [mailto:Alex.Kruchkoff@SYD.RABOBANK.COM]
Sent: Thursday, 1 November 2001 11:21
To: sunmanagers@sunmanagers.org
Subject: SUMMARY II: Sybase performance


Sorry for the delay: instead of SUMMARY II, I just used RE: in the Subject: 
And as a result that mail was rejected. -Alex

Hi,

here is an update on my testing.
I install the VxVM. 

5) same 5 DB, raw devices are in /dev/vx/rdsk/. All DB are located on the
same disk. the same test: 0h 40m

thanks and regards
-Alex

-----Original Message-----
From: Kruchkoff, A (Alex) [mailto:Alex.Kruchkoff@SYD.RABOBANK.COM]
Sent: Friday, 26 October 2001 11:34
To: sunmanagers@sunmanagers.org
Subject: SUMMARY: Sybase performance


Sorry for the delay: we were doing some tests.

Thanks to Jeroen.Rijnbergen@seagate.com, andy.lee@orange.co.uk,
mahesh.hardikar@nl.fortisbank.com, and Darren Dunham [ddunham@taos.com]

Suggested solutions were:

1) don't use lofi devices, use files to which lofi devices pointed (fs
mounted with `forcedirectio')
2) use new feature from SDS 4.2.1 called `soft partitions' (to avoid the
Solaris limitation of 8 partitions per disk)
3) use VxVM.

TESTS.

ASE 12.5; 
5 db: 4110Mb; 4110Mb; 610Mb; 310Mb; 610Mb; pagesize - 2K.

1) using lofi devices pointing to files on the fs mounted with
forcedirectio: 2h 45m
2) using files on the fs mounted with forcedirectio: 2h 14m
3) using lofi as in 1) but splitting: 3 db on 1 disk and 2 db on another
disk: 1h 37m
3) using raw devices as disk slices (not acceptable: solaris 8 slices
limitation): 0h 36m
4) using raw devices as soft partitions (I applied the patch 108693-07): 0h
32m

I have not tested VxVM yet, but I will: I'm just preparing the environment.

*VxVM question* to the list: I know I can encapsulate the existing disk to
the Veritas,
but when I finish the test, How to de-encapsulate (restore) the disk which
is under control of VxVM?
(I know I can reformat the disk, make new fs and restore the data, but it's
a long way...)

thanks a lot.

rgds 
Alex

my original post:

-----Original Message-----
From: Kruchkoff, A (Alex) [mailto:Alex.Kruchkoff@SYD.RABOBANK.COM]
Sent: Tuesday, 23 October 2001 16:17
To: sunmanagers@sunmanagers.org
Subject: Sybase performance


Hi

we have a sun e450 with 64-bits solaris 8 and sun StorEdge SRC/P Intelligent
SCSI RAID controller with disks which are configured as RAID 1+0.

DBA use Sybase and they want to have a lot of small raw devices. 
The limitation of Solaris is 8 partitions per disk.
If I allocate 8 small (1 Gb) raw devices I would not be able to access the
rest of the disk.
Solaris 8 has a loopback file system: a character/block device could be
associated with the file. 
I can mount a filesystem with `forcedirectio' and build the loopback devices
for files located on that filesystem.
And use that lofi devices for Sybase DB.

When I have more than 30 lofi devices the performance of Sybase is
decreasing:
top shows 49.7% idle 22.7% user 27.6% kernel 0.0% iowait 0.0%swap 
My question is: will the performance of Sybase increase if I'll use veritas
volume manager?

(A few weeks ago we did some testing: we allocated small raw devices under
veritas and lofi and did simple dd testing.
Reading/Writing a lofi device was faster than reading/writing similar size
veritas device 2 boxes were identical, same raid 1+0. But for testing we use
1 raw device only, not 35).

And another question: what are other advantages of the veritas volume
manager?
We don't need to use mirroring (RAID controller does mirroring, striping,
hot spare).

Thanks, I will summarise.

Alex


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Received on Wed Oct 31 22:16:34 2001

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