A lot of file system's have a max io of much lower than raw. In the earlier
Solaris's it was 64K, but as you see, it is now seems to be 256k. Under NT
is 128k without using raw.
To truly take advantage of MULTIBLOCK_READ_COUNT you need to use RAW file
system. HP_UX I believe can do as high as 1Mb for this.
"Do not criticize someone until you walked a mile in their shoes, that way
when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Thursday, September 06, 2001 9:11 AM
To: Multiple recipients of list ORACLE-L
Anyone know of any restrictions on the max physical IO
(under Solaris8) that is imposed by file systems? To illustrate -
Using a tablespace on a raw device under veritas vol
mgr
- maxphys is 512k
- vxio:vol_maxio is 512k
- db block size is 8k
- db multi read is 64
and as expected, a level 8, 10046 trace shows me that
I can get 512k max io...so far, so good
If I repeat the exercise after putting a file system
(vxfs or ufs) on this device, then the best I can get
is 256k.
Any Solaris internal people out there ?
Cheers
Connor
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