Max IO size - File System vs Raw

From: Connor McDonald <hamcdc_at_yahoo.co.uk>
Date: Thu, 06 Sep 2001 06:18:25 -0700
Message-ID: <F001.00384FDA.20010906051055@fatcity.com>

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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Received on Thu Sep 06 2001 - 08:18:25 CDT