7 messages in org.freebsd.freebsd-fsRe: SCSI bus| From | Sent On | Attachments |
|---|---|---|
| vo...@express.ru | Mar 31, 2000 2:57 am | |
| Bernd Walter | Mar 31, 2000 11:57 am | |
| vo...@express.ru | Mar 31, 2000 12:01 pm | |
| Bernd Walter | Apr 2, 2000 1:01 am | |
| vo...@express.ru | Apr 2, 2000 4:37 am | |
| Adrian Chadd | Apr 2, 2000 6:53 am | |
| Terry Lambert | Apr 4, 2000 8:15 am |
| Subject: | Re: SCSI bus | |
|---|---|---|
| From: | vo...@express.ru (vo...@express.ru) | |
| Date: | Apr 2, 2000 4:37:48 am | |
| List: | org.freebsd.freebsd-fs | |
On Sun, 2 Apr 2000, Bernd Walter wrote:
I don't expect this to work because the readonly side can't know when the incore informations outdates.
Yes, it can be a problem, but may be this may be solved by disabling any cache on read-only side (or setting expire time in one sec) ?
You can't diable readcaching completely. Say you need the inode, then you will read it and finaly use it. You don't reread it for every single byte you access which creates some kind of read cache. And there are much more complex points like this sample.
Ok, have kernel algorithm to "expire" cached vnodes ? Or vnodes only pushed out by new pages ?
In my case writes - relative rare case then reads and I can wait for some timeout while my in-kernel vnodes will dropped to see new from disk
-- B.Walter COSMO-Project http://www.cosmo-project.de tic...@cicely.de Usergroup in...@cosmo-project.de
-- TSB Russian Express, Moscow Vladimir B. Grebenschikov, vo...@express.ru
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