[stgt] Write-cache in tgtd during a target-host crash

[FUJITA Tomonori]

On Wed, 21 Apr 2010 19:51:49 +1000
ronnie sahlberg <ronniesahlberg at gmail.com> wrote:

> I think that when you change the mode page like this,  it does not
> change the behaviour of tgtd but only of what
> tgtd will respond when a initiator does a mode sense for that page.

Actually, it does. tgt follows the mode page settings properly.

With the default mode page settings, you get the following on the
initiator box:

clover:/home/fujita# sdparm --get=WCE /dev/sda
    /dev/sda: IET       VIRTUAL-DISK  0001
WCE         1  [cha: y, def:  1]


With Chris's settings, you get the following on the initiator box:

clover:/home/fujita# sdparm --get=WCE /dev/sda
    /dev/sda: IET       VIRTUAL-DISK  0001
WCE         0  [cha: n, def:  0]


Of course, if you don't like the default settings, you can do on the
initiator box:

clover:/home/fujita# sdparm --clear=WCE /dev/sda
    /dev/sda: IET       VIRTUAL-DISK  0001
clover:/home/fujita# sdparm --get=WCE /dev/sda
    /dev/sda: IET       VIRTUAL-DISK  0001
WCE         0  [cha: y, def:  0]
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