Re: [Scst-devel] Integration of SCST in the mainstream Linux kernel

Matteo Tescione
2008-02-05T17:11:37Z

On 5-02-2008 14:38, "FUJITA Tomonori" <tomof@acm.org> wrote:

> On Tue, 05 Feb 2008 08:14:01 +0100
> Tomasz Chmielewski <mangoo@wpkg.org> wrote:
>
>> James Bottomley schrieb:
>>
>>> These are both features being independently worked on, are they not?
>>> Even if they weren't, the combination of the size of SCST in kernel plus
>>> the problem of having to find a migration path for the current STGT
>>> users still looks to me to involve the greater amount of work.
>>
>> I don't want to be mean, but does anyone actually use STGT in
>> production? Seriously?
>>
>> In the latest development version of STGT, it's only possible to stop
>> the tgtd target daemon using KILL / 9 signal - which also means all
>> iSCSI initiator connections are corrupted when tgtd target daemon is
>> started again (kernel upgrade, target daemon upgrade, server reboot etc.).
>
> I don't know what "iSCSI initiator connections are corrupted"
> mean. But if you reboot a server, how can an iSCSI target
> implementation keep iSCSI tcp connections?
>
>
>> Imagine you have to reboot all your NFS clients when you reboot your NFS
>> server. Not only that - your data is probably corrupted, or at least the
>> filesystem deserves checking...

Don't know if matters, but in my setup (iscsi on top of drbd+heartbeat)
rebooting the primary server doesn't affect my iscsi traffic, SCST correctly
manages stop/crash, by sending unit attention to clients on reconnect.
Drbd+heartbeat correctly manages those things too.
Still from an end-user POV, i was able to reboot/survive a crash only with
SCST, IETD still has reconnect problems and STGT are even worst.

Regards,
--matteo