Re: Integration of SCST in the mainstream Linux kernel

Jeff Garzik
2008-02-05T18:08:56Z

Olivier Galibert wrote:
> On Mon, Feb 04, 2008 at 05:57:47PM -0500, Jeff Garzik wrote:
>> iSCSI and NBD were passe ideas at birth. :)
>>
>> Networked block devices are attractive because the concepts and
>> implementation are more simple than networked filesystems... but usually
>> you want to run some sort of filesystem on top. At that point you might
>> as well run NFS or [gfs|ocfs|flavor-of-the-week], and ditch your
>> networked block device (and associated complexity).
>
> Call me a sysadmin, but I find easier to plug in and keep in place an
> ethernet cable than these parallel scsi cables from hell. Every
> server has at least two ethernet ports by default, with rarely any
> surprises at the kernel level. Adding ethernet cards is inexpensive,
> and you pretty much never hear of compatibility problems between
> cards.
>
> So ethernet as a connection medium is really nice compared to scsi.
> Too bad iscsi is demented and ATAoE/NBD inexistant. Maybe external
> SAS will be nice, but I don't see it getting to the level of
> universality of ethernet any time soon. And it won't get the same
> amount of user-level compatibility testing in any case.

Indeed, at the end of the day iSCSI is a bloated cabling standard. :)

It has its uses, but I don't see it as ever coming close to replacing
direct-to-network (perhaps backed with local cachefs) filesystems...
which is how all the hype comes across to me.

Cheap "Lintel" boxes everybody is familiar with _are_ the storage
appliances. Until mass-produced ATA and SCSI devices start shipping
with ethernet connectors, anyway.

Jeff