[sheepdog] Multi-attach + Checksums

Hitoshi Mitake mitake.hitoshi at gmail.com
Wed Apr 6 04:34:03 CEST 2016

Hi Aaron,

On Wed, Apr 6, 2016 at 12:50 AM, Aaron Knister <aaron.s.knister at nasa.gov>

> Hi Everyone,
> I'm looking at sheepdog for a project I'm working on, and have a couple
> questions:
> 1. Is it safe to attach a vdi to multiple sbd/tgtd/qemu instances at the
> same time? It certainly seems to work, but I'm curious to know if this is a
> use case that's tested for or if I'm likely to encounter issues doing this.

Only tgt (iSCSI) support this for multipath purpose. Other interfaces don't
support it.

> 2. Does sheepdog checksum the objects and verify the checksums on reads?
> e.g. to protect against a disk drive flaking out doing something stupid
> since there won't be any RAID controllers involved here.

Currently this kind of validation isn't supported. Because overhead
(updating checksum on write, validating on read) will be heavy. Do you want
it? Supporting it as an option will be reasonable.


> Thanks!
> -Aaron
> --
> Aaron Knister
> NASA Center for Climate Simulation (Code 606.2)
> Goddard Space Flight Center
> (301) 286-2776
> --
> sheepdog mailing list
> sheepdog at lists.wpkg.org
> https://lists.wpkg.org/mailman/listinfo/sheepdog
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