Messages in this thread | | | Subject | Re: [dm-devel] Re: [RFD] BIO_RW_BARRIER - what it means for devices, filesystems, and dm/md. | From | Valdis.Kletnieks@vt ... | Date | Tue, 10 Jul 2007 19:40:00 -0400 |
| |
On Tue, 10 Jul 2007 14:39:41 EDT, Ric Wheeler said:
> All of the high end arrays have non-volatile cache (read, on power loss, it is a > promise that it will get all of your data out to permanent storage). You don't > need to ask this kind of array to drain the cache. In fact, it might just ignore > you if you send it that kind of request ;-)
OK, I'll bite - how does the kernel know whether the other end of that fiberchannel cable is attached to a DMX-3 or to some no-name product that may not have the same assurances? Is there a "I'm a high-end array" bit in the sense data that I'm unaware of?
[unhandled content-type:application/pgp-signature] | |