Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi Lars, I completely understand, sorry for the missunderstanding. I obviously thought your comment 'it lies to the kernel about having written stuff to disk' meant that it confuses DRBD. Thanks for the clarification. In which case my problem of DRBD locking is still outstanding. Although Jure Pečar just emailed me to say he have found a problem with the latest bnx2 driver: "Turns out I can also reproduce the problem with 1.6.7b driver. Now I'm in direct contact with Michael Chan, author of bnx2 driver. Let's see what he has to tell about this." This may be the problem that so many users of this Broadcom network card are experiencing. In which case we can all hope a solution is on the way... Regards, Ben Lars Ellenberg wrote: > On Mon, Jan 07, 2008 at 08:56:56AM +0000, Ben Clewett wrote: >> >> Hi Carson, >> >> Thanks for your reply. It is certainly odd that a write-ahead-cache >> should make DRBD slower rather than faster. > > you definetely misunderstood something here. > >> The comments I picked up were from Lars Ellenberg: >> >> http://thread.gmane.org/gmane.linux.network.drbd/11397/focus=11401 >> >> "no. more concern about your write cache in the cciss controller, >> and whether it lies to the kernel about having written stuff to disk >> when in fact it is only in that (probably not battery backed?) write >> cache..." > > my concerns here are about data reliability, > and have nothing to do with anything "locking" or not. > > this comment was meant to say: > if you use write-back (aka write-behin, aka write-ahead) caches, > then they better be persistent (aka "battery backed"). > > nothing more, nothing less. > > ************************************************************************* This e-mail is confidential and may be legally privileged. It is intended solely for the use of the individual(s) to whom it is addressed. Any content in this message is not necessarily a view or statement from Road Tech Computer Systems Limited but is that of the individual sender. If you are not the intended recipient, be advised that you have received this e-mail in error and that any use, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. We use reasonable endeavours to virus scan all e-mails leaving the company but no warranty is given that this e-mail and any attachments are virus free. You should undertake your own virus checking. The right to monitor e-mail communications through our networks is reserved by us Road Tech Computer Systems Ltd. Shenley Hall, Rectory Lane, Shenley, Radlett, Hertfordshire, WD7 9AN. - VAT Registration No GB 449 3582 17 Registered in England No: 02017435, Registered Address: Charter Court, Midland Road, Hemel Hempstead, Hertfordshire, HP2 5GE. *************************************************************************