Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Florian, Glad to supply as much information as you ask for. First a discovery. I was clearing the array by issuing on the primary: # drbdadm disconnect all # debdadm connect all Which I found didn't work. However if I do this on *both* primary and secondary, so that I disconnect both and then connect both, I do clear my bad blocks. Other answers in line: Florian Haas wrote: > Ben, > > On Thursday 06 March 2008 18:17:42 Ben Clewett wrote: >> Dear DRBD, >> >> I am continuing to try and work out the verify on 8.2.5 from the manual: >> >> http://www.drbd.org/users-guide/s-use-online-verify.html >> >> The verify works and finds bad blocks. However I can't seem to clear >> them using the suggested method of disconnect and connect. Further >> verify commands seem to add bad blocks (on my set-up), which I could >> only clear with a full invalidation. >> >> I also did a check on all three suggested hashing algorithms, and found >> they all showed the same load and time to complete. Which was also >> exactly the same load and time as a full invalidate. >> >> So I am not sure what the advantage of the verify is. > > The obvious advantage of online verify vs. "bulldozer-style" full resync is > this: While you are doing a full resync, since your Secondary is > inconsistent, you are not redundant. In other words if your Primary crashes > during the resync, you're in trouble... or at least forced to bust out your > tapes. While you are doing an online verify run, you are fully redundant the > whole time. I understand. >> With the current >> version on 8.2.5, it seems to promote the creation of bad blocks, does >> not allow them to clear, and have the same time and loading as a full >> resync. >> >> I'm hoping you can tell me that I am doing something completely wrong. > > Nothing that occurs to me at first glance. But I have a few questions for you: > > - Can you confirm the behavior you described with protocol C, too? Or is this > only reproducible with protocol B? I will check over the course of today and let you know. > - What is your particular reason for specifying the device size explicitly and > does the issue also appear when you don't? The physical partition size is slightly different on both sides. To avoid any problem I manually set the size at a few meg below the smallest size. I can't change this on the hardware I have avaiable for testing very easily. Unless DRBD is completelly safe when it finds different sized partitions??? > - What specific make and model of SmartArray controller are you using, and > what is the firmware version and cciss driver version? Both sides enjoy the same smart array which is up to latest firmware revision: Smart Array P400 Firmweare 4.12 with RAID 5 over seven 136 GB SATA drives. No problem, only trying to be helpful... Ben > > Cheers, > Florian > ************************************************************************* 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. *************************************************************************