[DRBD-user] primary/primary via lvm on xen (centos 5) and drbd 8.4 - performance tuning

2011-09-25 Thread Jakob Praher
Dear list, When looking into performance tuning DRBD, I found the max-bio-bvecs settings as a performance factor. I set it to 1 due to the comment below (which is slow). Is this problem still the case (we are using DRBD version 8.4.0-1)? Can one enforce the alignment settings for ext3/ext4? #

Re: [DRBD-user] Diskless does not go to secondary

2011-09-25 Thread David Coulson
On 9/25/11 1:57 AM, Christian Völker wrote: I wanted to make the secondary now the new primary with "drbdadm primary drbd0" but it refused to do so because the primary was still reachable by ping and network as well drbd service was running. Did you 'drbdadm secondary drbd0' on the primary firs

Re: [DRBD-user] Diskless does not go to secondary

2011-09-25 Thread Christian Völker
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi David, >> I wanted to make the secondary now the new primary with "drbdadm >> primary drbd0" but it refused to do so because the primary was >> still reachable by ping and network as well drbd service was >> running. > Did you 'drbdadm secondary d

Re: [DRBD-user] Diskless does not go to secondary

2011-09-25 Thread David Coulson
On 9/25/11 8:13 AM, Christian Völker wrote: I have to manually set my primary to act as secondary even though it seems to be obvious because he has lost his disk? That's strange It can still fulfill it's IO requests by sending them over the wire. I'm not sure if you use Pacemaker's DRBD scri

Re: [DRBD-user] Diskless does not go to secondary

2011-09-25 Thread Florian Haas
On 2011-09-25 14:13, Christian Völker wrote: > Hi David, > >>> I wanted to make the secondary now the new primary with "drbdadm >>> primary drbd0" but it refused to do so because the primary was >>> still reachable by ping and network as well drbd service was >>> running. >> Did you 'drbdadm seco

[DRBD-user] Errata in section "17.1.3. Estimating meta data size" ?

2011-09-25 Thread Gilbert Standen
Hi, I'm calculating external meta data size for a resource of size 976773168 total sectors. ### Using the "first" formula (the "exact" formula, not the approximation) gives: [ (976773168/262144) x 8 ] + 72 = 29880.751464844 (sectors) where 262144 = 2^18 (2 raised to the 18th power) and