Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
>> there is a certain risk of data not reaching the hard disk soundly. >It seems so but what is a way to catch the reason? If you use LVM, did you set the correct filter in lvm.conf? Edit /etc/lvm/lvm.conf And allow only “drbd” devices to be used for LVM filter = [ "a|drbd|", "r|.*|" ] Turn off LVM cache write_cache_state = 0 Do you use some custom disk caching module like flashcache? I have had data integrity issues when I used flashcache with drbd. >> - not use dual-primary >I can't because I need online migration (I know it's dangerous to do migration now, because data can be not synced properly) To avoid the dual primary mode I have put all storage on an a HA iSCSI SAN, then drbd can be used in primary/secondary mode. If you want I can send you my setup notes using centos 6.4 drbd, tgt and pacemaker. Best regards, Maurits van de Lande Van: drbd-user-bounces at lists.linbit.com<mailto:drbd-user-bounces at lists.linbit.com> [mailto:drbd-user-bounces at lists.linbit.com] Namens Stanislav German-Evtushenko Verzonden: maandag 25 maart 2013 10:43 Aan: Felix Frank CC: drbd-user at lists.linbit.com<mailto:drbd-user at lists.linbit.com> Onderwerp: Re: [DRBD-user] Uncatchable DRBD out-of-sync issue Hi, > there is a certain risk of data not reaching the hard disk soundly. It seems so but what is a way to catch the reason? > What's your hard disk stack? RAID 1+0 on both nodes. > If you have the freedom, there are some things to try, e.g. > - not use ethernet bonding I can try but it will decrease bandwidth from 200MiB/s to 100MiB/s and disable redundancy. > - not use dual-primary I can't because I need online migration (I know it's dangerous to do migration now, because data can be not synced properly) > - use a smaller partition Why? Best regards, Stanislav -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20130325/2aea3b40/attachment.htm>