Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Thanks Lars, please see comments below. 2009/3/13 Lars Ellenberg <lars.ellenberg at linbit.com> > On Fri, Mar 13, 2009 at 11:01:05AM +0000, Maros Timko wrote: > > Hi all, > > > > I wonder why user documentation states how to estimate required DRBD > > metadata size for external metadata: > > > http://www.drbd.org/users-guide-emb/ch-internals.html#s-external-meta-data > > when it is quite hardcoded value. At least example drbd.conf file still > > includes this information (128MB for each DRBD resource). > > there is meta-disk, and there is flexible-meta-disk. > > man drbd.conf Wow, I thought flexible-meta-disk can be used for internal metadata only. I think I saw it somewhere in my first contact with DRBD. Fine, now I checked man drbd.conf and it in place since 8.2.6 so Mea Culpa. I should not simply lean on template drbd.conf > > > So did ahything chance with DRBD 8.3.0 regarding external metadata size > > requirements? > > with drbd 8.3, you can use up to 16 TiB storage (well, you should not > have that exact amount, rather some sectors less). > > that would need 512 MiB worth of bitmap, plus the usual few KiB > for "superblock" and activity log. > But then it is quite interesting. If I am using meta-disk I cannot attach device that is larger then 4TB and if I want to, I simply have to use flexible-meta-disk. I think I have a deja-vu from last December, there was a messages exchange regarding mounting of 16TB devices. What if I am using single LVM for multiple flexible-meta-disk devices (flexible-meta-disk /dev/sda6[0...]) and later on I decide to resize/extend the corresponding DRBD partitions - will this be handled by DRBD correctly without any user intervention? Or -- from performance point of view -- would it be prefarable to dump/import all the metadata blocks after such change? > > -- > : Lars Ellenberg > : LINBIT | Your Way to High Availability > : DRBD/HA support and consulting http://www.linbit.com > > DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. > __ > please don't Cc me, but send to list -- I'm subscribed > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20090313/eaa54690/attachment.htm>