Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
How do you serialize the resync? I don't see the "group" option any more, which is what I used to control priority and speed of the resync. I'm on 8.3.0 now, and when I fire up a node that was down, _all_ devices start syncing, which only makes it take longer due to the underlying disk thrashing (is my guess). --Sam On Fri, Jan 23, 2009 at 10:44 AM, Lars Ellenberg <lars.ellenberg at linbit.com>wrote: > On Fri, Jan 23, 2009 at 05:59:47PM +0100, Bruno Voigt wrote: > > Hi, > > > > I'm looking for some figures: > > > > What are the memory requirements/guidelines for DRBD resources? > > What are the maxima for normal operation, sync, verify ? > > Is it dependent on the size of the replicated device? > > Does the requirements increase lineary with each resource ? > > > > I'm playing with a Debian lenny/unstable system pair (HP DL360 G5, 8G > RAM) > > with linux 22.214.171.124 (or 126.96.36.199), xen 3.2.1, DRBD 8.3.0, > > hosting 13 DomU - each with 2 DRBD-Devices (4G disk+512M swap) > > allocated from LVM LVs each separately replicated with DRBD. > > > > The Dom0 got a fixed amount of memory (1 G via grub menu.list > > xenhopt=dom0_mem=1024M) > > and I've seen the situation that the Out-of-memory killer strikes on the > > node A > > if all DRBD resources are synced (all at once) from node A to initially > > connected node B. > > > > Nothing else besides an small apache is running on the Dom0, > > in disconnected mode there is over 600M available on node a. > > > > If I sync the resources one by one the OOM can be prevented. > > > > So I'm looking for a solid based way to size the RAM of the Dom0 .. > > From: Lars Ellenberg > Subject: Re: Summarizing DRBD memory usage > Date: 2008-07-24 10:43:52 GMT > http://thread.gmane.org/gmane.linux.network.drbd/15482/focus=15485 > > so in your situation, > right, serialize the resync (probably a good idea anyways). > and/or maybe decrease "max-buffers", which limits the number of > in-flight pages. > > or give it plenty of ram. > > -- > : Lars Ellenberg > : LINBIT | Your Way to High Availability > : DRBD/HA support and consulting http://www.linbit.com > > DRBD(R) and LINBIT(R) 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/20090123/4a99d7b6/attachment.htm>