Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
hello, in "Re: [DRBD-user] deadlock? NFS export DRBD on loop device on tmpfs" <yf11x58lf1l.wl%hirose31 at t3.rim.or.jp> at Fri, 05 Aug 2005 21:54:46 +0900, hirose31 at t3.rim.or.jp wrote: > Additionaly question and ask advice. > > 1 Why DRBD deadlock on loopback device? Does fsync() cause deadlock? > > 2 Is there any idea that DRBD on huge (1G-12GB) memory base device? > > NG tmpfs - tmpfs is not block device. > NG ramfs - ramfs is not block device. > NG ramdisk - too small. (up to 512MB x 16 devices?) > > NG loseup + tmpfs - cause deadlock. > NG loseup + ramfs - cause deadlock. I tried following. > ?? LVM + many ramdisk - create big block device with join many > ramdisk(/dev/ramX). NG: cannot pvcreate /dev/ramX. # pvcreate -vd /dev/ram2 Device /dev/ram2 not found. > ?? MD + many ramdisk - ditto. NG: System down when write big data to /dev/md0. boot with ramdisk_size=524288. mdadm -C /dev/md0 -l0 -n2 /dev/ram2 /dev/ram3 mdadm -D /dev/md0 (seems to be 512MB+512MB=1GB RAID0 device.) mkfs.xfs -f -s size=1024 -b size=1024 -i size=512,maxpct=0 /dev/md0 mount /dev/md0 /mnt/md0 (mount device successfully) dd if=/dev/zero of=/mnt/md0 bs=1M couint=700 (no problem) dd if=/dev/zero of=/mnt/md0 bs=1M couint=1500 (system go down...) > ?? other idea?? maybe OK: DRBD on /dev/ram1 (512MB) I has done stress-test (repeat dd and bonnie++) over night. It seems good. Is there a possibility of serious problem on DRBD on /dev/ramX? > in "Re: [DRBD-user] deadlock? NFS export DRBD on loop device on tmpfs" > <20050804053619.GA13037 at barkeeper1.linbit> > at Thu, 4 Aug 2005 07:36:19 +0200, > Lars.Ellenberg at linbit.com wrote: > > > > I want memory storage NFS server, so using NFS server that export XFS > > > on DRBD on loop device on tmpfs. > > > > > > This system looks like working well, but sometimes load average > > > increase too high (up to 20) suddenly and system is hung up. > > > > > > [question] > > > 1 Someone (on Internet) say that DRBD on loop device cause > > > deadlock. Is it true? > > > > yes. > > > > > > > > 2 What mean "top of loop device" on DRBD wiki page? loop block device? > > > or network loop device? > > > DataRedundancyByDrbd / Some Do's and Don'ts > > > <URL:http://wiki.linux-ha.org/DataRedundancyByDrbd#head-25da1eb596fac86b9b39073f3a9566007cc6a505> > > > > from the context, it should be clear that loop block dev is meant. > > > > > 3 Does DRBD work well on loop device on tmpfs? > > > > no > > > > > Is there a possibility of deadlock or serious problem? > > > > yes -- HIROSE, Masaaki