Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Thursday 14 August 2008 23:04:47 Wolfram Schlich wrote: > Hi, > > imagine the following setup: > - 2 node cluster > - 2x Dell PowerEdge 860, Dual Core Xeon 2.13GHz, > 4GB RAM, SATA HW RAID1 (write cache enabled, > NCQ enabled), 1GE link for internal cluster > communication (DRBD, Heartbeat etc.), Heartbeat > fencing using IPMI-over-LAN > - Linux 2.6.25 x86_64 with deadline or CFQ scheduler > (tried both) > - DRBD 8.2.6 > - Heartbeat 2.1.3 with dopd enabled > - drbd.conf: see http://paste.frubar.net/8786 > - MySQL-5.0.60 with sync-binlog=1 and > innodb_flush_log_at_trx_commit=1 > > With the DRBD instances connected, the system > spends >30% on iowait and is >30% idle > during a load test. > > With the secondary instance disconnected, the system > does (almost) not spend any time on iowait, CPU > usage is at around 80% user and 20% system, but > the load goes slowly up to more than 20 after a > minute or so... > > What could be the reason for both issues (iowait > vs. load skyrocketing)? > > Thanks! If its like other Dell's, you should start by disabling the TCP Offload (TOE) by removing the hardware key on the motherboard. Mark. -- Mark Watts BSc RHCE MBCS Senior Systems Engineer QinetiQ Applied Technologies GPG Key: http://www.linux-corner.info/mwatts.gpg -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 197 bytes Desc: This is a digitally signed message part. URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20080815/27d986ad/attachment.pgp>