[DRBD-user] Mysql on DRBD: Cache Problem?

Lee Christie Lee at titaninternet.co.uk
Fri Aug 1 15:33:07 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Most hard drives ship with write-cache enabled.
When using decent raid controllers its best to turn off the write(back) cache on hard drives. In our testing it makes no difference anyway with a good card.
Its possible your lost data was in hard drive cache.


	From: drbd-user-bounces at lists.linbit.com [mailto:drbd-user-bounces at lists.linbit.com] On Behalf Of Mark Eisenblaetter
	Sent: 01 August 2008 14:22
	To: drbd-user at lists.linbit.com
	Subject: [DRBD-user] Mysql on DRBD: Cache Problem?
	Hi List,
	I'm trying to run a DRBDMySQL Cluster (Active/Passive) with Replication for easier backup.
	My problem ist that after a hardkill from the master(Powerkill) the slave misses binlog positions.
	After disable the Arraycontroller Write cache its reduced from 100k to 16k Position but that not enough.
	I run DRBD with Protocal C and the minimal max-buffer of 32k.
	Is there any cache i miss? Or somthing else?
	setup: 2x HP DL360G5 whit raid 10 and Gigabit network for drbdsync only.  
	Mark Eisenblätter
	Geissendoerfer & Leschinsky GmbH


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