[DRBD-user] Sudden system load [SOLVED!]

Pascal BERTON pascal.berton3 at free.fr
Mon Jun 20 23:03:50 CEST 2011

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

Hi Richard!

Glad to read that! Wow, I would never had thought about that, so I write it
somewhere in my head, very good to know! And it makes so much sense by the
way... Thanks for sharing this.

Best regards,


-----Message d'origine-----
De : drbd-user-bounces at lists.linbit.com
[mailto:drbd-user-bounces at lists.linbit.com] De la part de Richard Stockton
Envoyé : lundi 20 juin 2011 21:45
À : drbd-user at lists.linbit.com
Objet : Re: [DRBD-user] Sudden system load [SOLVED!]

Our problem was a sudden system load that bogged down our DRBD servers
for 13-14 hours daily.  The problem turned out to be in the batteries
on the RAID controllers.  When the batteries are low and unable to fully
charge, they force the RAID system into write-through mode instead of
write-back mode while they attempt to re-charge/adjust.  This slowed
down everything and caused our mysterious increased system load.

Once we replaced the batteries, system load returned to normal.

We still have one drive doing 10 times the writes as the other, but
performance is no longer affected, so finding the cause of that
problem is no longer as critical (but we continue to investigate).

I would like to thank those on the list who tried to help, we really
do appreciate the effort.
Thanks again.
  - Richard

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