[DRBD-user] Slow syncall after kernel+drbd upgrade

Christian Hammers ch at westend.com
Thu Jan 22 00:55:04 CET 2004

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


Hello

On Wed, Jan 21, 2004 at 01:34:31PM +0100, Lars Ellenberg wrote:
> > Hm, as I have to reboot the machines anyway due to a problem 
> > with a NIC (which is not involved in DRBD), I will probably rather
> > downgrade to 0.6.4 and see what happens there.
> 
> yes, you are right, this would be nice to know. though I doubt
> that it makes a difference.
> anyways, "never change more than one thing at a time" :)

The third night spending my time with this !"§% system... 

First, I switched back to 0.6.4 but the syncall speed stayed slow
so I disconnected the server and rebootet 0.6.10 again.

Then I commented out the ts-size=5000 parameter to reset it to the 
default of 256. Didn't gained me much, the speed even dropped to
about 1100 KB/s :-(

So the only things that could have an influence and were not yet tried
are:
 - Kernel change from 2.4.23 to 2.4.24 due to the security issue
 - New CPU+Mainboards (Intel P4 & AMD-Athlon, both about 2,6GHz)
 - New internal NICs, both Intel Gigabit with e1000.o driver

As somebody asked me for it I have the iostat and vmstat lines of both
systems here:

[the primary]

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
dev8-0           58.00      6840.00         8.00       6840          8

   procs                      memory    swap          io     system cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us sy  id
...
 0  4  7      0 592748  62792 177188   0   0  3780   188  762   935   0 2  98
 

[the secondary]

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
dev8-0          336.00         0.00      6496.00          0       6496

   procs                      memory    swap          io     system cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us sy  id
...
 0  0  0      0 983316   4876  18260   0   0     0  3668  929  1332   0 5  95


> > > > 0: cs:SyncingAll st:Secondary/Primary ns:0 nr:1435652 dw:1435652 dr:0 pe:0 ua:15
> > > >         [=====>..............] sync'ed: 26.8% (3668/5004)M
> > > >         finish: 0:47:57h speed: 1,319 (1,313) K/sec
> > > > 1: cs:SyncingAll st:Secondary/Primary ns:0 nr:1367248 dw:1367248 dr:0 pe:0 ua:15
> > > >         [=====>..............] sync'ed: 26.7% (3672/5004)M
> > > >         finish: 0:47:40h speed: 1,336 (1,310) K/sec

bye & thanks for any help,

-christian-

P.S.: Changing the nicelevel below zero is not a good idea as the system
      becomes quite laggy without any visible speed gain.
-- 
Christian Hammers             WESTEND GmbH  |  Internet-Business-Provider
Technik                       CISCO Systems Partner - Authorized Reseller
                              Lütticher Straße 10      Tel 0241/701333-11
ch at westend.com                D-52064 Aachen              Fax 0241/911879




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