[DRBD-user] Upgrade from 0.7 - questions - corrected version

X LAci lanlaf at index.hu
Fri Dec 26 15:25:57 CET 2008

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


The first version missed formatting in some of the archives,
I don't know if it was the fault of windows, or webmail.

On Fri, 2008-12-26 at 12:43 +0100, LAci X wrote:
>  Hi,
> 
> I have a Heartbeat + DRBD 0.7.x based production system up
> and running for a year now (7x24, rebooted only for security
> upgrades).
> It is based on Debian Etch, two IBM X3500 servers, each 
> loaded with 750 GByte SATA disks, HW RAID5, 5.5 TByte cut
> into several ~680 GByte pieces.
> On top of DRBD there is iscsi-target serving a Windows 2003 
> cluster with various applications.
> 
> The system is stable, no crashes, no problems whatsoever.
> 
> I do have a performance problem though. I have to use blockio 
> in iscsi-target (no linux page-cache), because fileio 
> resulted in data loss in case of hard crash of the primary.
> 
> On the iscsi interface the max throughput measured by mrtg
> is like 15 megabytes/sec on a 5 minute average.
> 
> If I watch on the windows side, the traffic of the iscsi 
> interface shoots up to 40-60 % of gigabit, then falls 
> back to 0-10 %, then shoots up again, and so on,
> so it fluctuates.
> I think it is a latency issue, the microsoft iscsi initiator
> sends some requests (with various amount of data), and until
> those does not come back as completed, it doesn't send more
> requests.
> 
> During the test phase of the system, if I skipped DRBD, and
> put iscsi-target write directly to the raid-disk, the 
> performance was up and the iscsi interface load draw a 
> horizontal line, no fluctuations as with drbd.
> 
> I am thinking about upgrading to drbd 8.
> 
> The reason for upgrade:
> 
> - company policy does not allow usage of unsupported software,
>  and drbd 0.7 is not supported any more.
> - the above mentioned performance problem.
> 
> The questions:
> 
> - Which version I should upgrade to, 8.0.14 or 8.3.0?
> 
> I am thinking about going to 8.3.0, as it has certain latency
> improvements not available in 8.0.x (if that is correct).
> 
> - Is 8.3.0 (and 8.0.14) is as stable as the 0.7 codebase, which
> is running in production for a year now without problems?
> 
> - Does anyone use 8.2.x or 8.3.0 in production?
> - Which kernel is better for drbd 8, Debian 2.6.18 or Debian 2.6.24
>   etchnhalf?
> 
> Best regards,
> lanlaf
> 
> 
> --------------------------Hirdetés----------------------------- 
> 
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> 
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