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----------------------------- > > Szilveszter a Balatonon - 79.000 Ft / fő / 3 éjtől > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user