Software RAID 10. Servers are HP DL380 Gen 8s, with 12x4 TB 7200 RPM drives. On 2016-06-01, 3:52 PM, "centos-bounces@xxxxxxxxxx on behalf of m.roth@xxxxxxxxx" <centos-bounces@xxxxxxxxxx on behalf of m.roth@xxxxxxxxx> wrote: >Kelly Lesperance wrote: >> I did some additional testing - I stopped Kafka on the host, and kicked >> off a disk check, and it ran at the expected speed overnight. I started >> kafka this morning, and the raid check's speed immediately dropped down to >> ~2000K/Sec. >> >> I then enabled the write-back cache on the drives (hdparm -W1 /dev/sd*). >> The raid check is now running between 100000K/Sec and 200000K/Sec, and has >> been for several hours (it fluctuates, but seems to stay within that >> range). Write-back cache is NOT enabled for the drives on the hosts we >> haven't upgraded yet, but the speeds are similar (I kicked off a raid >> check on one of our CentOS 6 hosts as well, the window seems to be 150000 >> - 200000K/Sec on that host). ><snip> >Perhaps I missed where you answered this: is this software RAID, or >hardware? And I think you said you're upgrading existing boxes? > > mark > >_______________________________________________ >CentOS mailing list >CentOS@xxxxxxxxxx >https://lists.centos.org/mailman/listinfo/centos _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx https://lists.centos.org/mailman/listinfo/centos