> From: Guoqing Jiang <guoqing.jiang@xxxxxxxxxxxxxxx> >>On 12/7/19 11:44 PM, John Stoffel wrote: >> As Daniel says, he's got lots of disk load, but plenty of CPU, so the >> single thread for RAID5 is a big bottleneck. >Perhaps set "/sys/block/mdx/md/group_thread_cnt" could help here, Now I finally had a chance to test this. It turns out to work great! It's not as fast as a non-raided linearly allocated LVM volume (about half of performance without getting a fat tail of high read/write response time). So there is a price for redundancy but that is worth it in my application. It's now up there in the same magnitude. Thanks a lot Guoqing! You really helped me a lot here. I'd also like to thank John Stoffel for valuable input. _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
