Hello Roman, Saturday, October 24, 2015, 6:31:39 PM, you wrote: > Use a higher bitmap-chunk size, such as 256M or more. I guess that would be mdadm --grow /dev/md0 --bitmap-chunk=256M ?? is it wise to issue this command during a re-sync? a cron.weekly job started the re-sync (although I'm pretty sure this job has been disabled quite some time ago) $ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid5 sdb1[7] sdf1[3] sdc1[5] sde1[0] sdd1[8] 11721061376 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU] [==>..................] resync = 11.9% (348948608/2930265344) finish=7771.1min speed=5533K/sec bitmap: 8/350 pages [32KB], 4096KB chunk unused devices: <none> tnx & cu -- Best regards, Rainer mailto:rfu@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html