Am 16.10.18 um 12:46 schrieb Shaun Glass: > We have some servers that that we have setup RAID 1 with mdadm. The > layout is having one disk in one VMWare Datastore and the other in > another VMWare Datastore. These are RHEL 7 Servers. LVM With EXT4 > Filesystems. > > Now they seem to function perfectly well without too much performance > impact until we run backups in the evening. Here we see backups > basically taking 5 times as long to complete as they normally would. > We use TSM for backups and it is typically flat file backups. > > Please note these Datastores are in different DC's with a big network > link between. Since performance during the day is perfectly fine, we > are a bit lost as to why backups are taking so long. > > Any suggestions? because backups produce a lot of load and a simple RAID1 mirror with rotating disk by definition is not a fast storage with RAID10 write performance is doubled and in the best case large reads are splitted over all 4 disks
