On Wednesday 05 June 2013, Carlos E. R. wrote:
On 2013-06-05 11:39, Ruediger Meier wrote:
Hi,
I have a raid1 with 2 HDs. Is it possible somehow to let him use only one of them for reading?
It should run faster reading from two, because it can read two blocks simultaneously.
I'd benchmarked it and it's not faster for me. The advantage is that in case of inconsistencies you will get always the same data from one particular mirror. Generally using both could be even slower if you have one fast and one slow HD. Anyway in my case I've noticed raid inconsistencies (without seeing any other problem) and I wanted to make two backups (one per mirror) without taking the raid offline. Now I have such backups and I can diff and infestivate them further. $ md5sum /backup/kvm.0/* 03fb631ab6810e28bc23a4b700b36598 vm02_root_sda 51519c14d5dfed591fa5cd9dd4789b2f vm02_root_sdb 620e31b4bbf852e41413565f834a9a74 vm05_root_sda cd45de09ca60a2c058bb3a6fdc8cf5cc vm05_root_sdb 2592485256d561b2274b9525d63bbcb7 vm06_root_sda 5e5e04cbe82fb1971e8baa54c3485fe2 vm06_root_sdb 53f2dfdff8af2492006a97cbfeb1fc44 vm09_root_sda 53f2dfdff8af2492006a97cbfeb1fc44 vm09_root_sdb Without using "writemostly" I always got a non-deterministic random mix of both mirrors. cu, Rudi -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org