On 01/07/2010 05:28 PM, Joseph L. Casale wrote:
An often overlooked issue is the rebuild time with Linux software raid and all hw raid controllers I have seen. On large drives the times are so long as a result of the sheer size, if the array is degraded you are exposed during the rebuild.
As a point of reference: On a SIL3512 SATA interface, mdraid raid1, 2 x 1 TB disks take just under 6 hrs to resync with moderate load ( this machine is a mailserver off a 5mbps link to the internet, and rarely hits > 0.3 load with just usage.
same machine with zero load and the mdadm resync rate bumped to 800000K/sec, it takes just over 3 hrs 42 min. But dont expect to be able to do anything with the machine during this time.
( I've just done these two syncs today! )
Disks are all : SAMSUNG HD103UJ , and are at 83% data space used of total capacity.
- KB