Hello,
I have recently acquired some second hand SAS Disks, Seagate 4 TB ST4000NM0023, I have 8 of them.
To start with, I connected 4 of them to an LSI 9270-8i controller and created a RAID5 virtual drive.
During my first tests, the read and write speeds were really good (400+ MB/s read and 350+ MB/s write).
I then started copying several TB of data and after a couple of hours the write speed dropped severely and stayed around 95 MB/s.
The difference I noticed is that, in the task manager, the virtual disk was first busy at round 85% and now that the speed has dropped down it is permanently at 100%.
I am suspecting that one of the disk is slower than the other ones and is slowing down the whole array but I have quickly tested them one by one before creating the array and their individual speeds were in line with the specs (175 MB/s write).
Any ideas?
Thanks.
John
I have recently acquired some second hand SAS Disks, Seagate 4 TB ST4000NM0023, I have 8 of them.
To start with, I connected 4 of them to an LSI 9270-8i controller and created a RAID5 virtual drive.
During my first tests, the read and write speeds were really good (400+ MB/s read and 350+ MB/s write).
I then started copying several TB of data and after a couple of hours the write speed dropped severely and stayed around 95 MB/s.
The difference I noticed is that, in the task manager, the virtual disk was first busy at round 85% and now that the speed has dropped down it is permanently at 100%.
I am suspecting that one of the disk is slower than the other ones and is slowing down the whole array but I have quickly tested them one by one before creating the array and their individual speeds were in line with the specs (175 MB/s write).
Any ideas?
Thanks.
John