Good day,
so finally, I got my SAS controller and cables and finally I can test a couple disks I got.
So I have bought a couple used SAS SSDs cheaply. For example I got HGST S842 and some HUSSL4040. Very nice SSDs. I also have some HGST Ultrastar 14 TB hard disks. They will be handy when I will make my media zpool. I also got them used for very small $.
So I connected the drives and checked the SMART status. I already learned that SAS SMART is something completely different than SATA SMART, i.e. there is not so much info from these SAS disks than from a SATA disk.
What I see is for the SSDs I have, they report the wear between 0% and 2%. I consider this as good. One SSD has 30% wear.
One of the hard disks has 5 "Elements in grown defect list". And all disks have nonzero numbers for the "ECC recovered errors". However when I consider that I see that already some petabytes have been read from those disks, I can imagine that it will be unlikely that ECC recivered errors are zero, so I imagine this is normal. However, the "Uncorrectable Errors" is zero for all disks, which is good I think.
So I ask the question the other way round:
If the ECC recovered errors is nonzero, shall I worry or am I good to go to use these SAS SSDs and disks?
I have no idea if this very sparse SMART info is normal or if I just happen to have a "bad" controller (I got a Supermicro 3008-8i SAS controller card 12 GB/s). I am worried a bit about the 5 entries in the grown defect list, on the other hand Proxmox reports the disks as "healthy". And I will use ZFS anyways.
Also the 30% wear SSD I am not too worried about, as these SSDs can withstand multi petabytes. The workload in my server will not even be close to that, so I probably still can use them for the ZFS special device using a mirror config, 3-way mirror or similar.
so finally, I got my SAS controller and cables and finally I can test a couple disks I got.
So I have bought a couple used SAS SSDs cheaply. For example I got HGST S842 and some HUSSL4040. Very nice SSDs. I also have some HGST Ultrastar 14 TB hard disks. They will be handy when I will make my media zpool. I also got them used for very small $.
So I connected the drives and checked the SMART status. I already learned that SAS SMART is something completely different than SATA SMART, i.e. there is not so much info from these SAS disks than from a SATA disk.
What I see is for the SSDs I have, they report the wear between 0% and 2%. I consider this as good. One SSD has 30% wear.
One of the hard disks has 5 "Elements in grown defect list". And all disks have nonzero numbers for the "ECC recovered errors". However when I consider that I see that already some petabytes have been read from those disks, I can imagine that it will be unlikely that ECC recivered errors are zero, so I imagine this is normal. However, the "Uncorrectable Errors" is zero for all disks, which is good I think.
So I ask the question the other way round:
If the ECC recovered errors is nonzero, shall I worry or am I good to go to use these SAS SSDs and disks?
I have no idea if this very sparse SMART info is normal or if I just happen to have a "bad" controller (I got a Supermicro 3008-8i SAS controller card 12 GB/s). I am worried a bit about the 5 entries in the grown defect list, on the other hand Proxmox reports the disks as "healthy". And I will use ZFS anyways.
Also the 30% wear SSD I am not too worried about, as these SSDs can withstand multi petabytes. The workload in my server will not even be close to that, so I probably still can use them for the ZFS special device using a mirror config, 3-way mirror or similar.