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I did something similar on a smaller scale: "Caching" ssd drives which are not the best but have a huge amount write bytes left are widely available on ebay and

by consp 5y ago

I did something similar on a smaller scale: "Caching" ssd drives which are not the best but have a huge amount write bytes left are widely available on ebay and I bought 8 200GB SAS3 drives for dirt cheap (under 200$ total, drives from 2017). Not the fastest drives but good enough for my purpose (overkill even).

bullen 5y ago
What drives did you get?
- consp 5y ago
  Sun/oracle branded HGST SS300 drives (HUSMH4020ASS210), they have the specs in the ballpark of the SS800 drives in endurance (according to the scsi data pages from the disks) but read/write performance of the SS300.
  - bullen 5y ago
    Trying to google it it seems unclear to me what the product is... SSD or hybrid? Also what tech (SLC, MLC, TLC, QLC) and how many nm? This is the real reason why I went all in on the X25-E; there is no clear winner since 10 years... either it's super expensive and might be good or cheap and guaranteed crap! Also the interfaces are all over the place, PCIe, SAS, SATA, NVMe (which is PCIe?), M.2 with double PCIe?! with all kinds of connectors... We have a serious problem with storage of data when magnetic tape is still the real solution!
    - consp 5y ago
      MLC SSD, Sorry for being unclear, googling it is difficult as they were never released to non DC providers (these are custom for oracle) so data sheets are hard to get (I only have partial data, rest is from the sas inquiry and mode pages). You can deduce some of the specs from the name as they are the same for all hgst drives: HUS - hgst uktrastar standard MH - MLC high endurance (4PB is claimed for the 200GB drives, verified this by looking at the lifetime counter and the bytes written) 4020 - max spec 400gb, device is 200gb A - generation S - 2.5" formfactor S2 - 12GB/s (sas3), dual port 1 - probably means custom spec all my hgst former netapp/sun/oracle drives have this set to 1 both SSD and hdd 0 - crypto sanetize Haven't seen them a lot on eBay last month but caching drives with low percentage writes do show up from time to time in batches.
      - bullen 5y ago
        $25 per 200GB MLC used... I'd rather pay $100 per 64GB SLC unused.

by consp 5y ago

bullen 5y ago

What drives did you get?

consp 5y ago
Sun/oracle branded HGST SS300 drives (HUSMH4020ASS210), they have the specs in the ballpark of the SS800 drives in endurance (according to the scsi data pages from the disks) but read/write performance of the SS300.
- bullen 5y ago
  Trying to google it it seems unclear to me what the product is... SSD or hybrid? Also what tech (SLC, MLC, TLC, QLC) and how many nm? This is the real reason why I went all in on the X25-E; there is no clear winner since 10 years... either it's super expensive and might be good or cheap and guaranteed crap! Also the interfaces are all over the place, PCIe, SAS, SATA, NVMe (which is PCIe?), M.2 with double PCIe?! with all kinds of connectors... We have a serious problem with storage of data when magnetic tape is still the real solution!
  - consp 5y ago
    MLC SSD, Sorry for being unclear, googling it is difficult as they were never released to non DC providers (these are custom for oracle) so data sheets are hard to get (I only have partial data, rest is from the sas inquiry and mode pages). You can deduce some of the specs from the name as they are the same for all hgst drives: HUS - hgst uktrastar standard MH - MLC high endurance (4PB is claimed for the 200GB drives, verified this by looking at the lifetime counter and the bytes written) 4020 - max spec 400gb, device is 200gb A - generation S - 2.5" formfactor S2 - 12GB/s (sas3), dual port 1 - probably means custom spec all my hgst former netapp/sun/oracle drives have this set to 1 both SSD and hdd 0 - crypto sanetize Haven't seen them a lot on eBay last month but caching drives with low percentage writes do show up from time to time in batches.
    - bullen 5y ago
      $25 per 200GB MLC used... I'd rather pay $100 per 64GB SLC unused.