Hello!
I already have a topic on servethehome, but I said I'll ask here as well and maby get some more info.
So, we are rebuilding our OmniOS SAN and will build a HA cluster with the help of RSF-1 software. For us to be able to connect out JBODs to 2 controllers, we need a dual-port drives. No problem with hard drives, since most of the enterprise SAS hard drives are dual ported and most of them have same-same performance.
I'm currently stuck as selecting the right SSD for SLOG (according to zilstat, we need SLOG, since we have a lot of sync writes over iSCSI).
Currently my selection the following:
- HGST s842
- HGST SSD800MM
- Optimus Extreme SSDs
- Optimus Ultra/Ascend (same price as extreme, but more space and lower DWPD, so extreme is probably Ascend with a lot of overprovisioning?)
- Samsung SM1625 (can't find them anywhere but on their web page)
- Seagate S1200 SAS SSD (no info on DWPD)
- Toshiba PX02SSF010 ( how about these toshiba's? Are they any good?)
What do you use?
What do you recommend?
Why?
A few questions about sector size:
- should I go with 512b or 4k sector size hard drives?
- should I go with 512b or 4k sector size SSD SLOG drives?
- can I have 4k hard drives and 512b SSD SLOG?
- for hard drives, if I can choose 4k or 512e, what to pick?
- how much performance hit is there with 512e SSD drives, I know that with spindles, there is at least one plate turn, but since SSD don't have that....?
Thanks, Matej
I already have a topic on servethehome, but I said I'll ask here as well and maby get some more info.
So, we are rebuilding our OmniOS SAN and will build a HA cluster with the help of RSF-1 software. For us to be able to connect out JBODs to 2 controllers, we need a dual-port drives. No problem with hard drives, since most of the enterprise SAS hard drives are dual ported and most of them have same-same performance.
I'm currently stuck as selecting the right SSD for SLOG (according to zilstat, we need SLOG, since we have a lot of sync writes over iSCSI).
Currently my selection the following:
- HGST s842
- HGST SSD800MM
- Optimus Extreme SSDs
- Optimus Ultra/Ascend (same price as extreme, but more space and lower DWPD, so extreme is probably Ascend with a lot of overprovisioning?)
- Samsung SM1625 (can't find them anywhere but on their web page)
- Seagate S1200 SAS SSD (no info on DWPD)
- Toshiba PX02SSF010 ( how about these toshiba's? Are they any good?)
What do you use?
What do you recommend?
Why?
A few questions about sector size:
- should I go with 512b or 4k sector size hard drives?
- should I go with 512b or 4k sector size SSD SLOG drives?
- can I have 4k hard drives and 512b SSD SLOG?
- for hard drives, if I can choose 4k or 512e, what to pick?
- how much performance hit is there with 512e SSD drives, I know that with spindles, there is at least one plate turn, but since SSD don't have that....?
Thanks, Matej