I am attempting to kill two birds with one stone on this thread -
I ended up with a D2616 (based on the SAS 2108) which has 512mb cache after a server screwup. Stupidly I thought the cache would be a good idea so I put all 7 drives onto it and shoved it into the server. Used the (painful) MegaRAID BIOS thing to get the thing to boot and yeah. The current setup is having everything as RAID0 volumes. Not too bad since SMART data passes through -
However, I have no idea what is going on but this setup decides to sometimes write at 100MB/s, then 50MB/s and then drop to 0B/s - for example, writing to a WD Green 2TB starts off 100MB/s and then decides to just drop 40MB/s (on a totally solid archive file). Sometimes, it just tells me that an 'unspecified error is keeping me from copying this file'.
Everything is set to off - cache is disabled on ALL logical volumes because I don't have a UPS yet and whilst power outages are rare (once a year or something), I can't risk it.
All in all, is this a limitation of using a RAID card like the D2616 (which has to be used IR with Fujitsu firmware and everything RAID0)? Would I be better off switching to a SAS9201-8i? (The 8i is the most basic non-cache pre-IT flashed card)
Cheers
I ended up with a D2616 (based on the SAS 2108) which has 512mb cache after a server screwup. Stupidly I thought the cache would be a good idea so I put all 7 drives onto it and shoved it into the server. Used the (painful) MegaRAID BIOS thing to get the thing to boot and yeah. The current setup is having everything as RAID0 volumes. Not too bad since SMART data passes through -
However, I have no idea what is going on but this setup decides to sometimes write at 100MB/s, then 50MB/s and then drop to 0B/s - for example, writing to a WD Green 2TB starts off 100MB/s and then decides to just drop 40MB/s (on a totally solid archive file). Sometimes, it just tells me that an 'unspecified error is keeping me from copying this file'.
Everything is set to off - cache is disabled on ALL logical volumes because I don't have a UPS yet and whilst power outages are rare (once a year or something), I can't risk it.
All in all, is this a limitation of using a RAID card like the D2616 (which has to be used IR with Fujitsu firmware and everything RAID0)? Would I be better off switching to a SAS9201-8i? (The 8i is the most basic non-cache pre-IT flashed card)
Cheers