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#1
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Should I use a 1x or 4x SAS cable?
I'm installing SATA drives in an external SAS enclosure. The
enclosure is connected to a LSI Logic MegaRAID 8888ELP RAID card. My question is, what advantage will a 4x SAS cable connecting the RAID card to the enclosure give me over a 1x cable? And does it matter that the drives are SATA vs. SAS? Thanks, Ryan |
#2
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Should I use a 1x or 4x SAS cable?
On Jun 13, 12:48 pm, Ryan408 wrote:
I'm installing SATA drives in an external SAS enclosure. The enclosure is connected to a LSI Logic MegaRAID 8888ELP RAID card. My question is, what advantage will a 4x SAS cable connecting the RAID card to the enclosure give me over a 1x cable? And does it matter that the drives are SATA vs. SAS? Although connecting a SATA drive to a SAS enclosure will work, you won't get the benefits of a SAS drive. SATA drives are typically bigger but slower (and cheaper). They can't read and write at the same time - the SATA bus is unidirectional. Although I haven't tested this, I believe that a 4x cable will not give you any benefit over a 1x cable - SATA is only 1-phy. .../Ed -- Ed Wilts, Mounds View, MN, USA RHCE, BCFP, BCSD, SCSP, SCSE If I've helped you, please make a donation to my favorite charity at http://firstgiving.com/edwilts |
#3
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Should I use a 1x or 4x SAS cable?
Although I haven't tested
this, I believe that a 4x cable will not give you any benefit over a 1x cable - SATA is only 1-phy. SATA drives are single-ported, while some SAS drives are dual-ported. However, there are no quad-port SAS drives so why the 4x cable? I don't think the correlation is between SAS lanes and ports on the drive. Ryan |
#4
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Should I use a 1x or 4x SAS cable?
Ryan408 wrote:
Although I haven't tested this, I believe that a 4x cable will not give you any benefit over a 1x cable - SATA is only 1-phy. SATA drives are single-ported, while some SAS drives are dual-ported. However, there are no quad-port SAS drives so why the 4x cable? To provide a separate SATA channel to each drive? With a 1x cable wouldn't I/O requests for all four drives have to share the same link. -- Nik Simpson |
#5
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Should I use a 1x or 4x SAS cable?
On Jun 13, 1:09*pm, nik Simpson wrote:
Ryan408 wrote: * Although I haven't tested this, I believe that a 4x cable will not give you any benefit over a 1x cable - SATA is only 1-phy. SATA drives are single-ported, while some SAS drives are dual-ported. However, there are no quad-port SAS drives so why the 4x cable? To provide a separate SATA channel to each drive? With a 1x cable wouldn't I/O requests for all four drives have to share the same link. -- Nik Simpson A well designed controller should be able to do exactly that. Each port should be able to concurrently talk to a separate disk drive. I have no idea if the LSI card mentioned above does that though. Maybe someone else knows. Dave |
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