> We've generally used only SAS for our ZFS pools, and will continue to > do so. However, we're looking at adding some SSDs and those are almost > exclusively SATA. Do folks see issues mixing SATA SSDs as cache and > log devices in with SAS disk for hybrid storage pools?
I put my SAS drives in disk shelves (Sanima-SC/Newisys NDS-2240) and my cache in the system. My config uses an 9205-8e for the shelves, a 9211-8i for boot disk & L2ARC and an DDRdrive X1 for ZIL acceleration. In general, I write off non-LSI or non-Marvell on-board disk controllers. My current line of thinking is anything up to the SAS2008 chipset is probably too slow to fully a accommodate a system loaded with modern massively utilized SSDs and drive the storage portion of the pool well if you have a significant number of disks. A number of fully utilized SSDs can give disk controllers a solid run for their money -- forget about putting them behind RAID cards. The next spin of HP's raid controller is rumored to have a Nehalem processor on it so it can keep up with SSDs. On a side note, if you put most SSDs in the an HP p410 RAID, the system shuts down within a couple of minutes complaining about thermal overloads -- go figure. Likewise, if you put an LSI card into a DL380G7 and plug into the passive back plane it improperly detects the drive location and on occasion I believe it fully corrupted disks. While HP may be Solaris friendly, it doesn't seem to be 3rd party friendly. BTW, the Seagate Pulsar is SAS. I haven't had the pleasure of giving one a whirl yet. j.
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