> >The best would be to export the drives in JBOD style, one "array" per > >drive. If you rely on the Promise RAID, it you won't be able to > >recover from "silent" errors. I'm in the progress of moving from a > >NexSAN RAID to a JBOD-like style just because of that (we had data > >>corruption on the RAID, stuff the NexSAN box didn't detect, as the > >drives didn't detect it). As this NexSAN box can't export true JBOD, > >I export each pair of drives as a stripe, and use them in VDEVs in > >RAIDz2s and a spare or two. While not as good as local drives, it'll > >be >better than trusting the 'hardware' RAID on the box (which has > >proven to be unable to detect silent errors). > > Yup, we just did the same thing with our PAC storage units. Created 48 > Raid 0 stripes with 1 drive each. We originally tried 4 drives per > Raid 0 stripe but we ran into massive performance hits.
In case someone gets across NexSAN SATABOY boxes, keep in mind that they can neither do JBOD nor make more than 14 RAID sets. I ended up exporting three drives for each RAID-0 set and then used RAIDz2 across them together with a spare. Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 r...@karlsbakk.net http://blogg.karlsbakk.net/ -- I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
