Ric Wheeler <rwheeler@xxxxxxxxxx> writes: >>> Just to add some support to this, all of the external RAID arrays that >>> I know of normally run with write cache disabled on the component >>> drives. >> >> Do they use "off the shelf" SATA (or PATA) disks, and if so, which ones? > > Which drives various vendors ships changes with specific products. > Usually, they ship drives that have carefully vetted firmware, etc. > but they are close to the same drives you buy on the open market. But they aren't the same, are they? If they are not, the fact they can run well with the write-through cache doesn't mean the off-the-shelf ones can do as well. Are they SATA (or PATA) at all? SCSI etc. are usually different animals, though there are SCSI and SATA models which differ only in electronics. Do you have battery-backed write-back RAID cache (which acknowledges flushes before the data is written out to disks)? PC can't do that. -- Krzysztof Halasa -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
