----- "Brian" <broco...@vt.edu> skrev: > (1) They seem to have a firmware setting (that may not be modified > depending on revision) that has to do with the drive "parking" the > drive after 8 seconds of inactivity to save power. These drives are > rated for a certain number of park/unpark operations -- I think > 300,000. Using these drives in a NAS results in a lot of > park/unpark.
8 seconds? is it really that low? > (2) They are big and slow. This seems to be a very bad combination > for RAIDZ(n). I have seen people report resilvering times of 2 to 4 > days. I am not sure how much that impact performance. But that can > be a long time to run in a degraded state for some people. I don't > know how the resilvering process works - so I don't know if it is a > ZFS issue or not.. Regardless of the drive speed it seems like more > than 2 days to write 1 to 2 TB worth of data is ridiculous - but no > one seems to complain that it is ZFS's fault - so there must be a lot > involved in resilvering that I don't understand. I think that small > and slow would be OK - if you had 500GB green drives you might be > fine.. But people tend to look at the green drives because they have > so much capacity for the money - so I haven't seen anyone say that a > Green 500GB drives work well. We have a green array of 3x7 2TB drives in raidz2 (27TiB), almost full, and it takes some two and a half days to scrub it. Does anyone have scrub times for similar setups with, say, Black drives? > (3) They seem to have a lot of platters.. 3 or 4. More platters == > more heat == more failure... apparently. I somehow doubt Black drives have less platters 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
