On each and every machine out there, and on every dmesg
output posted on numerous mailinglists, I see messages
similar to this:
scsi 0:0:0:0: Direct-Access ATA ST3250620NS 3.AE PQ: 0 ANSI: 5
SCSI device sda: 488397168 512-byte hdwr sectors (250059 MB)
SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO
or FUA
for SATA disk drives. And I wonder -- are those features
supported at all by linux, and/or are there disk drives
out there which supports it as well?
For my Seagate ST3250620NS SATA drive (it's a "server" drive,
whatever it means), I can see -- at least --
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
reported by hdparm -I. I wonder what "FLUSH CACHE EXT" means,
and whenever it can be used to support DPO and/or FUA...
Thanks.
/mjt
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