On Thu, Dec 11, 2008 at 05:30:15PM -0500, Theodore Ts'o wrote:
> For SSD's and HDD's that use a 4k internal sector size, being 4k aligned
QLogic Fibre Channel HBA Driver: 8.01.02-d4
QLogic QLA2342 - 133MHz PCI-X to 2Gb FC, Dual Channel
ISP2312: PCI-X (133 MHz) @ 0000:04:04.0 hdma+, host#=2, fw=3.03.18 IPX
Vendor: DDN Model: S2A 8500 Rev: 5.20
Type: Direct-Access ANSI SCSI revision: 03
qla2300 0000:04:04.0: scsi(2:0:0:1): Enabled tagged queuing, queue depth 32.
SCSI device sdb: 1073741824 4096-byte hdwr sectors (4398047 MB)
Is it example of 4K hw?
> makes a big difference because it avoids read-modify-write cycles. We
> can achieve this easily if we simply use a CHS geometry of 56
> sectors/track instead of 63 sectors. So, I would propose that we change
> the default geometry used by the partitioning tools in util-linux-ng,
fdisk(8) in RHEL already supports
fdisk -b 4096
otherwise fdisk follows BLKSSZGET ioctl. The upstream fdisk supports
"-b {512,1024,2048}" now.
> Does this make sense? Am I missing some fatal flaw?
I have the same questions :-) ... it's difficult without a real
experience and the HW.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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