Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
and saw it *wouldn't* go beyond 8MB/s (sorry typo) On Thu, Jun 19, 2008 at 9:28 PM, Marcelo Azevedo <marzevd at gmail.com> wrote: > After placing the metadata on a different spindle (HD) , i was able to > reach almost close to native speed (1-2MB/s less) > > with metadata internal i was reaching tops around half of the native speed > , 37MB/s~ : > physical partition -> drbd -> ext3 > and > 63MB/s~ with physical partition -> ext3 > 61MB/s with metadata external, now this is true for another strong > machine . > > This other machine has hardware RAID1 with two : > Cheetah T10 series, > 146GB ,Serial Attached SCSI > Interface Speed: 3Gb/s > Spindle Rotation Speed: 15,000 RPM > Performance: 10K > on an IBM 2G Xeon server with 2 dual cpu packages , each cpu with 4 cores . > *IBM ServeRAID* SCSI controllers<http://publib.boulder.ibm.com/infocenter/eserver/v1r2/topic/diricinfo/fqy0_cibmraid.html> > 4GB of ram > native speed -hardware raid1 -> physical partition -> ext3 is around > 110MB/s ( still isn't this a bit slow for this HD ? ) > hardware raid1 -> physical partition -> drbd -> ext3 - 101MB/s with > external metadata on a USB2 connected SATA HD 7,200 rpm > > now this is the crazy part - 8.3MB/s~ write speed ! with internal metadata > , and 150MB/s read speed.. > this test was repeated with bonnie , iozone and dd , all showed around same > numbers , > i mean why the huge jump from 8MB/s to 100MB/s when using external metadata > , and should this be STRESSED on the Docs or when starting the program that > putting the metadata on external media improves performance significantly? > , still i don't understand why i was able to reach only 8MB/s write speed on > this strong server , maybe because of the hardware raid1 underneath? > > > kernel reports for the raid controller : > Adaptec aacraid driver 1.1-5[2437]-mh4 > ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 17 (level, low) -> IRQ 16 > PCI: Setting latency timer of device 0000:04:00.0 to 64 > AAC0: kernel 5.2-0[15411] Oct 11 2007 > AAC0: monitor 5.2-0[15411] > AAC0: bios 5.2-0[15411] > AAC0: serial 402A183 > AAC0: 64bit support enabled. > AAC0: 64 Bit DAC enabled > scsi0 : ServeRAID > Vendor: ServeRA Model: system Rev: V1.0 > Type: Direct-Access ANSI SCSI revision: 02 > drbd ver 8.2.6 (api:86/proto:86-88) > > at first i thought it was network performance issue , i benchmarked with > ipref and reached 990Mbit gigabit speed, then i monitored the line with > iptraf and saw 14MB/s tops writing speed on the drbd drive , and 50MB/s > tops when doing synchronization > > so i tried on standalone mode , and saw it would go beyond 8MB/s with the > benchmark tools , so it clearly wasn't a network issue > > Marcelo. > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20080619/6dd073a6/attachment.htm>