Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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-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 Oct 11 2007 AAC0: monitor 5.2-0 AAC0: bios 5.2-0 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/20080619/1f1b9b35/attachment.htm>