On 29.09.06 11:10, bbb wrote: > Subject: Does WD driver support MaxMultSect=16, and is it safe for a mysql > server?
> My WD driver `hdparm -i` shows thatt it support multiple sector I/O > and MaxMultSect=16. But the hdparm manual shows that the value can not > be set too large especially for WD driver, or it will corrupt the file > system. > > Does your drivers set the hdparm -m16 to speed up driver r/w > operations, especially when your driver is WD. Because I am running a > mysql service, and database r/w ability is very important. afaik multsect is only suported when DMA is not in use. DMA speeds up transfers much mode, so you should focus on it. > Some drives, however (most notably the WD Caviar series), seem to run > slower with multiple mode enabled. Your mileage may vary. Most drives > support the minimum settings of 2, 4, 8, or 16 (sectors). Larger settings > may also be possible, depending on the drive. A setting of 16 or 32 seems > optimal on many systems. Western Dig- ital recommends lower settings of 4 > to 8 on many of their drives, due tiny (32kB) drive buffers and > non-optimized buffer- ing algorithms. The -i flag can be used to find the > maximum setting supported by an installed drive (look for MaxMultSect in > the output). Some drives claim to support multiple mode, but lose data at > some settings. Under rare circumstances, such failures can result in > massive filesystem corruption. this is very old comment, (>5 years IIRC), and I'm not sure if it applies to newer drives. -- Matus UHLAR - fantomas, [EMAIL PROTECTED] ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. It's now safe to throw off your computer. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
