Re: [zfs-discuss] Sequential vs Random I/O on array controller for ZFS usage

2007-10-25 Thread Victor Latushkin
Roch Bourbonnais wrote: > Le 21 oct. 07 à 02:40, Vincent Fox a écrit : > >> We had a Sun Engineer on-site recently who said this: >> >> We should set our array controllers to sequential I/O *even* if we >> are doing random I/O if we are using ZFS. >> This is because the Arc cache is already grou

Re: [zfs-discuss] Sequential vs Random I/O on array controller for

2007-10-24 Thread Vincent Fox
Thanks, we have switched over a couple of our arrays. Have not noticed a performance change so perhaps the effect is minor. Yes we are using ZFS to do the mirroring between the array LUNs and quite happy with it for reliability. As someone else said, speed and costs are metrics to look at but

Re: [zfs-discuss] Sequential vs Random I/O on array controller for ZFS usage

2007-10-23 Thread Roch Bourbonnais
Le 21 oct. 07 à 02:40, Vincent Fox a écrit : > We had a Sun Engineer on-site recently who said this: > > We should set our array controllers to sequential I/O *even* if we > are doing random I/O if we are using ZFS. > This is because the Arc cache is already grouping requests up > sequentiall

[zfs-discuss] Sequential vs Random I/O on array controller for ZFS usage

2007-10-20 Thread Vincent Fox
We had a Sun Engineer on-site recently who said this: We should set our array controllers to sequential I/O *even* if we are doing random I/O if we are using ZFS. This is because the Arc cache is already grouping requests up sequentially so to the array controller it will appear like sequenti