[zfs-discuss] iSCSI pool timeouts during high latency moments

2011-05-22 Thread Jim Klimov
Hi all, As I wrote before, I have a dpcool implemented as an iSCSI device stored in a volume of my physical pool. When there are many operations, such as attempts to destroy a dataset (which leads to many small IOs in my config), the iSCSI device is 100% busy for hours, latencies can grow to

Re: [zfs-discuss] iSCSI pool timeouts during high latency moments

2011-05-22 Thread Richard Elling
comment below... On May 22, 2011, at 8:31 AM, Jim Klimov wrote: Hi all, As I wrote before, I have a dpcool implemented as an iSCSI device stored in a volume of my physical pool. When there are many operations, such as attempts to destroy a dataset (which leads to many small IOs in my

Re: [zfs-discuss] iSCSI pool timeouts during high latency moments

2011-05-22 Thread Jim Klimov
2011-05-22 20:39, Richard Elling wrote: This means that the target closed the connection because there was already a task in progress. Likely this was the retry after the timeout. By default, these timeouts are quite long, so by now performance is already terrible. I'm not sure if you