Re: [zfs-discuss] SSD strange performance problem, resilvering helps during operation

2009-12-21 Thread Erik Trimble
Mart van Santen wrote: Hi, Do the I/O problems go away when only one of the SSDs is attached? No, the problem stays with only one SSD. The problem is only less when resilvering, but not totally disappeared (maybe because of the resilver overhead). The resilver is likely masking some under

Re: [zfs-discuss] SSD strange performance problem, resilvering helps during operation

2009-12-21 Thread Mart van Santen
Hi, Do the I/O problems go away when only one of the SSDs is attached? No, the problem stays with only one SSD. The problem is only less when resilvering, but not totally disappeared (maybe because of the resilver overhead). Frankly, I'm betting that your SSDs are wearing out. Resilver

Re: [zfs-discuss] SSD strange performance problem, resilvering helps during operation

2009-12-21 Thread Andrey Kuzmin
It might be helpful to contact SSD vendor, report the issue and inquire if half a year wearing out is expected behavior for this model. Further, if you have an option to replace one (or both) SSDs with fresh ones, this could tell for sure if they are the root cause. Regards, Andrey On Mon, Dec

Re: [zfs-discuss] SSD strange performance problem, resilvering helps during operation

2009-12-21 Thread Erik Trimble
Mart van Santen wrote: Hi, We have a X4150 with a J4400 attached. Configured with 2x32GB SSD's, in mirror configuration (ZIL) and 12x 500GB SATA disks. We are running this setup for over a half year now in production for NFS and iSCSI for a bunch of virtual machines (currently about 100 VM's

[zfs-discuss] SSD strange performance problem, resilvering helps during operation

2009-12-21 Thread Mart van Santen
Hi, We have a X4150 with a J4400 attached. Configured with 2x32GB SSD's, in mirror configuration (ZIL) and 12x 500GB SATA disks. We are running this setup for over a half year now in production for NFS and iSCSI for a bunch of virtual machines (currently about 100 VM's, Mostly Linux, some Wi